(PHP 4 >= 4.1.0)
array_key_exists -- Checks if the given key or index exists in the array
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.
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Example 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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Note: This name of this function is key_exists() in PHP version 4.0.6.
See also isset().
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