String Functions
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PHP strstr() Function

Topic: PHP String ReferencePrev|Next

Description

The strstr() function find the first occurrence of a string within another string.

This function is case-sensitive. For case-insensitive searches, use the stristr() function.

The following table summarizes the technical details of this function.

Return Value: Returns the portion of string, or FALSE if the string to search for is not found.
Changelog: Since PHP 7.3.0, passing an integer as search parameter has been deprecated.
Version: PHP 4+

Syntax

The basic syntax of the strstr() function is given with:

strstr(string, search, before_search);

The following example shows the strstr() function in action.

<?php
// Sample string
$str = "johnclark@mail.com";

// Searching for the substring
echo strstr($str, "@");
?>

Tip: If you simply want to find out if a particular substring occurs within a string or not, use the faster and less memory intensive function strpos() instead.


Parameters

The strstr() function accepts the following parameters.

Parameter Description
string Required. Specifies the string to search.
search Required. Specifies the string to search for.
before_search Optional. If set to true, it returns the part of the string before the first occurrence of the search string. Default value is false which returns all of the string after the first occurrence of the search string (including search string itself).

More Examples

Here're some more examples showing how strstr() function actually works:

The following example returns the part of the string before the first occurrence of @ symbol.

<?php
// Sample string
$str = "johnclark@mail.com";

// Searching for the substring
echo strstr($str, "@", true);
?>
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