PHP Manual: Case-insensitive strstr

Description

string stristr ( string $haystack , mixed $needle [, bool $before_needle = false ] )

Returns all of haystack starting from and including the first occurrence of needle to the end.

Parameters

haystack: The string to search in
needle: If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.
before_needle: If TRUE, stristr returns the part of the haystack before the first occurrence of the needle (excluding needle).

needle and haystack are examined in a case-insensitive manner.

Return Values

Returns the matched substring. If needle is not found, returns FALSE.

Changelog

Version	Description
5.3.0	Added the optional parameter `before_needle`.
4.3.0	stristr was made binary safe.

Examples

Example #1 stristr example


<?php
  $email = 'USER@EXAMPLE.com';
  echo stristr($email, 'e'); // outputs ER@EXAMPLE.com
  echo stristr($email, 'e', true); // As of PHP 5.3.0, outputs US
?>

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
?>

Notes

Note: This function is binary-safe.

stristr