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# strstr

(PHP 3, PHP 4, PHP 5)

strstr -- Find first occurrence of a string

## Description

string strstr ( string haystack, string needle )

Returns part of `haystack` string from the first occurrence of `needle` to the end of `haystack`.

If `needle` is not found, returns `FALSE`.

If `needle` is not a string, it is converted to an integer and applied as the ordinal value of a character.

> 注意: This function is case-sensitive. For case-insensitive searches, use stristr().

例 1. strstr() example

`<?php $email = 'user@example.com'; $domain = strstr($email, '@'); echo $domain; // prints @example.com ?>`

> 注意: If you only want to determine if a particular `needle` occurs within `haystack`, use the faster and less memory intensive function strpos() instead.

strstr() has been binary safe since PHP 4.3.0

See also preg_match(), stristr(), strpos(), strrchr(), and substr().

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