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.
注: 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.
See also strpos(),
strrchr(), substr(),
stristr(), and strstr().