Description
bool
array_key_exists ( mixed key,
array search)
array_key_exists() returns TRUE if the given key is set in the array. key can be any value possible for an
array index.
範例 1.
array_key_exists() example
$search_array = array("first" = 1, "second" = 4);
if (array_key_exists("first", $search_array)) {
echo "The 'first' element is in the array";
}
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注: The name of this function is key_exists() in PHP version 4.0.6.
See also isset().