PHP generates millions of UIDs and stores them in files

This is a question asked in a group today. The main reason is that writing files takes a long time.

I am doing an experiment here. Every 20,000 UIDs are written into a file. One file is written approximately 280kb, so the overall writing time is only 13S

Post the code

set_time_limit(0);

$starttime = time();

$fh = fopen($filename,'w');

for($i=0;$i<1000000;$i++)
{
    $uid = uniqid();
    if($i%20000 == 0) 
    {
        $filename = $i.'.txt';

    }
    fwrite($fh,$uid.' ');
}
$endtime = time();
echo'总用时:'.($endtime-$starttime).'s';
?>

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The above introduces PHP to generate millions of UIDs and save them in files, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.