PHP Loops

**bigzee** · 03-20-2013, 10:45 PM

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** · 03-21-2013, 08:05 AM

Can you more specific? What that loop should do?

**ssdog** · 03-21-2013, 08:47 AM

try something like this:
put this in a php file

PHP Code:


<?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 Code:

<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** · 03-21-2013, 09:28 AM

Originally Posted by ssdog

try something like this:
put this in a php file

PHP Code:


<?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 Code:

<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:

PHP Code:


        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** · 03-21-2013, 09:29 AM

I mean would it continue to echo the variable?

**ssdog** · 03-21-2013, 09:35 AM

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:

PHP Code:


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** · 03-21-2013, 10:31 AM

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** · 03-21-2013, 12:21 PM

Originally Posted by 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.

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** · 03-22-2013, 03:06 AM

you could do something like

PHP Code:


<?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** · 03-22-2013, 03:13 AM

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:

PHP Code:


<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()

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