PHP 4, PHP 5, PHP 7, PHP 8
stristr - Case-insensitive strstr

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

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



The string to search in


Prior to PHP 8.0.0, if needle is not a string, it is converted to an integer and applied as the ordinal value of a character. This behavior is deprecated as of PHP 7.3.0, and relying on it is highly discouraged. Depending on the intended behavior, the needle should either be explicitly cast to string, or an explicit call to chr should be performed.


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.



This function is binary-safe.


Version Description
8.0.0 Passing an int as needle is no longer supported.
7.3.0 Passing an int as needle has been deprecated.

Related Functions

Example of stristr

Show all examples for stristr

PHP Version:

Function stristr:

Strings Functions

Most used PHP functions