What is the array_key_first method in PHP?
The array_key_first method can be used to get the first key of an array.
Syntax
array_key_first(array $array): int|string|null
If the passed array doesn’t have any elements, then it returns null.
Example
<?php$arr = ['ONE' => 1,'TWO' => 2,'THREE' => 3];$firstKey = array_key_first($arr);echo "The first key of the array is :". $firstKey;?>
In the code above, we create an array and get the first key of the array using the array_key_first method.
Example 2
Let’s call array_key_first on an empty array.
<?php$arr = [];$firstKey = array_key_first($arr);var_dump($firstKey);?>
In the code above, we will get NULL as a result because the passed array is empty.
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