strstr
(PHP 4, PHP 5)
strstr — Find first occurrence of a string
说明
string strstr
( string $haystack
, string $needle
, bool $before_needle
)
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 occurence 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 |
|---|---|
| 6.0.0 | Added the before_needle parameter. |
| 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);
echo $user; // prints name
?>