-
-
/**
- * PHP取二进制文件头快速判断文件类型
- *
- * @param 文件 $file
- * @return string
- * @author lrenwang
- * @blog blog.lrenwang.com
- */
- function get_extname($file)
- {
- $fp = fopen($file, "rb");
- $bin = fread($fp, 2); //只读2字节
- fclose($fp);
- $bin_info = @unpack("C2chars", $bin);
- $code = intval($bin_info['chars1'].$bin_info['chars2']);
- switch ($code) {
- case 7790:
- $type = 'exe';
- break;
- case 7784:
- $type = 'midi';
- break;
- case 8075:
- $type = 'zip';
- break;
- case 8297:
- $type = 'rar';
- break;
- case 255216:
- $type = 'jpg';
- break;
- case 7173:
- $type = 'gif';
- break;
- case 6677:
- $type = 'bmp';
- break;
- case 13780:
- $type = 'png';
- break;
- default:
- $type = $code;
- break;
- }
- return $type;
- }
- ?>
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