Description
string stristr
( string $haystack
, string $needle
, bool $before_needle
)
Returns all of haystack from the first occurrence of needle to the end.
Parameters
- haystack
-
- 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), stristr() returns the part of the haystack before the first occurence of the needle .
needle and haystack are examined in a case-insensitive manner.
Return values
Returns the matched substring. If needle is not found, returns FALSE.
ChangeLog
| Version | Description |
|---|---|
| 6.0.0 | Added the before_needle parameter. |
| 4.3.0 | stristr() was made binary safe. |
Examples
Example#1 stristr() example
<?php
$email = '[email protected]';
echo stristr($email, 'e'); // outputs [email protected]
echo stristr($email, 'e', true); // 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
?>
Notes
Note: Tämä funktio osaa käsitellä myös binäärimuotoista dataa.