CODEWITHSUNDEEP
php
mathew
mathew

Reputation: 1200

How do I control script execution time in PHP

for example I do have 5 PHP functions on a page which execute when loading. each functions has its own processing time and some of them take more time sometimes to complete the task. hence the total loading time of the said page is slow.

my question is how do I control execution time for each script and set time limit for the same. I am aware that there is an in built function in PHP called set_time_limit(); but it gives fatal error if time is beyond the maximum limit...

Upvotes: 2

Views: 2159

Answers (2)

Alix Axel
Alix Axel

Reputation: 154523

The easy way would be to call set_time_limit(0); but that only works if you have safe_mode Off.

My approach to this would be to use register_shutdown_function:

function one() {
    register_shutdown_function('two');
    /* do stuff */
}

function two() {
    register_shutdown_function('three');
    /* do stuff */
}

function three() {
    /* do stuff */
}

one();

This doesn't seem to work with PHP 5.3.1, I guess it's because of the changes implemented in PHP 4.1.0:

The shutdown functions are now called as a part of the request. In earlier versions under Apache, the registered shutdown functions were called after the request has been completed.

An alternative could be the use of pcntl_fork, or you can just issue another request (with file_get_contents for instance), and call ignore_user_abort on the requested scripts.

Upvotes: 1

phsource
phsource

Reputation: 2446

From what your question says, I'm assuming that you have 5 functions in a single PHP file (script), executing, and if one of them executes for too long, it should be skipped.

The only way you can skip functions is to poll the time every once in a while.

function myFunction($someVar) {
    $startTime = time();
    $timeLimit = 10; // Let's say, time limit is 10 seconds
    while ($blah_blah == true) { // Some loop or code that takes a long time
        // Do some work
        if (time() - $startTime > $timeLimit) return; // Time's up!
    }
    // Done
    return;
}

Note that the function will only return at points where it checks if the time's up, and you have to manually place the points where you check if the time's up. This check does have some overhead, so try not to place it everywhere.

Please comment if I misinterpreted your question.

Upvotes: 1

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