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strpos

(PHP 3, PHP 4, PHP 5)

strpos -- Find position of first occurrence of a string

Description

int strpos ( string haystack, mixed needle [, int offset] )

Returns the numeric position of the first occurrence of needle in the haystack string. Unlike the strrpos() before PHP 5, this function can take a full string as the needle parameter and the entire string will be used.

Parameters

haystack
needle: If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.
offset: The optional offset parameter allows you to specify which character in haystack to start searching. The position returned is still relative to the beginning of haystack.

Return Values

Returns the position as an integer. If needle is not found, strpos() will return boolean FALSE.

Warning

This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE, such as 0 or "". Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

Examples

Example 1. strpos() examples


<?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";
}

// 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.