Note:
If needle
is a string, the comparison is done
in a case-sensitive manner.
haystack
The array.
strict
If the third parameter strict
is set to TRUE
then the array_search() function will also check the
types of the
needle
in the haystack
.
Return Values
Returns the key for needle
if it is found in the
array, FALSE otherwise.
If 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.
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.
ChangeLog
Version
Description
4.2.0
Prior to PHP 4.2.0, array_search() returns NULL
on failure instead of FALSE.
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