Apache ModRewrite Detection

index.php

<?php

if(isset($_GET['q'])){
	echo "Test successful";
	exit();
}

$do_test = false;
if(function_exists("apache_get_modules")){
	echo "Running as Apache 2 Module<br/>";
	if(in_array('mod_rewrite',apache_get_modules())){
		echo "mod_rewrite is enabled<br/>";
		$do_test = true;
	}
	else{
		echo "mod_rewrite is not enabled in httpd.conf<br/>";
	}
}
elseif(stristr($_SERVER['SERVER_SOFTWARE'],'Apache')){
	echo "Running with Apache as cgi<br/>";
	$do_test = true;
}
else{
	echo "Unsupported webserver";
}

if($do_test){
	$file = ".htaccess";
	$module = "mod_rewrite.c";
	$path = str_replace($_SERVER['DOCUMENT_ROOT'],'',$_SERVER['SCRIPT_FILENAME']);
	$path = dirname($path);
	$path = str_replace('\\','/',$path);
	if($path[0] != '/'){
		$path = '/'.$path;
	}
	echo "RewriteBase ".$path."<br/>";
	$content = '<IfModule '.$module.'>
	RewriteEngine on
	RewriteBase '.$path.'
	RewriteCond %{REQUEST_FILENAME} !-f
	RewriteCond %{REQUEST_FILENAME} !-d
	RewriteRule (.*) index.php?q=$1
</IfModule>';
	$written = @file_put_contents($file, $content);

	if($written == false){
		echo "Can't write .htacces<br/>Check chmod and try again";
		exit();
	}

	$protocol = 'http';
	if(isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on"){
		$protocol .= 's';
	}

	$port = '';
	if ($_SERVER["SERVER_PORT"] != "80") {
		$port = ":".$_SERVER["SERVER_PORT"];
	}

	$url = $protocol.'://'.$_SERVER["SERVER_NAME"].$port.$_SERVER["REQUEST_URI"].'test';
	
	$headers = @get_headers($url, 1);
	$unlink = true;
	if($headers == false){
		echo "url_fopen is disabled.Please go to <a href='test'>this</a> page.<br/>If the content is 'Test successful' everything is right";
		$unlink = false;
	}
	elseif(stristr($headers[0],'404')){
		echo "ModRewrite failed";
	}
	elseif(stristr($headers[0],'500')){
		echo "Htaccess failed";
	}
	elseif(stristr($headers[0],'200')){
		echo "Test successful";
	}
	else{
		echo "Unexpected Result:<br/>";
		var_dump($headers);
	}
	if($unlink){
		unlink($file);
	}
}

?>

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