How can I use a php variable in javascript

Question

If I have created a variable in php, say $test, how can I set a variable in javascript, say var test, to be equal to it.

I have already tried var test = <?php $test ?>

Answer 1

I guess

var test = <?php echo json_encode($test) ?>

The naive way var test = '<?php echo ($test) ?>' will fail if $test contains quotes or newlines, let alone is not of the string type (e.g. array, object)

Answer 2

var test = '<?php echo $test; ?>'

• georg: Try it with $test="bug's".

Answer 3

try like this :

var test = '<?php echo $test ?>';

Answer 4

var test = '<?php echo $test; ?>';

Or using shorthand echos, like this:

var test = '<?= test;?>';

• georg: Try it with $test="bug's".
• Frederik Spang: "Since PHP 5.4.0, <?= is always available." Unless told otherwise, I believe it's safe to assume, atleast PHP 5.4.0 is used.

Answer 5

var test = <?php echo json_encode($test); ?>

Answer 6

You can use

<pre>
var test = '<?php echo $test?>';
</pre>

below the definition of $test.

Answer 7

Change

var test = <?php $test ?>

to

var test = <?php echo $test; ?>

Answer 8

You are missing two things:

var test = <?php $test ?>

1) Echo statement.

2) Single Quotes around PHP snipplet.

So, the corrected code should be:

var test = "<?php echo $test ?>";

• georg: Try it with $test="bug's".
• Pupil: @thg435, please suggest the answer then:)

Answer 9

Within your page where you want your PHP to output to type:

var MyJavascriptVariable = <?php echo $myPHPVariable; ?>

Advise NOT to use short tags () as this can be disabled by webhosts and may break your code.