PHP如何检查文件是mp3还是图像文件？

Question

除了检查每个可能的扩展名外，我如何检查文件是mp3文件还是图像文件？

Answer 1

您可以使用来识别图像文件getimagesize。要查找有关MP3和其他音频/视频文件的更多信息，建议使用php-mp4info getID3（）。

Answer 2

获取模仿类型的本机方法：对于PHP <5.3，请使用mime_content_type（）对于PHP> = 5.3，请使用finfo_fopen（）获得MimeType的替代方法是exif_imagetype和getimagesize，但是这些方法依赖于安装适当的库。此外，它们可能仅返回图像模仿类型，而不是magic.mime中给出的整个列表。如果您不想打扰系统上可用的功能，只需将所有四个函数包装到一个代理方法中，该方法将函数调用委托给任何可用的方法，例如function getMimeType($filename){&nbsp; &nbsp; $mimetype = false;&nbsp; &nbsp; if(function_exists('finfo_fopen')) {&nbsp; &nbsp; &nbsp; &nbsp; // open with FileInfo&nbsp; &nbsp; } elseif(function_exists('getimagesize')) {&nbsp; &nbsp; &nbsp; &nbsp; // open with GD&nbsp; &nbsp; } elseif(function_exists('exif_imagetype')) {&nbsp; &nbsp; &nbsp; &nbsp;// open with EXIF&nbsp; &nbsp; } elseif(function_exists('mime_content_type')) {&nbsp; &nbsp; &nbsp; &nbsp;$mimetype = mime_content_type($filename);&nbsp; &nbsp; }&nbsp; &nbsp; return $mimetype;}

Answer 3

要查找文件的mime类型，请使用以下包装函数：function Mime($path){&nbsp; &nbsp; $result = false;&nbsp; &nbsp; if (is_file($path) === true)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; if (function_exists('finfo_open') === true)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $finfo = finfo_open(FILEINFO_MIME_TYPE);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (is_resource($finfo) === true)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $result = finfo_file($finfo, $path);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; finfo_close($finfo);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; else if (function_exists('mime_content_type') === true)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $result = preg_replace('~^(.+);.*$~', '$1', mime_content_type($path));&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; else if (function_exists('exif_imagetype') === true)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $result = image_type_to_mime_type(exif_imagetype($path));&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; return $result;}