array_keys
array array_keys(array array) Returns all valid keys for the given array.
Returns:
Indexed array of keys; NULL on failure
Description:
Retrieves all the keys from an array and returns them as an indexed array.
Version:
PHP 4
Existing since version 4.0
Example:
Get the keys from arrays
$hash1 = array("lions", "tigers", "bears", "oh my");
$hash2 = array("r" => "red", "g" => "green", "b" => "blue");
echo "Keys for \$hash1: ", implode(", ", array_keys($hash1)), "\n";
echo "Keys for \$hash2: ", implode(", ", array_keys($hash2));
Output:
Keys for $hash1: 0, 1, 2, 3
Keys for $hash2: r, g, b
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