Php cannot play the flv or mp4 files downloaded

Php cannot download flv files or mp4 files. if you want to transmit the flv playback address or mp4 playback address through POST, you can directly download the files. it is easy to download and directly receive POST data. the format of POST data is similar: a. com1.flv, then downloaded through PHP, tested two methods (only... Php cannot play the flv or mp4 files downloaded

If you want to transmit the flv playback address or mp4 playback address through POST and then download it directly, it is very easy to download and directly receive POST data. the format of POST data is similar: http://a.com/1.flv. after PHP is downloaded, the two methods are tested (only simplified code for download is posted ):

Or:

The 1. flv file is successfully downloaded, but cannot be played after the download. you can download the 1. flv file using linux wget http://a.com/1.flv. An error occurs when you directly download the file in PHP:

Comparing the file size, it is found that the file cannot be played three more bytes:

Then the vim editor finds that the file starts with three more bytes, but you do not know how many of them are. you can delete these three bytes to play back the file:

No answers can be found on the Internet .. I really don't know where the problem is. could you help me? =

Solution:

These three characters are the legendary BOM.

You are used to download the php file, the format is UTF-8 with BOM, with Notepad ++ look at it,

Or pull out all your php files and remove them?

/*** Remove the BOM of a string ** @ param string $ str input string * @ return string output string */function removeBOM ($ str) {$ str_2 = substr ($ str, 0, 2); $ str_3 = substr ($ str, 0, 3); // $ str_2. $ str {2}; $ str_4 = substr ($ str, 0, 4); // $ str_3. $ str {3}; if ($ str_3 = pack ('CCC ', 0xef, 0xbb, 0xbf) // UTF-8 return substr ($ str, 3 ); elseif ($ str_2 = pack ('CC', 0xfe, 0xff) | $ str_2 = pack ('CC', 0xff, 0xfe )) // unicode return substr ($ str, 2); elseif ($ str_4 = pack ('cccc', 0x00,0x00, 0xfe, 0xff) | $ str_4 = pack ('cccc', 0xff, 0xfe, 0 x) // UTF-32 return substr ($ str, 4); return $ str ;}

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