e949/api/_utils.php

<?php // Utility functions

// Check if request was to specified file
function ThisFileIsRequested ($fullpath): bool {
	return substr($fullpath, -strlen($_SERVER["SCRIPT_NAME"])) === $_SERVER["SCRIPT_NAME"];
}

// Generate secure random string
function GenerateRandomString (int $length, string $keyspace = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"): string {
	if ($length < 1) {
		die("cant generate random string of size less than 1");
	}
	$pieces = [];
	$max = mb_strlen($keyspace, "8bit") - 1;
	for ($i = 0; $i < $length; ++$i) {
		$pieces []= $keyspace[random_int(0, $max)];
	}
	return implode('', $pieces);
}

// Get aspect ratio from width and height
function GetAspectRatio ($x, $y) {
	if ($x === $y)
		return 1;
	return max($x, $y) / min($x, $y);
}

?>