keyFirst()
The keyFirst() method returns first key
<?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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