02 Php Vars Op Control Etc
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The document discusses various PHP programming concepts like variables, data types, operators, control structures, and functions. It provides code examples to demonstrate how to work with variables, different data types, operators, conditional statements, loops, and functions in PHP. Various PHP concepts covered include strings, arrays, objects, constants, arithmetic operators, comparison operators, if/else statements, switch statements, while loops, for loops, and functions.
![Variable in PHP String: A string is series of characters. In PHP, a character is the same as a byte, that is, there are exactly 256 different characters possible. Array: An array in PHP is actually an ordered map. A map is a type that maps values to keys . $names[1] = “Ram”; $names[2] = “Shyam”;](https://image.slidesharecdn.com/02phpvarsopcontroletc-090627075509-phpapp01/85/02-Php-Vars-Op-Control-Etc-3-320.jpg)
02 Php Vars Op Control Etc
- 1. Day 2 PHP Geshan Manandhar Developer, Young Innovations Pvt. Limited www.geshanmanandhar.com http://www.php.net
- 2. Variables in PHP Boolean: It can be either TRUE or FALSE . Integer: The size of an integer is platform-dependent, although a maximum value of about two billion is the usual value. Float: The size of a float is platform-dependent, although a maximum of ~1.8e308 with a precision of roughly 14 decimal digits is a common value
- 3. Variable in PHP String: A string is series of characters. In PHP, a character is the same as a byte, that is, there are exactly 256 different characters possible. Array: An array in PHP is actually an ordered map. A map is a type that maps values to keys . $names[1] = “Ram”; $names[2] = “Shyam”;
- 4. Variables in PHP Objects: mainly have attributes and functions. <?php class test { function do_test() { echo "Testing class function."; } } $an_object = new test; $an_object->do_test(); ?>
- 5. Naming variables in PHP Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive. A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. $a_5=10; //valid $#b = 20; //invalid Predefined Variables ($_SERVER, $_POST)
- 6. Constant You can define a constant by using the define() -function. Once a constant is defined, it can never be changed or undefined. <?php define("PI", 3.1415); //defining a constant called PI $r=5; //r for radius $area = PI*$r*$r; //area calculation of circle print "Areas of circle with radius $r is ".$area."."; //user number_format() yourself. ?>
- 7. Arithmetic Operators See Program for more clarification: Day02\prog06_Operators.php
- 8. Comparison Operators See code of Day02\prog08_comparision_operators.php
- 9. Increment Decrement Operators ++ and -- Code at Day02\prog09_inc_dec_operator.php
- 10. Logical Operator
- 11. String Operator . used to concatenate strings .= used to append a string. <?php $b = ”Hello” . "World!"; // now $b contains "Hello World!" $a = "Hello "; $a .= "World!"; // now $a contains "Hello World!" ?>
- 12. If-else if- else <?php $a=10; $b=17; if ($a > $b) { echo "a is bigger than b"; } elseif ($a == $b) { echo "a is equal to b"; } else { echo "a is smaller than b"; } ?>
- 13. If-else if- else alternate <?php $a=10; $b=17; if ($a > $b) : echo "a is bigger than b"; elseif ($a == $b) : echo "a is equal to b"; else : echo "a is smaller than b"; endif; ?>
- 14. Switch Example <?php $engDay =date ("l"); switch ($engDay) { case "Friday"; print "Thank god its Friday"; break; case "Saturday"; print "Oh its week end Saturday"; break; default: print "Its just another working day of the week."; } ?>
- 15. While Loop <?php $i = 1; while ($i <= 10) { echo $i++; } /* example 2 Alternative syntax*/ $i = 1; while ($i <= 10): echo $i; $i++; endwhile; ?>
- 16. Do While Loop <?php $i = 0; do { echo $i; } while ($i > 0); ?>
- 17. For Loop <?php for ($i = 1; $i <= 10; $i++) { echo $i; } /*Alternate for Syntax */ for($i = 0; $i <= 10; $i++): echo "--".$i; endfor; ?>
- 18. For Each loop <?php $arr = array("zero" , "one" , "two" , "three" , "four" ); /*For each example 1 */ foreach ( $arr as $value ){ print "<br>".$value; } print "<br>"; /*For each example 2 */ foreach ( $arr as $key => $value) { print "<br>At key ".$key." of the array, the value is ".$value; } ?>
- 19. PHP simple Function <?php function adder($var1, $var2){ $sum = $var1+$var2; return $sum; } ?> <html> <head> <title>Function with PHP an example</title> </head> <body> <?php $a=10; $b=15; $added = adder($a, $b); ?> The sum of <?=$a?> and <?=$b?> is <?=$added?>. </body> </html>
- 20. Lets get rolling Write a program that performs all arithmetic operations with 3 variables. Get the month with date(“F”) function and if its December and day date(“d”) is greater than 20 and less than 26, print “Merry Christmas”. Print multiplication table of 5 with for loop. Use foreach loop for an array called names and print the names in the array with its keys.
- 21. Questions are welcome That’s why god gave us two eyes, two ears but only one mouth.
Editor's Notes
- #5: Assign $global and $GLOBALS