Example1:Assign value to php variable using javascript variable.

//Put this code in body of page

<?php $myvar=1; ?>
<script type="text/javascript">
jsvar = 3;

//Assign jsvar javascript variable value to php variable $myvar
'<?php $myvar="<script>document.write(jsvar)</script>"; ?>';
</script>

<?php echo $myvar; ?>

Example 2: Assign javascript counter variable to php variable

<script type="text/javascript">
var counter = 0;
for(i=0;i<10;i++){
counter++;
}
</script>

<?php
$x= "<script>document.write(counter)</script>";
echo $x;
?>

Example 3: Convert php array to javascript array

<?php

/* Conver PHP Array to JAVASCRIPT Array */
function P2JArray($PhpArray,$JA)
{
print "<script>var ".$JA." = Array();</script>";
for($i=0;$i<count($PhpArray);$i++){
print "<script>".$JA."[".$i."]='".$PhpArray[$i]."'</script>";
/*print "<script>alert(".$JA."[".$i."]);</script>";*/
}
}

$numbers = array("one","two","three","four");
P2JArray($numbers, 'js_num');
?>

<script type="text/javascript">
for(i =0; i<js_num.length;i++)
{
alert(js_num[i]);
}
</script>