Scripts Waits Until Complete Before Displaying Results

[TripleDES]

Very simple script.  When executed from CLI, I get desired response.  Each character is displayed while it iterates.  ie. 1..2..3  However, when running this script through a browser, it waits before the script completes before displaying 123.  Any ideas why?  Someone in a PHP newsgroup mentioned possible output buffering enabled.  I since disabled this, but still seem to get the same issue.

 

<?php
while($i++<3) {
    print($i);
    sleep(2);
}
?> 

[AndyB]

'waits until it completes ...' - exactly how php normally works.  The script executes on the server and when completed (including the sleeps) the output is sent to the (viewer's) browser to be rendered.

[dj-kenpo]

PHP is not C++. as ANdy said, it's doing what PHP does, ther eis no workaround, you want flash or javascript, not php

[AndyB]

Actually, there is a 'workaround' - but it's really a normal part of php so calling it a workaround isn't right.  flush

 

Give this a test:

 

<?php
ob_start();
for ($i=1;$i<10;$i++) {
echo $i. "<br/>";
sleep(1); // pause 1 second
ob_flush();
flush();
}
?>

 

 

[TripleDES]

Thanks for the quick response.  So how do I defer from this default behavior?

 

Here's what I'm going with this script.  I want to form a ping script that will ping x host x times.  Let's say I want to ping 4.2.2.2 20 times.  I would like a running output:

 

PING 4.2.2.2 (4.2.2.2) 56(84) bytes of data.

64 bytes from 4.2.2.2: icmp_seq=1 ttl=247 time=139 ms

64 bytes from 4.2.2.2: icmp_seq=2 ttl=247 time=147 ms

64 bytes from 4.2.2.2: icmp_seq=3 ttl=247 time=168 ms

64 bytes from 4.2.2.2: icmp_seq=4 ttl=247 time=143 ms

...etc.

 

Currently, the user must wait until the script is complete to see the entire output.

[TripleDES]

PHP is not C++. as ANdy said, it's doing what PHP does, ther eis no workaround, you want flash or javascript, not php

 

hmm...no workaround?  that's unfortunate. 

[AndyB]

um, did you try the code I posted??

[TripleDES]

um, did you try the code I posted??

 

Apologies, I posted before seeing your response.  See my partial script below.  The location of the output buffering essentially has an artificial effect of what I'm trying to do.  The script actually completes, but then has a 1 second delay before displaying each line.

 

if (preg_match("$regex", $ping_ip_addr) OR preg_match("$regex2", $ping_ip_addr)) {
         exec($ping, $result);
         ob_start();

foreach($result as $val) {
       print "$val<br>";
       sleep(1);
       ob_flush();
       flush();
  }

[TripleDES]

I was able to get output buffering working as expected with other scripts.  However, it seems when I try to run an external program such as ping, PHP waits until the command completes before releasing any output.

 

$ping = "ping -i .25 -c $ping_count -s $ping_size $ping_ip_addr";

 

I've tried exec(), passthru() and plan 'ping x.x.x.x' to no avail.  Any other suggestions?

[TripleDES]

Anyone else want to take a crack at this?