Repeat line x to y every few second in php - php

Question

how i can repeat code from line x to y in php By Ajax.
for example:
mycode:
$info_2=('<div id="infobox">');
echo $chat_2;
$info_query=mysql_query("SELECT * FROM info WHERE fuid='$uid' or luid='$uid' ");
$info_num=mysql_num_rows($info_query);
for($i=0;$i<$info_num;$i++)
{
$info_fetch=mysql_fetch_array($info_query);
echo($info_fetch['username'].':'.$info_fetch['text'].'<br>');
}
$info_3=('');
echo $info_3;
now i need repeat this code every x second.

Answer 1

One way you can resolve this, is by executing setInterval with an Ajax call.
Somethine like :
<div id="my_container">
</div>
<script>
$(function(){loadContent()}); // first time load content
setInterval(loadContent, 2000); // every 2 seconds (2000 millis)
function loadContent()
{
$.ajax({ url:'/my_content.php',
success(result):{$("#my_container).html(result)},
error(result):{console.log(result.responseText)}})
}
</script>
However, I don't like settings intervals because it does not take into account the server time.
So this is how I would do it (pseudo code):
<div id="my_container">
<!-- include content from 'my_content.php' -->
</div>
Now for "my_content.php".
<!--- some HTML content -->....
<script>
setTimeout(function(){$.ajax({ url:'/my_content.php',
success:function(result){ $("#my_container").html(result);},
error:function(result){ console.log(result.responseText);}
}})},2000) // 2 seconds since last result
</script>
This way this piece of code is "self contained" and only requires it to be wrapped with "my_container" element.