PHP string is a sequence of characters. It is used to store and manipulate text. We can specify a string literal in four ways:
- single quoted
- double quoted
- heredoc syntax
- nowdoc syntax (since PHP 5.3.0)
Single quoted: We can specify string in single quotes (the Character).
Example
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<?php $s='Hello string with single quote'; echo $s; ?> |
Output
Hello string with single quote
Double quoted:We can also specify string in double quotes.
Example1
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<?php $s="Hello php with Double Quotes."; echo $s; ?> |
Output
Hello php with Double Quotes.
Example2
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<html> <body> <?php $s="Using double "quotes" directly inside double quoted string"; echo $s; ?> </body> </html> |
Output
Parse error: syntax error, unexpected ‘quotes’ (T_STRING) in C:\xampp\htdocs\phpfolder\index.php on line 4
PHP String
There are various string functions in PHP. These are given below:
Following are string functions
| String Functions | Description |
| strtolower() | It returns string in lowercase letter. |
| strtoupper() | It returns string in uppercase letter. |
| strlen() | It returns the length of a string. |
| str_word_count() | It counts the number of words in a string. |
| strrev() | It reverses a string. |
| strpos() | It searches for a specific text within a string. |
| str_replace() | It replaces some characters with some other characters in a string. |
| ltrim() | It removes characters from the left side of a string. |
| md5() | It calculates the MD5 hash of a string. |
| strtok() | It splits a string into smaller strings (tokens). etc |
| range() | It is an array that contains a range of elements. |
PHP strtolower() function: The strtolower() function is used to return string in lowercase letter.
Example
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<!DOCTYPE html> <html> <body> <?php $str="HELLO WORLD PHP"; echostrtolower($str); ?> </body> </html> |
Output
hello world php
PHP strtoupper() function: The strtoupper()function is used to return string in uppercase letter.
Example
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<!DOCTYPE html> <html> <body> <?php $str="hello world php"; echomb_strtoupper($str); ?> </body> </html> |
Output
HELLO WORLD PHP
PHP strlen() function:The strlen() function is used to return the length of a string.
Example
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<!DOCTYPE html> <html> <body> <?php $str="hello world php"; echostrlen($str); ?> </body> </html> |
Output
15
PHP strrev() function:The strrev() function is used to reverse a string. Example
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<!DOCTYPE html> <html> <body> <?php $str="hello world php"; echostrrev($str); ?> </body> </html> |
Output
phpdlrowolleh
PHP md5()function:The md5() function is used to calculate the MD5 hash of a string.
Example
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<!DOCTYPE html> <html> <body> <?php echo md5("Hello world"); ?> </body> </html> |
Output
3e25960a79dbc69b674cd4ec67a72c62
Note:you can try it yourself, someabove functions of string.