Description
$haystack
, string $needle
, bool $before_needle
= false
): string|false
Returns all of haystack
starting from and including the first
occurrence of needle
to the end.
Parameters
-
haystack
-
The string to search in
-
needle
-
Prior to PHP 8.0.0, if
needle
is not a string, it is converted to an integer and applied as the ordinal value of a character. This behavior is deprecated as of PHP 7.3.0, and relying on it is highly discouraged. Depending on the intended behavior, theneedle
should either be explicitly cast to string, or an explicit call to chr() should be performed. -
before_needle
-
If
true
, stristr() returns the part of thehaystack
before the first occurrence of theneedle
(excluding 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 |
---|---|
8.0.0 |
Passing an int as needle is no longer supported.
|
7.3.0 |
Passing an int as needle has been deprecated.
|
Examples
Example #1 stristr() example
<?php
$email = 'USER@EXAMPLE.com';
echo stristr($email, 'e'); // outputs ER@EXAMPLE.com
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: This function is binary-safe.
See Also
- strstr() - Find the first occurrence of a string
- strrchr() - Find the last occurrence of a character in a string
- stripos() - Find the position of the first occurrence of a case-insensitive substring in a string
- strpbrk() - Search a string for any of a set of characters
- preg_match() - Perform a regular expression match