My PHP debug function.

debug-function.php

<?php
/**
 * Debug function
 * 
 * @param mixed $data The data, that should be debugged.
 * @param bool $dump (default: false) Show var_dump output.
 * @param bool $console (default: false) Print debug message to the console.
 * @return void
 */
function debug($data, $dump = false, $console = false) {
	$line = debug_backtrace()[0]['line'];

	if ($dump) {
		ob_start();
		var_dump($data);
		$data = ob_get_clean();
	} else {
		$data = var_export($data, true);
	}

	if (!$console) {
		$msg  = '<pre>';
		$msg .= '<strong>'.$line.': </strong>';
		$msg .= $data;
		$msg .= '</pre>';
	} else {
		$msg  = '<script>console.log(';
		$msg .= substr_replace(json_encode($data), $line.': ', 1, 0);
		$msg .= ');</script>';
	}

	echo $msg;
}
?>