<?php
namespace W3TC;
class Util_Mime {
/**
* Returns file mime type
*
* @param string $file
* @return string
*/
static public function get_mime_type( $file ) {
static $cache = array();
if ( !isset( $cache[$file] ) ) {
$mime_type = false;
/**
* Try to detect by extension (fast)
*/
$mime_types = include W3TC_INC_DIR . '/mime/all.php';
foreach ( $mime_types as $extension => $type ) {
if ( preg_match( '~\.(' . $extension . ')$~i', $file ) ) {
if ( is_array( $type ) )
$mime_type = array_pop( $type );
else
$mime_type = $type;
break;
}
}
/**
* Try to detect using file info function
*/
if ( !$mime_type && function_exists( 'finfo_open' ) ) {
$finfo = @finfo_open( FILEINFO_MIME );
if ( !$finfo ) {
$finfo = @finfo_open( FILEINFO_MIME );
}
if ( $finfo ) {
$mime_type = @finfo_file( $finfo, $file );
if ( $mime_type ) {
$extra_mime_type_info = strpos( $mime_type, "; " );
if ( $extra_mime_type_info ) {
$mime_type = substr( $mime_type, 0, $extra_mime_type_info );
}
if ( $mime_type == 'application/octet-stream' ) {
$mime_type = false;
}
}
@finfo_close( $finfo );
}
}
/**
* Try to detect using mime type function
*/
if ( !$mime_type && function_exists( 'mime_content_type' ) ) {
$mime_type = @mime_content_type( $file );
}
/**
* If detection failed use default mime type
*/
if ( !$mime_type ) {
$mime_type = 'application/octet-stream';
}
$cache[$file] = $mime_type;
}
return $cache[$file];
}
}