test_curl.php

<?php
function curl($url, $opt = null){
	$ch = curl_init($url);
	$op = array(
			CURLOPT_RETURNTRANSFER	=>	true,
			CURLOPT_SSL_VERIFYPEER	=>	false,
			CURLOPT_SSL_VERIFYHOST	=>	false,
			CURLOPT_USERAGENT		=>	"Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:46.0) Gecko/20100101 Firefox/46.0"
		);
	if (is_array($opt)) {
		foreach ($opt as $key => $value) {
			$op[$key] = $value;
		}
	}
	curl_setopt_array($ch, $op);
	$out = curl_exec($ch);
	$err = curl_error($ch) and $out = $err;
	curl_close($ch);
	return $out;
}
$baseurl = "http://seleksi.smkn5-tng.com/";
$pure_source = curl($baseurl);

$a = explode("href=\"", $pure_source);
for ($i=1; $i < count($a); $i++) { 
	$b = explode("\"", $a[$i], 2);
	$b = html_entity_decode($b[0], ENT_QUOTES, 'UTF-8');
	if (strpos($b, "//")===false) {
		$pure_source = str_replace($b, htmlspecialchars($baseurl.$b, ENT_QUOTES, 'UTF-8'), $pure_source);
	}
}

$a = explode("src=\"", $pure_source);
for ($i=1; $i < count($a); $i++) {
	$b = explode("\"", $a[$i], 2);
	$b = html_entity_decode($b[0], ENT_QUOTES, 'UTF-8');
	if (strpos($b, "//")===false) {
		$pure_source = str_replace($b, htmlspecialchars($baseurl.$b, ENT_QUOTES, 'UTF-8'), $pure_source);
	}
}

#var_dump($a);
print $pure_source;