Php7 tutorial

PHP 7
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AbouttheTutorial
PHP 7 is the most awaited and is a major feature release of PHP programming language.
PHP 7 was released on 3rd
Dec 2015.
This tutorial will teach you the new features of PHP 7 and their usage in a simple and
intuitive way.
Audience
This tutorial has been prepared for PHP developers from a beginner’s point of view. After
completing this tutorial, you will find yourself at a moderate level of expertise in the
knowledge of PHP from where you can take yourself to next levels.
Prerequisites
We assume that you already know about the older versions of PHP and now you can start
learning the new features of PHP 7.
ExecutePHP-7Online
For most of the examples given in this tutorial, you will find an option Try it. Just use this
option to execute your PHP-7 programs at the spot and enjoy your learning.
Try the following example using Try it option available at the top right corner of the below
sample code box −
<html>
<head>
<title>Online PHP-7 Script Execution</title>
</head>
<body>
<?php
echo "<h1>Hello, PHP-7!</h1>";
?>
</body>
</html>

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Copyright&Disclaimer
 Copyright 2016 by Tutorials Point (I) Pvt. Ltd.
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Pvt. Ltd. The user of this e-book is prohibited to reuse, retain, copy, distribute or republish
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of the publisher.
We strive to update the contents of our website and tutorials as timely and as precisely as
possible, however, the contents may contain inaccuracies or errors. Tutorials Point (I) Pvt.
Ltd. provides no guarantee regarding the accuracy, timeliness or completeness of our
website or its contents including this tutorial. If you discover any errors on our website or
in this tutorial, please notify us at contact@tutorialspoint.com

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TableofContents
About the Tutorial ............................................................................................................................................i
Audience...........................................................................................................................................................i
Prerequisites.....................................................................................................................................................i
Execute PHP-7 Online.......................................................................................................................................i
Copyright & Disclaimer.................................................................................................................................... ii
Table of Contents ........................................................................................................................................... iii
1. PHP 7 – Introduction.................................................................................................................................1
What is PHP 7? ................................................................................................................................................1
New Features...................................................................................................................................................1
2. PHP 7 – Performance ................................................................................................................................3
Magento 1.9 ....................................................................................................................................................3
Drupal 7...........................................................................................................................................................4
Wordpress 3.6 .................................................................................................................................................4
Comparison of Dynamic Languages.................................................................................................................5
3. PHP 7 – Environment Setup ......................................................................................................................6
Try it Option Online.........................................................................................................................................6
PHP Parser Installation ....................................................................................................................................7
Installation on Linux/Unix................................................................................................................................7
Installation on Mac OS X................................................................................................................................10
Installation on Windows with IIS...................................................................................................................11
Installation on Windows with Apache...........................................................................................................12
Apache Configuration....................................................................................................................................13
PHP Configuration in Apache ........................................................................................................................13
PHP.INI File Configuration .............................................................................................................................14
PHP.INI Configuration....................................................................................................................................14
Windows IIS Configuration............................................................................................................................18
4. PHP 7 – Scalar Type Declarations ............................................................................................................19
Example – Coercive Mode.............................................................................................................................19
5. PHP 7 – Return Type Declarations...........................................................................................................21
Example - Valid Return Type .........................................................................................................................21
Example - Invalid Return Type.......................................................................................................................21
6. PHP 7 – Null Coalescing Operator............................................................................................................23
7. PHP 7 – Spaceship Operator....................................................................................................................24
8. PHP 7 – Constant Arrays .........................................................................................................................26
9. PHP 7 – Anonymous Classes....................................................................................................................27
10. PHP 7 – Closure::call() .............................................................................................................................28
Example – Pre PHP 7......................................................................................................................................28
Example – PHP 7+..........................................................................................................................................28

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11. PHP 7 – Filtered unserialize() ..................................................................................................................30
12. PHP 7 – IntlChar ......................................................................................................................................32
13. PHP 7 – CSPRNG......................................................................................................................................33
random_bytes().............................................................................................................................................33
random_int() .................................................................................................................................................34
14. PHP 7 – Expectations...............................................................................................................................35
Configuration directives for assert()..............................................................................................................35
15. PHP 7 – use Statement............................................................................................................................37
16. PHP 7 – Error Handling............................................................................................................................38
17. PHP 7 – Integer Division..........................................................................................................................40
18. PHP 7 – Session Options..........................................................................................................................41
19. PHP 7 – Deprecated Features..................................................................................................................42
PHP 4 Style Constructors...............................................................................................................................42
Static Calls to Non-Static Methods................................................................................................................42
password_hash() salt option .........................................................................................................................43
capture_session_meta SSL context option ...................................................................................................43
20. PHP 7 – Removed Extensions & SAPIs .....................................................................................................44

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WhatisPHP7?
PHP 7 is a major release of PHP programming language and is touted to be a revolution in the
way web applications can be developed and delivered for mobile to enterprises and the cloud.
This release is considered to be the most important change for PHP after the release of PHP
5 in 2004.
New Features
There are dozens of features added to PHP 7, the most significant ones are mentioned below
-
 Improved performance - Having PHPNG code merged in PHP7, it is twice as fast as
PHP 5.
 Lower Memory Consumption - Optimized PHP 7 utilizes lesser resource.
 Scalar type declarations - Now parameter and return types can be enforced.
 Consistent 64-bit support - Consistent support for 64-bit architecture machines.
 Improved Exception hierarchy - Exception hierarchy is improved.
 Many fatal errors converted to Exceptions - Range of exceptions is increased
covering many fatal error converted as exceptions.
 Secure random number generator - Addition of new secure random number
generator API.
 Deprecated SAPIs and extensions removed - Various old and unsupported SAPIs
and extensions are removed from the latest version.
 The null coalescing operator (??) - New null coalescing operator added.
 Return and Scalar Type Declarations - Support for return type and parameter type
added.
 Anonymous Classes - Support for anonymous added.
1. PHP 7 – INTRODUCTION

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 Zero cost asserts - Support for zero cost assert added.
PHP 7 uses new Zend Engine 3.0 to improve application performance almost twice and 50%
better memory consumption than PHP 5.6. It allows to serve more concurrent users without
requiring any additional hardware. PHP 7 is designed and refactored considering today's
workloads.

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As per the Zend team, following illustrations show the performance comparison of PHP 7 vs
PHP 5.6 and HHVM 3.7 on popular PHP based applications.
Magento1.9
PHP 7 proves itself more than twice as faster, as compared to PHP 5.6 while executing
Magento transactions.
2. PHP 7 – PERFORMANCE

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Drupal7
PHP 7 proves itself more than twice as faster, as compared to PHP 5.6 while executing Drupal
transactions.
Wordpress3.6
PHP 7 proves itself more than twice as faster as compared to PHP 5.6 while executing
Wordpress transactions.

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ComparisonofDynamicLanguages

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TryitOptionOnline
We have set up the PHP Programming environment on-line, so that you can compile and
execute all the available examples online. It gives you confidence in what you are reading
and enables you to verify the programs with different options. Feel free to modify any example
and execute it online.
Try the following example using our online compiler available at CodingGround.
<html>
<head>
<title>Online PHP Script Execution</title>
</head>
<body>
<?php
echo "<h1>Hello, PHP!</h1>";
?>
</body>
</html>
For most of the examples given in this tutorial, you will find a Try it option in our website
code sections at the top right corner that will take you to the online compiler. So just use of
and enjoy your learning.
In order to develop and run PHP Web pages, three vital components need to be installed on
your computer system.
 Web Server − PHP works with virtually all Web Server software, including Microsoft's
Internet Information Server (IIS) but most often used is Apache Server. Download
Apache for free here − http://httpd.apache.org/download.cgi
 Database − PHP works with virtually all database software, including Oracle and
Sybase but most commonly used is MySQL database. Download MySQL for free here
−http://www.mysql.com/downloads/
3. PHP 7 – ENVIRONMENT SETUP

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 PHP Parser − In order to process PHP script instructions, a parser must be installed
to generate HTML output that can be sent to the Web Browser. This tutorial will guide
you how to install PHP parser on your computer.
PHPParserInstallation
Before you proceed, it is important to make sure that you have proper environment setup on
your machine to develop your web programs using PHP. Store the following php file in
Apache's htdocs folder.
phpinfo.php
<?php
phpinfo();
?>
Type the following address into your browser's address box.
http://127.0.0.1/phpinfo.php
If this displays a page showing your PHP installation related information, then it means you
have PHP and Webserver installed properly. Otherwise, you have to follow the given procedure
to install PHP on your computer.
This section will guide you to install and configure PHP over the following four platforms −
 PHP Installation on Linux or Unix with Apache
 PHP Installation on Mac OS X with Apache
 PHP Installation on Windows NT/2000/XP with IIS
 PHP Installation on Windows NT/2000/XP with Apache
InstallationonLinux/Unix
If you plan to install PHP on Linux or any other variant of Unix, then here is the list of
prerequisites −
 The PHP source distribution http://www.php.net/downloads.php
 The latest Apache source distribution http://httpd.apache.org/download.cgi
 A working PHP-supported database, if you plan to use one (For example MySQL, Oracle
etc.)
 Any other supported software, to which PHP must connect (mail server, BCMath
package, JDK, and so forth)

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 An ANSI C compiler.
 Gnu make utility − you can freely download it at http://www.gnu.org/software/make
Now, here are the steps to install Apache and PHP5 on your Linux or Unix machine. If your
PHP or Apache versions are different then please take care accordingly.
Step 1
If you have not already done so, unzip and untar your Apache source distribution. Unless you
have a reason to do otherwise, /usr/local is the standard place.
gunzip -c apache_2.4.x.tar.gz
tar -xvf apache_2.4.x.tar
Step 2
Build the apache Server as follows -
cd apache_2.4.x
./configure --prefix=/usr/local/apache --enable-so
make
make install
Step 3
Unzip and untar your PHP source distribution. Unless you have a reason to do otherwise,
/usr/local is the standard place.
gunzip -c php-7.x.tar.gz
tar -xvf php-7.x.tar
cd php-7.x
Step 4
Configure and Build your PHP, assuming you are using MySQL database.
./configure --with-apxs=/usr/sbin/apxs

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--with-mysql=/usr/bin/mysql
make
make install
Step 5
Install the php.ini file. Edit this file to get configuration directives −
cd ../../php-7.x
cp php.ini-development /usr/local/lib/php.ini
Step 6
 Tell your Apache server where you want to serve files from, and what extension(s)
you want to identify PHP files. A .php extension is standard, but you can use .html,
.phtml, or whatever you want.
o Go to your HTTP configuration files (/usr/local/apache/conf or whatever your
path is).
o Open httpd.conf with a text editor.
o Search for the word DocumentRoot (which should appear twice), and change
both the paths to the directory you want to serve files out of (in our case,
/home/httpd). We recommend a home directory rather than the default
/usr/local/apache/htdocs because it is more secure, but it does not have
to be in a home directory. You will keep all your PHP files in this directory.
 Add at least one PHP extension directive, as shown in the first line of the code that
follows. In the second line, we have also added a second handler to have all HTML files
parsed as PHP.
AddType application/x-httpd-php .php
AddType application/x-httpd-php .html
Step 7
Restart your server. Every time you change your HTTP configuration or php.ini files, you must
stop and start your server again.
cd ../bin
./apachectl start

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Step 8
Set the documentroot-directory permissions to world-executable. The actual PHP files in the
directory need only be world-readable (644). If necessary, replace /home/httpd with your
document root below −
chmod 755 /home/httpd/html/php
Step 9
Open a text editor. Type: <?php phpinfo(); ?>. Save this file in your Web server's document
root as info.php. Start any Web browser and browse the file. You must always use an HTTP
request (http://www.testdomain.com/info.php or http://localhost/info.php or
http://127.0.0.1/info.php) rather than a filename (/home/httpd/info.php) for the file to be
parsed correctly.
You will see a long table of information about your new PHP installation message
Congratulations!
InstallationonMacOSX
Mac users have a choice of either a binary or a source installation. In fact, your OS X probably
came with Apache and PHP preinstalled. This is likely to be quite an old build, and it probably
lacks many of the less common extensions.
However, if all you want is a quick Apache + PHP + MySQL/PostgreSQL setup on your laptop,
this is certainly the easiest way to fly. All you need to do is edit your Apache configuration file
and turn on the Web server.
Just follow the steps given below−
Step 1
Open the Apache config file in a text editor as root.
sudo open -a TextEdit /etc/httpd/httpd.conf
Step 2
Edit the file. Uncomment the following lines −
Load Module php7_module
AddModule mod_php7.c

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Step 3
You may also want to uncomment the <Directory /home/*/Sites> block or otherwise tell
Apache which directory to serve. Restart the Web server.
sudo apachectl graceful
Step 4
parsed correctly.
Congratulations!
InstallationonWindowswithIIS
The Windows server installation of PHP running IIS is much simpler than on Unix, since it
involves a precompiled binary rather than a source build.
If you plan to install PHP over Windows, then here is the list of prerequisites −
 A working PHP-supported Web server. Under previous versions of PHP, IIS/PWS was
the easiest choice because a module version of PHP was available for it; but PHP now
has added a much wider selection of modules for Windows.
 A correctly installed PHP-supported database like MySQL or Oracle etc. (if you plan to
use one).
 The PHP Windows binary distribution (download it at www.php.net/downloads.php)
 A utility to unzip files (search http://download.cnet.com for PC file compression
utilities)
Now here are the steps to install Apache and PHP5 on your Windows machine. If your PHP
version is different, then please take care accordingly.
1. Extract the binary archive using your unzip utility; C:PHP is a common location.
2. Copy some .dll files from your PHP directory to your systems directory (usually
C:WinntSystem32). You need php5ts.dll for every case. You will also probably need
to copy the file corresponding to your Web server module - C:PHPSapiphp7isapi.dll.
It is possible you will also need other files from the dlls subfolder, but start with the
two files mentioned above and add more if you need them.

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3. Copy either the php.ini-development or php.ini-recommended (preferably the latter)
to your Windows directory (C:Winnt or C:Winnt40), and rename it php.ini. Open this
file in a text editor (for example, Notepad). Edit this file to get the configuration
directives. We highly recommend the new users to set error-reporting to E_ALL on
their development machines at this point. For now, the most important thing is the
doc_root directive under the Paths and Directories section. Make sure this matches the
IIS Inetpub folder (or wherever you plan to serve out of).
4. Stop and restart the WWW service. Go to the Start menu → Settings → Control
Panel → Services. Scroll down the list to IIS Admin Service. Select it and click Stop.
After it stops, select the World Wide Web Publishing Service and click Start. Stopping
and restarting the service from within the Internet Service Manager will not suffice.
Since this is Windows, you may also wish to reboot.
5. Open a text editor. Type: <?php phpinfo(); ?>. Save this file in your Web server's
document root as info.php.
6. Start any Web browser and browse the file. You must always use an HTTP request
(http://www.testdomain.com/info.php or http://localhost/info.php or
http://127.0.0.1/info.php) rather than a filename (/home/httpd/info.php) for the file
to be parsed correctly.
Congratulations!
InstallationonWindowswithApache
To install Apache with PHP 5 on Windows, follow the given steps. If your PHP and Apache
versions are different then please take care accordingly.
Step 1
 Download Apache server from www.apache.org/dist/httpd/binaries/win32. You want
the current stable release version with the no_src.msi extension. Double-click the
installer file to install; C:Program Files is a common location. The installer will also
ask you whether you want to run Apache as a service or from the command line or
DOS prompt. We recommend you do not install as a service, as this may cause
problems with startup.
 Extract the PHP binary archive using your unzip utility; C:php7 is a common location.
 Rename php.ini-development to php.ini. Open this file in a text editor (for example,
Notepad). Edit this file to get the configuration directives. At this point, we highly
recommend that the new users set error reporting to E_ALL on their development
machines.

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 Tell your Apache server where you want to serve files from and what extension(s) you
want to identify the PHP files (.php is the standard, but you can use .html, .phtml, or
whatever you want). Go to your HTTP configuration files (C:Program FilesApache
GroupApacheconf or whatever your path is), and open httpd.conf with a text editor.
Search for the word DocumentRoot (which should appear twice) and change both the
paths to the directory you want to serve files out of. (The default is C:Program
FilesApache GroupApachehtdocs.). Add at least one PHP extension directive as
shown in the first line of the following code −
AddHandler application/x-httpd-php .php
AddType application/x-httpd-php .php .html
LoadModule php7_module "C:/php7/php7apache2_4.dll"
PHPiniDir "c:/php7"
Step 2
parsed correctly.
Congratulations!
ApacheConfiguration
If you are using Apache as a Web Server, then this section will guide you to edit Apache
Configuration Files.
Check here − PHP Configuration in Apache Server
PHPConfigurationinApache
Apache uses httpd.conf file for global settings, and the .htaccess file for per-directory access
settings. Older versions of Apache split up httpd.conf into three files (access.conf, httpd.conf,
and srm.conf), and some users still prefer this arrangement.
Apache server has a very powerful, but slightly complex, configuration system of its own.
Learn more about it at the Apache Web site − www.apache.org
The following section describes the settings in httpd.conf that affect PHP directly and cannot
be set elsewhere. If you have standard installation then httpd.conf will be found at
/etc/httpd/conf:

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Timeout
This value sets the default number of seconds before any HTTP request will time out. If you
set PHP's max_execution_time to longer than this value, PHP will keep grinding away but the
user may see a 404 error. In safe mode, this value will be ignored; instead, you must use the
timeout value in php.ini.
DocumentRoot
DocumentRoot designates the root directory for all HTTP processes on that server. It looks
something like this on Unix −
DocumentRoot ./usr/local/apache_2.4.0/htdocs.
You can choose any directory as the document root.
AddType
The PHP MIME type needs to be set here for PHP files to be parsed. Remember that you can
associate any file extension with PHP like .php3, .php5 or .htm.
AddType application/x-httpd-phps .phps
AddType application/x-httpd-php3 .php3 .phtml
AddType application/x-httpd-php .html
Action
You must uncomment this line for the Windows apxs module version of Apache with shared
object support −
LoadModule php7_module modules/php7apache2_4.dll
on Unix flavors −
LoadModule php7_module modules/mod_php.so
AddModule
You must uncomment this line for the static module version of Apache.
AddModule mod_php7.c

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PHP.INIFileConfiguration
The PHP configuration file, php.ini, is the final and immediate way to affect PHP's
functionality.
Check here − PHP.INI File Configuration
PHP.INIConfiguration
The PHP configuration file, php.ini, is the final and immediate way to affect PHP's functionality.
The php.ini file is read each time PHP is initialized. In other words, httpd is restarted for the
module version or with each script execution for the CGI version. If your change is not showing
up, remember to stop and restart httpd. If it is still not showing up, use phpinfo() to check
the path to php.ini.
The configuration file is well commented and thorough. Keys are case sensitive, keyword
values are not; whitespace, and lines beginning with semicolons are ignored. Booleans can
be represented by 1/0, Yes/No, On/Off, or True/False. The default values in php.ini-dist will
result in a reasonable PHP installation that can be tweaked later.
Here we are explaining the important settings in php.ini, which you may need for your PHP
Parser.
short_open_tag = Off
Short open tags look like this: <? ?>. This option must be set to Off, if you want to use the
XML functions.
safe_mode = Off
If this is set to ON, you probably compiled PHP with the --enable-safe-mode flag. The Safe
mode is most relevant to CGI use. See the explanation in the section "CGI compile-time
options" given earlier in this chapter.
safe_mode_exec_dir = [DIR]
This option is relevant only if the safe mode is ON; it can also be set with the --with-exec-dir
flag during the Unix build process.

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