strrpos

PHP Manual
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Description

int strrpos (string haystack, char needle)

Returns the numeric position of the last occurrence of needle in the haystack string. Note that the needle in this case can only be a single character. If a string is passed as the needle, then only the first character of that string will be used.

If needle is not found, returns false.

Note: It is easy to mistake the return values for "character found at position 0" and "character not found". Here's how to detect the difference:
// in PHP 4.0b3 and newer:
$pos = strrpos ($mystring, "b");
if ($pos === false) { // note: three equal signs
    // not found...
}

// in versions older than 4.0b3:
$pos = strrpos ($mystring, "b");
if (is_string ($pos) && !$pos) {
    // not found...
}
	

If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.

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