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

<code><span><span><?php</span>
set_time_limit(<span>0</span>);

<span>$starttime</span> = time();

<span>$fh</span> = fopen(<span>$filename</span>,<span>'w'</span>);

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

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

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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.