Mine

<?php
	show_file(file('index.php'), 1);

	function show_file($input, $font){
		
		$longest = 0;
		$length = 0;
		foreach($input as $line){ 
			if(strlen($line) > $longest){
				$longest = strlen($line);
			}  
		}
		$l_height = imagefontheight($font)++;
		
		$doc_height = count($input) * $l_height;
		$doc_width = imagefontwidth($font)++;
		
		$im = imagecreate($doc_width, $doc_height);
		$black = imagecolorallocate($im, 0, 0, 0);
		
		$count = 0;
		foreach($input as $line){
			imagestring($im, $font, $count, 0, $line, $black);
			$count += $l_height++;
		}
		
		header("Content-type: image/jpeg");
		imagejpeg($im);
	}
?>