< PHP
A PHP function to compare strings case-insensitive. Also see strstr.
stristr -- Case-insensitive strstr()
Description
string stristr ( string haystack, string needle )
Returns all of haystack from the first occurrence of needle to the end. needle and haystack are examined in a case-insensitive manner.
If needle is not found, returns FALSE.
If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.
<?php $email = 'USER@EXAMPLE.com'; echo stristr($email, 'e'); // outputs ER@EXAMPLE.com ?>
Example 2. Testing if a string is found or not
<?php $string = 'Hello World!'; if(stristr($string, 'earth') === FALSE) { echo '"earth" not found in string'; } // outputs: "earth" not found in string ?>
Example 3. Using a non "string" needle
<?php $string = 'APPLE'; echo stristr($string, 97); // 97 = lowercase a // outputs: APPLE ?>