Function to set precedence to Apache mime types repo (with PHP mime_content_type fallback). Caches repo locally to avoid unnecessary http calls.

mime_types.php

<?php

/**
ABSTRACT
	
	Sets precedence to Apache mime types repo at http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types

	Caches the Apache repo locally (in php temp folder) to avoid unnecessary http calls.
	
	Fallback to native PHP mime_content_type function if no extension match.
	
USAGE

	mime_types('/var/www/html/index.php'); // response: text/x-php
	
	mime_types('js'); // response: application/javascript
	
	mime_types(); // returns a full Apache repo array (from cached repo if possible).
	
	e.g.: 
	Array
	(
		[3dml] => text/vnd.in3d.3dml
		[3ds] => image/x-3ds
		[3g2] => video/3gpp2
		[3gp] => video/3gpp
		[7z] => application/x-7z-compressed
		[aab] => application/x-authorware-bin
		...
	
	mime_types(true); // refreshes cached repo from Apache source and returns full array.
*/

function mime_types($data='') {
	$url = 'http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types';
	$local = sys_get_temp_dir().'/mime.types';
	
	if ( $data === true ) {
		@unlink($local); // Clear cache
		$data='';
	}
	
	// Define extension from name or file path.
	$extension=false;
	if ( !empty($data) ) {
		if ( strstr($data,'.') ) {
			$extension=pathinfo(basename($data),PATHINFO_EXTENSION);
		}else{
			$extension=$data;
		}
	}

	// Use locally cached array if exists.
	if ( realpath($local) ) {
		//echo('is local');
		$contents=file_get_contents(realpath($local));
		$mime_types = unserialize($contents);
	} else {
		// Parse Apache doc to array.
		$mimes = array();
		foreach(@explode("\n",@file_get_contents($url)) as $x){
			if(isset($x[0]) && $x[0]!=='#' && preg_match_all('#([^\s]+)#', $x, $out) && isset($out[1]) && ($c = count($out[1])) > 1){
				for($i=1; $i < $c; $i++){
					$mimes[$out[1][$i]] = $out[1][0];
				}
			}
		}
		$mime_types = (@ksort($mimes)) ? $mimes : false;
		if ( strstr($mime_types['pdf'],'application') ) {
			@file_put_contents($local,serialize($mime_types));
		}
	}
	
	if ( $extension ) {
		if ( isset($mime_types[$extension]) ) {
			return $mime_types[$extension];
		}
		if ( realpath($data) && function_exists('mime_content_type') ) {
			return mime_content_type(realpath($data));
		}
		return "application/octet-stream"; // Default
	}
	
	// Return full array if no arguments.
	if ( strstr($mime_types['pdf'],'application') ) {
		return $mime_types; 
	}
	
	return false; // Something when terribly wrong.
}