String 函数
PHP 手册

strstr

(PHP 4, PHP 5)

strstrFind first occurrence of a string

说明

string strstr ( string $haystack , mixed $needle [, bool $before_needle=false ] )

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

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

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

参数

haystack

The input string.

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 (the default is FALSE), strstr() returns the part of the haystack before the first occurrence of the needle .

返回值

Returns the portion of string, or FALSE if needle is not found.

更新日志

版本 说明
5.3.0 Added the optional parameter before_needle .
4.3.0 strstr() was made binary safe.

范例

Example #1 strstr() example

<?php
$email  
'[email protected]';
$domain strstr($email'@');
echo 
$domain// prints @example.com

$user strstr($email'@'true); // As of PHP 5.3.0
echo $user// prints name
?>

参见


String 函数
PHP 手册