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flock function

hamza somai
hamza somai asked
on
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Last Modified: 2016-10-22
i saw this code in a book and i didn t understand why flock is being used . and when we use it isn t it like this  
(flock($file1, LOCK_EX)) ???

<?php
$idfile=fopen("connex.txt","a");
$date=time();;
flock($idfile,2);
fwrite($idfile,$date);
flock($idfile,3);
fclose($idfile);
//Lecture des données
$idfile=fopen("connex.txt","r");
flock($idfile,1);
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