nicely styled, easy to read, debug($someval, __FILE__.__LINE__); because nobody I know uses zend debugger :(

debug.php

<?php

// debug() - Copyright (C) 2006-2009 Robert Wallis
// print out the value to be read in the browser
if (!function_exists('debug'))
{
	function debug($value, $name='')
	{
		print('<pre>');
		if ($name)
			print(
				'<div style="background-color:#313131; color:#FFFFFF; padding: 10px 10px 0px 10px; font-size:16px; font-family: sans-serif;">'.$name.'</div>'.
				'<div style="background-color:#525252; color:#FF9900; padding: 0px 10px 10px 10px; font-size:13px;">'
			);
		else
			print('<div style="background-color:#525252; color:#FF9900; padding: 10px 10px 10px 10px; font-size:13px;">');

		ob_start();
		var_dump($value);
		$output = ob_get_contents();
		ob_end_clean();
		
		print(htmlentities($output).'</div></pre>');
	} // debug
}