html5上传图片时可用php://input的数据流来运作.
如果要得到图片信息,那只有getimagesize($filename),再打一次刚关闭的文件.
php里有一个getimagesizefromstring,但是要>=php5.4,但目前还没服务器还没用上这么高版本的php.
作为一个效率癖,这是不被允许的,有直接操纵数据流的方法吗?
当然, stream_register_wrapper — 注册一个用 PHP 类实现的 URL 封装协议
php代码
class getImgStream{ private $imgStream; private $position; function stream_open($path, $mode, $options, &$opened_path){ $url = parse_url($path); $this->imgStream = $GLOBALS[$url["host"]]; $this->position = 0; return true; } function stream_read($count){ $ret = substr($this->imgStream, $this->position, $count); $this->position += strlen($ret); return $ret; } function stream_stat(){ //maxmemory: 5 * 1024 * 1024; $fp = fopen("php://temp/maxmemory:5242880", 'r+'); fwrite($fp, $this->imgStream); $fstat = fstat($fp); fclose($fp); return $fstat; } function stream_eof(){ return $this->position >= strlen($this->imgStream); } function stream_tell(){ return $this->position; } function stream_seek($offset, $whence){ $l = strlen($this->imgStream); $p = &$this->position; switch($whence){ case SEEK_SET: $newPos = $offset; break; case SEEK_CUR: $newPos = $p + $offset; break; case SEEK_END: $newPos = $l + $offset; break; default: return false; } $ret = ($newPos >= 0 && $newPos <= $l); if($ret) $p = $newPos; return $ret; } function stream_close(){ unset($this->imgStream, $this->position); } } $file_path = 'http://www.baidu.com/img/shouye_b5486898c692066bd2cbaeda86d74448.gif'; $stream = file_get_contents($file_path); stream_wrapper_register("image", "getImgStream"); print_r(getimagesize('image://stream')); $new_img = imagecreatefromgif('image://stream'); //或者 $new_img = imagecreatefromstring($stream); print_r($new_img); imagejpeg($new_img, 'E:\WEB\uploads\test.jpg', 100);
方法二
$file_path = 'http://www.baidu.com/img/shouye_b5486898c692066bd2cbaeda86d74448.gif'; $stream = file_get_contents($file_path); print_r(getimagesize("data://text/plain;base64," . base64_encode($stream))); $new_img = imagecreatefromgif("data://text/plain;base64," . base64_encode($stream)); //或者 $new_img = imagecreatefromstring($stream); print_r($new_img); imagejpeg($new_img, 'E:\WEB\uploads\test.jpg', 100);