PHP

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!');
?>

php console output

<?php
  
  $message = "Thanks..";
  
  echo "<script>console.log('".$message."');</script>";
  
?>
    
Output: Thanks..

php console log

echo("<script type='text/javascript'> console.log($msg);</script>");

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!');
?>

php print to console

<script>
    console.log(<?= json_encode($foo); ?>);
</script>

php console log

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

php console print

$a = array(
 null => 'a',
 true => 'b',
 false => 'c',
 0 => 'd',
 1 => 'e',
 '' => 'f'
);

echo count($a), "
";