strpos
strpos
(PHP 4, PHP 5, PHP 7)
strpos — Find the position of the first occurrence of a substring in a string
Description
mixed strpos ( string $haystack , mixed $needle [, int $offset = 0 ] )
Find the numeric position of the first occurrence of needle
in the haystack
string.
Parameters
-
haystack
-
The string to search in.
-
needle
-
If
needle
is not a string, it is converted to an integer and applied as the ordinal value of a character. -
offset
-
If specified, search will start this number of characters counted from the beginning of the string. If the offset is negative, the search will start this number of characters counted from the end of the string.
Return Values
Returns the position of where the needle exists relative to the beginning of the haystack
string (independent of offset). Also note that string positions start at 0, and not 1.
Returns FALSE
if the needle was not found.
This function may return Boolean FALSE
, but may also return a non-Boolean value which evaluates to FALSE
. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.
Changelog
Version | Description |
---|---|
7.1.0 | Support for negative offset s has been added. |
Examples
Example #1 Using ===
<?php $mystring = 'abc'; $findme = 'a'; $pos = strpos($mystring, $findme); // Note our use of ===. Simply == would not work as expected // because the position of 'a' was the 0th (first) character. if ($pos === false) { echo "The string '$findme' was not found in the string '$mystring'"; } else { echo "The string '$findme' was found in the string '$mystring'"; echo " and exists at position $pos"; } ?>
Example #2 Using !==
<?php $mystring = 'abc'; $findme = 'a'; $pos = strpos($mystring, $findme); // The !== operator can also be used. Using != would not work as expected // because the position of 'a' is 0. The statement (0 != false) evaluates // to false. if ($pos !== false) { echo "The string '$findme' was found in the string '$mystring'"; echo " and exists at position $pos"; } else { echo "The string '$findme' was not found in the string '$mystring'"; } ?>
Example #3 Using an offset
<?php // We can search for the character, ignoring anything before the offset $newstring = 'abcdef abcdef'; $pos = strpos($newstring, 'a', 1); // $pos = 7, not 0 ?>
Notes
Note: This function is binary-safe.
See Also
- stripos() - Find the position of the first occurrence of a case-insensitive substring in a string
- strrpos() - Find the position of the last occurrence of a substring in a string
- strripos() - Find the position of the last occurrence of a case-insensitive substring in a string
- strstr() - Find the first occurrence of a string
- strpbrk() - Search a string for any of a set of characters
- substr() - Return part of a string
- preg_match() - Perform a regular expression match
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.strpos.php