Menu
My web server is acting wierd. It seems like it executes scripts (PHP) twice before sending then to apache.
I've run this file:
<?php
echo '<pre>';
session_start();
$_SESSION['index']++;
echo '<br>';
print_r($_SESSION);
?>
And I know that ++ will give a notice at first, but it's just to investigate if it runs twice. Anyway, the printed session shows that the index-index increases by two each time you load the page.
The webserver is apache2, php5 installed on a debian unit.
Anyone has any ideas?
989
Of course it is possible to add a cron job and then delete it after the job has been executed once, but it is not a very good method. To run a PHP script at a given time only once, use the Linux's at command. at schedules a job to be executed only once.
Broadly speaking, the PHP interpreter goes through four stages when executing code: Lexing. Parsing. Compilation.
PHP interpreter is always sequential and it never executes code in parallel. In Chapter 9, Multithreaded and Distributed Computing with pthreads and Gearman, we'll use PHP module pthreads that makes it possible to run PHP code in multiple threads, but we'll see that it's not as simple as it seems.
The exit() function in PHP is an inbuilt function which is used to output a message and terminate the current script. The exit() function only terminates the execution of the script. The shutdown functions and object destructors will always be executed even if exit() function is called.
echo '<pre>'; //Headers and cookies already sent.
session_start(); //Cannot set cookie anymore, system tries again, I guess
Start session first, then output anything.
Try placing session_start(); on top
154
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
