Simple PHP log function

log.php

<?php

/**
 * Write log message
 *
 * @param string $msg Log message
 * @param string $file Filename
 * @param bool $append Append or overwrite file
 */
function log_msg($msg, $file = 'application.log', $append = true)
{
	$filePath = FS_LOGS . $file;

	// Create dir recursive if not exists
	$pathinfo = pathinfo($filePath);
	if (!is_dir($pathinfo['dirname'])) {
		@mkdir($pathinfo['dirname'], 0777, true);
	}

	$newFile = !file_exists($filePath);

	// Write log
	$content = date('Y-m-d H:i:s') . ': ' . $msg . PHP_EOL;
	@file_put_contents($filePath, $content, ($append && !$newFile) ? FILE_APPEND : 0);

	// Change new file permission
	if ($newFile) @chmod($filePath, 0777);
}