PHP responding to ajax when running a long script

Question

I've asked a question at here that answered and working fine,

but my problem is that when script running about more than 4~5 seconds , all ajax requests not working at all until completing running script .

In fact I've using a progress to copy files and when I choose a large file , after 30% process the ajax not working to get percentage of progress .

If you check my question , you will understand what I've saying .

Copy.php

$f = mysql_query(" select * from `process` ");
$f = mysql_fetch_assoc($f);
$total_bytes_readed = $f['total-bytes-readed'];
$total_bytes = $f['total-bytes'];
$abort = $f['state'] == 'abort'?true:false;
$remote = fopen($src, 'r');
$local = fopen($des, 'w');
$filesize = filesize($src);
$d = strtotime(date('Y-m-d H:i:s'));
$B = $speed = $time_remaining = $read_bytes = 0;

while(!feof($remote) && !$abort) {

    $field = mysql_query(" select * from `process` ");
    $field = mysql_fetch_assoc($field);
    if($field['state']=='abort')
    {
        fclose($remote);
        fclose($local);
        if(file_exists($des))
        unlink($des);
        $abort = true;
        return;
    }else{
        $bitrate = 2048*2048;
        $buffer = fread($remote, $bitrate);
        fwrite($local, $buffer);
        $read_bytes += $bitrate ;
        $total_bytes_readed += $bitrate;
        $D = strtotime(date('Y-m-d H:i:s'));        
        if($D-$d >=1)
        {
            $d = $D;
            $speed = $read_bytes - $B;
            $B = $read_bytes;
            $total_bytes_remaining = $total_bytes - $total_bytes_readed;
            $time_remaining = $total_bytes_remaining/$speed;
        }
        mysql_query("UPDATE `process` SET 
                    `total-bytes-readed` = '$total_bytes_readed',
                    `speed` = '$speed',
                    `time-remaining` = '$time_remaining' 
                     WHERE `process`.`id` =1");         
    }
}
fclose($remote);
fclose($local);
mysql_query("UPDATE `process` SET 
            `total-bytes-readed` = '$total_bytes_readed',
            `speed` = '$speed',
            `time-remaining` = '$time_remaining' 
             WHERE `process`.`id` =1");

progress.php

if(isset($_POST['cancel']) && $_POST['cancel']==1)
mysql_query("UPDATE `process` SET `state` = 'abort' WHERE `process`.`id` =1");  

$f = mysql_query(" select * from `process` ");
$f = mysql_fetch_assoc($f);

$re = array('totalfiles'  => $f['total-files'],
            'totalbytes'  => $f['total-bytes'],
            'bytesreaded' => $f['total-bytes-readed'],
            'file'        => $f['file'],
            'from'        => $f['from'],
            'to'          => $f['to'],
            'speed'       => ByteToSize($f['speed'])."/Second",
            'time'        => seconds_to_time($f['time-remaining']),
            'items'       => $f['items-remaining'],
            'state'       => $f['state'],
            );
echo json_encode($re);

JS

setInterval(function(){
    $.post( progress.php,{cancel:cancel_val},
    function(data){
       //...        
    }); 
},300);

in your browser what are the XHR requests returning when it starts to fail? is your copy script hitting it's max execution time, or running out of memory? what do your php error logs say? — cmorrissey
– cmorrissey, Commented Oct 22, 2014 at 15:57
Possibly the same problem as stackoverflow.com/questions/25675304/…, i.e you need to use session_write_close — developerwjk
– developerwjk, Commented Oct 22, 2014 at 16:02

jeroen · Accepted Answer · 2014-10-22 16:04:07Z

0

Without seeing it in action, I would guess that the problem is that you have multiple ajax requests that are overlapping.

Instead of using an setInterval, you should set use a setTimeout in the success function of your ajax call. That way you ensure that there is always only 1 ajax request at most at the same time.

So your javascript would be something like:

function updateProgress() {
    $.post( progress.php,{cancel:cancel_val},
    function(data){
       //... 
       setTimeout(updateProgress, 300);      
    }); 
};

updateProgress();

answered Oct 22, 2014 at 16:04

jeroen

91.8k22 gold badges117 silver badges132 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

jeroen Over a year ago

@Damon.s Any messages in the console?

talkhabi Over a year ago

anythings not working , for example liking posts or comments in other posts because of ajax ...

jeroen Over a year ago

@Damon.s Sounds like a syntax error somewhere, check the console.

talkhabi Over a year ago

nope . I'm sure about this . code running for a few seconds then stop and when copying has been completed the result shown .

jeroen Over a year ago

@Damon.s Are you using sessions?

Collectives™ on Stack Overflow

PHP responding to ajax when running a long script

1 Answer 1

5 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related