Text and Numbers (Data Types)in PHP
- 1. Working with Text and Numbers Text Numbers Variables
- 2. TEXT • Spend lot of time handling text • Generates HTML and works with data in databases • Slicing and dicing text means we can easily built the dynamic websites • Pieces of text are called strings • String can contain any characters( letters, numbers, spaces, tabs ) • String can even contain binary files such as image or sound
- 3. Defining text strings • Simples way is to surround with single quotes(‘ ’)
- 5. • To print single quote inside single quote we need backslash character() • Also called as escape character
- 7. • Escape character can be escaped itself
- 9. • Only characters that get special treatment inside single quotes are single quotes and backslash character
- 11. • Strings can also be defined with the help of double quotes but they have more special characters
- 12. • String can also be defined with the help of here document
- 14. • To combine two strings period(.) is used
- 16. Manipulating Text • Validation • Input coming is as per our requirement or not • Formating • Change the look of the output
- 17. Validation • trim() • strlen() • Comparing string with equality operator • strcasecmp()
- 18. trim() • Syntax: • trim( string, charlist ) • Removes whitespaces and other pre-defined characters from left and right of the string • Related functions: • ltrim( string, charlist ) • rtrim( string, charlist )
- 29. Formating
- 33. • strtoupper() - converts a string to uppercase • strtolower() - converts a string to uppercase • lcfirst() - converts the first character of a string to lowercase • ucfirst() - converts the first character of a string to uppercase • ucwords() - converts the first character of each word in a string to uppercase
- 38. • The substr() function returns a part of a string. • Syntax • substr(string,start,length) • A positive number - Start at a specified position in the string • A negative number - Start at a specified position from the end of the string • 0 - Start at the first character in string
- 41. • The str_replace() function replaces some characters with some other characters in a string. • Syntax • str_replace(find,replace,string)
- 45. Arithmetic Operators • * • / • % • + • -
- 48. Variables • Holds the data in the program
- 52. Combined assignment and addition
- 54. Combined assignment and concatenation
- 58. Putting Variables inside string