Get PHP variable with JavaScript

[sseeley]

If I have a value $test in PHP how can I get this value using Java script, I would like to use this is a form validation?  Many thanks in advance?

[roopurt18]

When you generate the page from PHP, include this in the output:

 

<?php
echo sprintf( '<input type="hidden" name="hdnTest" id="hdnTest" value="%s" />', htmlentities( $test, ENT_QUOTES ) );
?>

 

If $test has 'Hello World' in it, then that should output:

<input type="hidden" name="hdnTest" id="hdnTest" value="Hello World" />

 

Then in JavaScript you can:

alert( document.getElementById( 'hdnTest' ).value );