key
mixed key(array array) Returns the key for the element in the current position.
Returns:
Key of the current array element; FALSE on error
Description:
key() is used to retrieve the key of the element to which the internal array pointer is currently set.
Version:
PHP 3, PHP 4
See also:
current() end() next() prev() reset()
Example:
Fetch the key of the current array element
$my_array = array("x" => "two", "z" => "four", "y" => "three", "w" => "one");
do {
echo "Key: ", key($my_array), "\n";
} while (each($my_array));
Output:
Key: x
Key: z
Key: y
Key: w
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