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PHP stristr

PHP original manual for stristr [ show | php.net ]

stristr

(PHP 4, PHP 5, PHP 7)

stristr — 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
  $email = '[email protected]';
  echo stristr($email, 'e'); // outputs [email protected]
  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.

See Also

  • strstr() - Find the first occurrence of a string
  • strrchr() - Find the last occurrence of a character in a string
  • stripos() - Find the position of the first occurrence of a case-insensitive substring in a string
  • strpbrk() - Search a string for any of a set of characters
  • preg_match() - Perform a regular expression match