get first key of array php

1$firstKey = array_key_first($array);

1array_values($array)[0];
2

1$colors = array(2=>"blue",3 =>"green",1=>"red");
2$firstValue = reset($colors); //blue
3$firstKey = key($colors); //2

1<?php
2$stack = array("orange", "banana", "apple", "raspberry");
3$fruit = array_shift($stack); //Remove "orange" from array and return it
4print_r($stack);
5/** OUTPUT:
6Array
7(
8    [0] => banana
9    [1] => apple
10    [2] => raspberry
11)
12*/
13?>

1array_shift(array_values($array));
2

1For PHP version 7 and above
2
3$array = array(
4  	"1" => "PHP code tester Sandbox Online",  
5	"foo" => "bar",
6	"case" => "Random Stuff: " . rand(100,999),
7	"PHP Version" => phpversion()
8);
9             
10$firstValue = reset($colors); // PHP code tester Sandbox Online
11$firstKey = key($colors); // 1