PHP While loop stops after two hours

Question

I have the following script, that loops every 60 seconds. All works fine, but after two or three hours the script stops. I have no idea why.

<?php

// The worker will execute every X seconds:
$seconds = 60;

// We work out the micro seconds ready to be used by the 'usleep' function.
$micro = $seconds * 1000000;

while(true){

    try {
        $url = 'URL';
        $fields = array(
            "hi"=> 1,
            "world"=> 2,
        );
        //url-ify the data for the POST
        foreach($fields as $key=>$value) { $fields_string .= $key.'='.$value.'&'; }
        $fields_string = rtrim($fields_string,'&');

        $ch = curl_init();
        curl_setopt($ch,CURLOPT_URL,$url);
        curl_setopt($ch,CURLOPT_POST,count($fields));
        curl_setopt($ch,CURLOPT_POSTFIELDS,$fields_string);
        curl_exec($ch);

    } catch (Exception $e) {
        $myFile = "/usr/share/test/filephp.txt";
        $fh = fopen($myFile, 'a') or die("Can't open file");
        $stringData = "File updated at: " . time(). "\n";
        fwrite($fh, $stringData);
        fclose($fh);
    }




    // Now before we 'cycle' again, we'll sleep for a bit...
    usleep($micro);
}

The PHP script is executed with this command:

sudo -u root php -f /usr/share/test/test.php &

Any ideas?

PHP will stop executing after a predetermined time unless you run it as a daemon — John Conde
– John Conde, Commented Mar 23, 2017 at 17:42
It's probably because of max_execution_time setting. But why don't you just run it as a cron job instead of a continuous loop? — Barmar
– Barmar, Commented Mar 23, 2017 at 17:42
Running this is as root is a bit of a code smell. That shouldn't be necessary. — Alex Howansky
– Alex Howansky, Commented Mar 23, 2017 at 17:45

Steve Harris · Accepted Answer · 2017-03-23 17:57:01Z

1

You could wrap it in a bash script and remove the while loop altogether.

Script "wrapper":

#!/bin/bash

SECONDS=60
while [ 1 ]; do
    php -f /usr/share/test/test.php
    sleep $SECONDS
done

Then just call that script:

sudo -u root wrapper &

answered Mar 23, 2017 at 17:57

Steve Harris

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2 Comments

Steve Harris Over a year ago

It is as stable as it gets. You may need to use "nohup" to keep it from hanging up when the user session ends.

Marcos Aguayo Over a year ago

It's working. Thanks! I added "&" just after the "done"

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