php 7 array_key_first() code example
Example 1: get first key of array php
$firstKey = array_key_first($array);
Example 2: get array first element key php
For PHP version 7 and above
$array = array(
"1" => "PHP code tester Sandbox Online",
"foo" => "bar",
"case" => "Random Stuff: " . rand(100,999),
"PHP Version" => phpversion()
);
$firstValue = reset($colors); // PHP code tester Sandbox Online
$firstKey = key($colors); // 1