debug or console log in php code example

Example 1: php console log

// Assuming you are wishing to log to the JS Console...

<?php
	function consoleLog($msg) {
		echo '<script type="text/javascript">' .
          'console.log(' . $msg . ');</script>';
	}

	consoleLog('Hello, console!');
?>

Example 2: php console log

// A little correction / improvement to @Kaotik's answer:
<?php
	function consoleLog($msg)
	{
		echo '<script type="text/javascript">console.log('
          . str_replace('<', '\\x3C', json_encode($msg))
          . ');</script>';
	}

	consoleLog('Hello, console!');
?>