PHP Loops

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bigzee

Hey!

I'm fairly new to php, and I wanted to create a form where if they pressed a button, a loop would start, and it would only stop when they either exited the page, or hit a stop button. I'm not sure how to go about doing this, any advice/help?

ssdog

Can you more specific? What that loop should do?

ssdog

try something like this:
put this in a php file

<?php 
$running_ps       = shell_exec('ps -afx | grep php');//get the php processes

if(preg_match_all('/([0-9]+)(.*?)php (201)/', $running_ps, $a_matches)) {//identify the proces you need
    foreach ($a_matches[1] as $key => $value) {
        $a_running_proc = $value;
    }
}
if (isset($_REQUEST['action'])) {

if($_REQUEST['action'] == '0' ) {

    //stop the process
    proc_close(proc_open('kill '. $a_running_proc, array(), $foo));//kill the process
}
    else
    {
        //do whatever you want to do
        //then start the process again
        proc_close(proc_open("php [script_file_name] 201 &", array(), $foo));//run the process in background

    }

?>

and here is the html

<html>
<body>
<a href="[script_file_name]?action=1"><button>Start</button></a>
<a href="[script_file_name]?action=0"><button>Stop</button></a>
</body>
</html>

bigzee

ssdog;1256907 wrote:
try something like this:
put this in a php file
<?php 
$running_ps       = shell_exec('ps -afx | grep php');//get the php processes

if(preg_match_all('/([0-9]+)(.*?)php (201)/', $running_ps, $a_matches)) {//identify the proces you need
    foreach ($a_matches[1] as $key => $value) {
        $a_running_proc = $value;
    }
}
if (isset($_REQUEST['action'])) {

if($_REQUEST['action'] == '0' ) {

    //stop the process
    proc_close(proc_open('kill '. $a_running_proc, array(), $foo));//kill the process
}
    else
    {
        //do whatever you want to do
        //then start the process again
        proc_close(proc_open("php [script_file_name] 201 &", array(), $foo));//run the process in background

    }

?>
and here is the html
<html>
<body>
<a href="[script_file_name]?action=1"><button>Start</button></a>
<a href="[script_file_name]?action=0"><button>Stop</button></a>
</body>
</html>

If I did this to the else statement:

        else 
        { 
$i = 0;
echo $i;

        proc_close(proc_open("php [script_file_name] 201 &", array(), $foo));//run the process in background

    }

Would that continue to send the email until someone hits stop? If so, at what delay? If not, how can I make it do that?

bigzee

I mean would it continue to echo the variable?

ssdog

Yes, it sends until someone stops it, but be carefull: IF YOU CLOSE THE BROWSER, YOU DON'T STOP THE PROCESS
As about delays, it doesn't have any delay...send the email, then runs the process again.
If you want to add a delay, you can put the script to sleep by doing this:

else  

        {  

$i = 0; 
echo $i; 
            sleep([int_value]);
            proc_close(proc_open("php [script_file_name] 201 &", array(), $foo));//run the process in background 

    }

ssdog

Yet...you won't be able to see that this works by echoing, because it is a process, so it won't refresh your web page...you should write those values into a file or a DB.

bigzee

ssdog;1256949 wrote:
Yet...you won't be able to see that this works by echoing, because it is a process, so it won't refresh your web page...you should write those values into a file or a DB.

How would i check if the script is already running? As in if i want a field on.the first webpage that says "Script status: Running/not running"

ssdog

you could do something like

<?php  

$running_ps       = shell_exec('ps -afx | grep php');//get the php processes 

if(preg_match_all('/([0-9]+)(.*?)php (201)/', $running_ps, $a_matches)) {//identify the proces you need 
    foreach ($a_matches[1] as $key => $value) { 
        $a_running_proc = $value; 
    } 
} 
if (isset($_REQUEST['action'])) { 

if($_REQUEST['action'] == '0' ) { 

    //stop the process 
    proc_close(proc_open('kill '. $a_running_proc, array(), $foo));//kill the process 
   echo "process stopped";
    require('html_file_name');
} 
    else 
    { 
        //do whatever you want to do 
        //then start the process again 
        proc_close(proc_open("php [script_file_name] 201 &", array(), $foo));//run the process in background 
       echo "process running";//print this text before showing buttons
       require('html_file_name');//this will show those buttons

    } 
}
?>

ssdog

but if you want to do this check when you first enter the page, yoiu should change the html file, make it php and add this:

<html>
<body>
<?
$running_ps       = shell_exec('ps -afx | grep php');//get the php processes 

if(preg_match_all('/([0-9]+)(.*?)php (201)/', $running_ps, $a_matches)) 
                                             {
                                                  echo "running";
                                               }
              else {
                        echo "not running";
                       }
} ?>
<a href="[script_file_name]?action=1"><button>Start</button></a>
<a href="[script_file_name]?action=0"><button>Stop</button></a>
</body>
</html>

but if you do this, there is no need to change the php as described in the post above...you could just call header('Location:[button_file]'); instead of echo and require()