PHP implementation gets the FLV file time _php instance

How PHP Gets the flv file time, the answer is fopen file after viewing the FLV file is hex data and converted to number.

Copy CodeThe 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{$i}) *pow ($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;
}

?>

Just use Get_flv_file_time ("Your flv.flv").

