Returns all of haystack from the first occurrence of needle to the end.
The string to search in
If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.
If TRUE (the default is FALSE), stristr() returns the part of the haystack before the first occurrence of the needle .
needle and haystack are examined in a case-insensitive manner.
Returns the matched substring. If needle is not found, returns FALSE.
| 版本 | 说明 |
|---|---|
| 5.3.0 | Added the optional parameter before_needle . |
| 4.3.0 | stristr() was made binary safe. |
Example #1 stristr() example
<?php
$email = 'USER@EXAMPLE.com';
echo stristr($email, 'e'); // outputs ER@EXAMPLE.com
echo stristr($email, 'e', true); // As of PHP 5.3.0, outputs US
?>
Example #2 Testing if a string is found or not
<?php
$string = 'Hello World!';
if(stristr($string, 'earth') === FALSE) {
echo '"earth" not found in string';
}
// outputs: "earth" not found in string
?>
Example #3 Using a non "string" needle
<?php
$string = 'APPLE';
echo stristr($string, 97); // 97 = lowercase a
// outputs: APPLE
?>
Note: 本函数可安全用于二进制对象。