PHP implementation to obtain FLV file Time, _ PHP Tutorial

PHP implementation to obtain the FLV File time ,. How long does PHP obtain the FLV file? How does PHP obtain the FLV file Time? the answer is to view the FLV file is HEX data after the fopen file and convert it to number. Copy the code as follows: phpfunct PHP time for obtaining FLV files,

How does PHP obtain the FLV file Time? the answer is that the FLV file is HEX data after the fopen file is viewed and converted to number.

The code is as follows:

<? Php
FunctionBigEndian2Int ($ byte_word, $ signed = false)
{
$ Int_value = 0;
$ Byte_wordlen = strlen ($ byte_word );
For ($ I = 0; $ I <$ byte_wordlen; $ I ++ ){
$ Int_value + = ord ($ byte_word {$ I}) * pow (256, ($ byte_wordlen-1-$ I ));
}
If ($ signed ){
$ Sign_mask_bit = 0x80 <(8 * ($ byte_wordlen-1 ));
If ($ int_value & $ sign_mask_bit ){
$ Int_value = 0-($ int_value & ($ sign_mask_bit-1 ));
}
}
Return $ int_value;
}

FunctiongetTime ($ name)
{
If (! File_exists ($ name )){
Return;
}
$ Flv_data_length = filesize ($ name );
$ Fp = @ fopen ($ name, 'RB ');
$ Flv_header = fread ($ fp, 5 );
Fseek ($ fp, 5, SEEK_SET );
$ Frame_size_data_length = BigEndian2Int (fread ($ fp, 4 ));
$ Flv_header_frame_length = 9;
If ($ frame_size_data_length> $ flv_header_frame_length ){
Fseek ($ fp, $ frame_size_data_length-$ flv_header_frame_length, SEEK_CUR );
}
$ Duration = 0;
While (ftell ($ fp) + 1) <$ flv_data_length ){
$ This_tag_header = fread ($ fp, 16 );
$ Data_length = BigEndian2Int (substr ($ this_tag_header, 5, 3 ));
$ Timestamp = BigEndian2Int (substr ($ this_tag_header, 8, 3 ));
$ Next_offset = ftell ($ fp)-1 + $ data_length;
If ($ timestamp> $ duration ){
$ Duration = $ timestamp;
}
Fseek ($ fp, $ next_offset, SEEK_SET );
}
Fclose ($ fp );
Return $ duration;
}

Functionget_flv_file_time ($ time)
{
$ Time = getTime ($ time );
$ Num = $ time;
$ Sec = intval ($ num/1000 );
$ H = intval ($ sec/3600 );
$ M = intval ($ sec % 3600)/60 );
$ S = intval ($ sec % 60 ));
$ Tm = $ h. ':'. $ m. ':'. $ s;
Return $ tm;
}

?>

Use get_flv_file_time ("your FLV. flv") directly.

Finally, how does PHP get the FLV file Time? the answer is that after the fopen file is viewed, the FLV file is HEX data and converted to number. The code is as follows: php funct...