PHP strstr() Function: Usage, Parameters, Return Values, and Examples
This article explains the PHP strstr() function, detailing its signature, parameters, return values, and providing clear code examples that demonstrate how to extract substrings before or after a specified needle within a string.
strstr() searches for the first occurrence of a substring within a string and can return either the portion of the string from that point onward or the part before it.
Signature:
string strstr(string $haystack, mixed $needle, bool $before_needle = false)Parameters:
haystack : the input string.
needle : the substring to search for; if not a string it is converted to an integer and used as a character position.
before_needle : if true, returns the part of $haystack before $needle.
Return value: the portion of the string as described, or FALSE if the needle is not found.
Example 1:
<?php
$email = '[email protected]';
$domain = strstr($email, '@');
echo $domain; // prints @example.com
$user = strstr($email, '@', true);
echo $user; // prints name
?>Example 2:
<?php
echo strstr("Hello world!", "world", true); // prints Hello
?>Signed-in readers can open the original source through BestHub's protected redirect.
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