[lang-ref] ( get_keys ) ( php )

<?php
public function testGetKeys(): void
{
	// array_keys($d)
	$d = [ 'A' => 1, 'B' => 2, 'C' => 3 ];

	$keys = array_keys($d);
	$this->assertSame(['A', 'B', 'C'], $keys);
}