Get MIME-type by URL - php

Question

Fore example exif_imagetype() works fine
<?php echo exif_imagetype('http://orig01.deviantart.net/ace1/f/2010/227/4/6/png_test_by_destron23.png');
But finfo_file() does not work.
<?php echo finfo_file(finfo_open(FILEINFO_MIME), 'http://orig01.deviantart.net/ace1/f/2010/227/4/6/png_test_by_destron23.png');
and got
Warning: finfo_file(): Failed identify data 0:(null) in /test.php on line 1
Any thoughts?

Answer 1

It is need to stream_wrapper_register()
class MimeStreamWrapper
{
const WRAPPER_NAME = 'mime';
/**
* #var resource
*/
public $context;
/**
* #var bool
*/
private static $isRegistered = false;
/**
* #var callable
*/
private $callBackFunction;
/**
* #var bool
*/
private $eof = false;
/**
* #var resource
*/
private $fp;
/**
* #var string
*/
private $path;
/**
* #var array
*/
private $fileStat;
/**
* #return array
*/
private function getStat()
{
if ($fStat = fstat($this->fp)) {
return $fStat;
}
$size = 100;
if ($headers = get_headers($this->path, true)) {
$head = array_change_key_case($headers, CASE_LOWER);
$size = (int)$head['content-length'];
}
$blocks = ceil($size / 512);
return array(
'dev' => 16777220,
'ino' => 15764,
'mode' => 33188,
'nlink' => 1,
'uid' => 10000,
'gid' => 80,
'rdev' => 0,
'size' => $size,
'atime' => 0,
'mtime' => 0,
'ctime' => 0,
'blksize' => 4096,
'blocks' => $blocks,
);
}
/**
* #param string $path
*/
public function setPath($path)
{
$this->path = $path;
$this->fp = fopen($this->path, 'rb') or die('Cannot open file: ' . $this->path);
$this->fileStat = $this->getStat();
}
/**
* #param int $count
* #return string
*/
public function read($count) {
return fread($this->fp, $count);
}
/**
* #return string
*/
public function getStreamPath()
{
return str_replace(array('ftp://', 'http://', 'https://'), self::WRAPPER_NAME . '://', $this->path);
}
/**
* #return resource
*/
public function getContext()
{
if (!self::$isRegistered) {
stream_wrapper_register(self::WRAPPER_NAME, get_class());
self::$isRegistered = true;
}
return stream_context_create(
array(
self::WRAPPER_NAME => array(
'cb' => array($this, 'read'),
'fileStat' => $this->fileStat,
)
)
);
}
/**
* #param $path
* #param $mode
* #param $options
* #param $opened_path
* #return bool
*/
public function stream_open($path, $mode, $options, &$opened_path)
{
if (!preg_match('/^r[bt]?$/', $mode) || !$this->context) {
return false;
}
$opt = stream_context_get_options($this->context);
if (!is_array($opt[self::WRAPPER_NAME]) ||
!isset($opt[self::WRAPPER_NAME]['cb']) ||
!is_callable($opt[self::WRAPPER_NAME]['cb'])
) {
return false;
}
$this->callBackFunction = $opt[self::WRAPPER_NAME]['cb'];
$this->fileStat = $opt[self::WRAPPER_NAME]['fileStat'];
return true;
}
/**
* #param int $count
* #return mixed|string
*/
public function stream_read($count)
{
if ($this->eof || !$count) {
return '';
}
if (($s = call_user_func($this->callBackFunction, $count)) == '') {
$this->eof = true;
}
return $s;
}
/**
* #return bool
*/
public function stream_eof()
{
return $this->eof;
}
/**
* #return array
*/
public function stream_stat()
{
return $this->fileStat;
}
/**
* #param int $castAs
*
* #return resource
*/
public function stream_cast($castAs)
{
$read = null;
$write = null;
$except = null;
return #stream_select($read, $write, $except, $castAs);
}
}
//$path = 'ftp://ftp.happy.kiev.ua/pub/pictures/ksyu/15.TIF';
//$path = 'ftp://ftp.happy.kiev.ua/pub/pictures/arcwolf1.gif';
//$path = 'ftp://ftp.happy.kiev.ua/pub/pictures/pub_k.pcx';
//$path = 'ftp://ftp.happy.kiev.ua/pub/pictures/9427.jpg';
//$path = 'https://homepages.cae.wisc.edu/~ece533/images/airplane.png';
//$path = '/etc/hosts';
$path = 'http://fc04.deviantart.net/fs71/f/2010/227/4/6/PNG_Test_by_Destron23.png';
echo "File: ", $path, "\n";
$wrapper = new MimeStreamWrapper();
$wrapper->setPath($path);
$fInfo = new finfo(FILEINFO_MIME);
echo "MIME-type: ", $fInfo->file($wrapper->getStreamPath(), FILEINFO_MIME_TYPE, $wrapper->getContext()), "\n";