testPerformance.php

<?php

 

generalData();

function generalData()
{
	$id = 26;
	$max = 100000000000000000000;
	$startMemory = memory_get_usage();
	
	$create = function () use ($max, $id) {
		$data = [];
		for ($i = 0; $i < $max; $i++) {
			$item = [];
			$item[] = $id;
			$item[] = generateRandomString(10);
			yield $item;
		}
	};
	
	$data = $create();

	echo '<br>';
	echo '<br>';
	echo memory_get_usage() - $startMemory, ' bytes';
	exit;
}

function generateRandomString($length = 10)
{
	$characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
	$charactersLength = strlen($characters);
	$randomString = '';
	for ($i = 0; $i < $length; $i++) {
		$randomString .= $characters[rand(0, $charactersLength - 1)];
	}
	return $randomString;
}