Examples of using flock to write blocking and non-blocking files in PHP

Explanation on how php uses flock to block writing files and non-blocking writing files:

Blocking writing code: (All programs will wait for the last time The program will not be executed until it is finished and will time out in 30 seconds)

<?php$file = fopen("test.txt","w+");  
$t1 = microtime(TRUE);if (flock($file,LOCK_EX))
{ sleep(10); fwrite($file,"Write something"); flock($file,LOCK_UN); echo "Ok locking file!";
}else{ echo "Error locking file!";
}  
fclose($file);  
$t2 = microtime(TRUE);echo sprintf("%.6f",($t2-$t1));

Code School php

Non-blocking writing code: ( As long as the file is occupied, Error locking file!) is displayed:

<?php$file = fopen("test.txt","a+");  
$t1 = microtime(TRUE);if (flock($file,LOCK_EX|LOCK_NB))
{ sleep(10); fwrite($file,"Write something"); flock($file,LOCK_UN); echo "Ok locking file!";
}else{ echo "Error locking file!";
}  
fclose($file);  
$t2 = microtime(TRUE);echo sprintf("%.6f",($t2-$t1));

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