why does this script show empty alert box. I am trying to use php value in javascript
<script type="text/javascript">
alert(<?php echo count($myorder) ?>); </script>
Probably because you are not encapsulating the PHP output into quotes (JavaScript should give you an error on that?), and the echo statement is missing a mandatory optional semicolon.
Try
<script type="text/javascript">
alert("<?php echo count($myorder); ?>"); </script>
remove the javascript - and just echo the variable to the screen, what does the value show?
looking at the sample, even though as the previous answer mentioned you missed the ; at the end of the echo, and you didn't quote the alert, it still actually works at least in firefox and IE8. The count should always return a value even on a null value or a non-array, so not 100% sure but would be interested to see what it shows in php only.
just for sanity sake try this....
<?php echo "before | " . count($myorder) . " | after";?>
and what is the output....
if the value is not an array, is null, or is an array with zero entries it should be
before 0 after
and if it has elements it would be whatever the count is, obviously.