(PHP 4 >= 4.0.5, PHP 5)array_search -- Searches the array for a given value and returns the corresponding key if successful
needle and returns the key if it is found in
the array, FALSE otherwise.
needleis a string, the comparison is done in a case-sensitive manner.
Note: Prior to PHP 4.2.0, array_search() returns NULL on failure instead of FALSE.
If the optional third parameter
strict is set to
TRUE then the array_search()
will also check the types of the
needle is found in
haystack more than once, the first matching key
is returned. To return the keys for all matching values, use
array_keys() with the optional
search_value parameter instead.
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.