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 in PHP 4. If a string is passed
as the needle, then only the first character of that string will
needle is not found, returns FALSE.
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:
needle is not a string, it is converted
to an integer and applied as the ordinal value of a character.
Note: As of PHP 5.0.0
offsetmay be specified to begin searching an arbitrary number of characters into the string. Negative values will stop searching at an arbitrary point prior to the end of the string.
needlemay be a string of more than one character as of PHP 5.0.0.