como faço pra pega um codigo fonte de uma page web. com htmlentities(highlight_string(file_get_contents) e salva em uma aquivo com (.txt ou qualquer outa estranção)

quero usar a URL pra poder coletra o codogo fonte da page e salva em um aqui de (.txt .html .php etc )como eu faço meu progama ja arrumei mas de 10 vez mas so da nisso

e sempre da esse erro

aqui e codigo que eu quelo coloca dentro do aquivo ----------------->(

	;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;!("fullscreenEnabled"&nbsp;in&nbsp;document&nbsp;||&nbsp;"webkitFullscreenEnabled"&nbsp;in&nbsp;document&<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;!("requestFileSystem"&nbsp;in&nbsp;window&nbsp;||&nbsp;"webkitRequestFileSystem"&nbsp;in&nbsp;window&nbsp<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;href&nbsp;+=&nbsp;'redirect='&nbsp;+&nbsp;encodeURIComponent(window.location.href)&nbsp;+&nbs<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(NSLPopupCenter(href&nbsp;+&nbsp;'display=popup',&nbsp;'nsl-social-connect',&nbsp;$ta<br /></html><!--&nbsp;WP&nbsp;Fastest&nbsp;Cache&nbsp;file&nbsp;was&nbsp;created&nbsp;in&nbsp;0.6319899559021&nbsp;seconds,&nbsp;on&nbsp;15-08-18&nbsp;16:58:24&nbsp;--><!--&nbsp;via&nbsp;php&nbsp;--></span>

	</code>PHP Warning:  Cannot modify header information - headers already sent by (output started at C:\Users\Desktop\inde.php:4) in C:\Users\Desktop\inde.php on line 9

	Warning: Cannot modify header information - headers already sent by (output started at C:\Users\Desktop\inde.php:4) in C:\Users\Desktop\inde.php on line 9

	PHP Warning:  fopen(C\Users\Desktop        iz.txt): failed to open stream: No such file or directory in C:\Users\Desktop\inde.php on line 11

	Warning: fopen(C\Users\Desktop     iz.txt): failed to open stream: No such file or directory in C:\Users\Desktop\inde.php on line 11

	PHP Warning:  fwrite() expects parameter 1 to be resource, string given in C:\Users\Desktop\inde.php on line 19)

	 

	//cone.php pode ser uma URL ou ate msm o aquivo que eu quelo copiar o codigo fonte

	<?php

	$file ="cone.php"; //nome do aquivo

	show_source($file); //ler os codigos foten do aquivo

	htmlentities(highlight_string(file_get_contents("$file"))); //pega o aquivo 

	header("$file");  

	$fp = fopen("C\Users\Desktop\tiz.txt","a+");

	foreach($_POST as $variable => $value){

	    fwrite($file, $variable);

	    fwrite($file, "=");

	    fwrite($file, $value);

	    fwrite($file, "\r\n");

	}

	fwrite($file, "\r\n");

	fclose($file);

	exit;

	?>