keyFirst()

The keyFirst() method returns first key

Example.php
<?php use kim\present\utils\arrays\ArrayUtils;

$arrayUtils = ArrayUtils::from(["Apple" => 0, "Banana" => 1, "Carrot" => 2]);

//Gets first key
$arrayUtils->keyFirst();
// expected output: "Apple"

Syntax

$arrayUtils->keyFirst() : int|string|null;

Return value

  • A first key of array. If array is empty, returns NULL.

Prefixing

ArrayUtils::keyFirstFrom(iterable $from) : int|string|null;

References

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