set a Javascript variable with PHP

Question

I am trying to write a game where you roll the dice and get half a quote and you have to guess if it matches the half that you were originally given. I am using AJAX and everything works fine right up until the end when I send a variable from php to javascript using

echo  '<script>currentQuote = $currentQuote;</script>';

It shows up on the page but when I check the value of currentQuote in JS it is undefined. Here is a link to a simplified version of the game just showing my problem.http://workwithu.com/Games/Game15snip.php The PHP code which you cannot see is:

<?php
$response = mt_rand(1,6);
echo $response;
$currentQuote=$response;
echo '<script>currentQuote = $currentQuote;</script>';//this not working
echo "<br>";
echo "currentQuote is:";
echo $currentQuote; //this shows on the screen fine
?>

Any help would be GREATLY appreciated. I have run out of ideas to try. Thanks

Read that wondefull article please: stackoverflow.com/help/formatting — idmean
– idmean, Commented Oct 24, 2013 at 19:44

Marc B · Accepted Answer · 2013-10-24 19:45:14Z

4

Basic PHP syntax. '-quoted strings do NOT interpolate variable values. If you do a view source on your page, you'll see a literal

<script>current Quote = $currentQuote</script>

in the page's source. Switch to a "-quoted string:

echo "<script>currentQuote = $currentQuote;</script>";//this not working
     ^---note                                       ^---note

answered Oct 24, 2013 at 19:45

Marc B

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2 Comments

Kai Qing Over a year ago

Also factor that $currentQuote may be a string, which could resolve to currentQuote = Some string that will break js; - btw I see it is a result of mt rand, but in general the comment is for anyone else, not you Marc B.

Peter Over a year ago

OK, I tried using double quotes and still got currentQuote=undefined. Maybe I should have mentioned that the PHP is coming from two files on the server via Ajax and I am trying to store what I get from the first response to pass via Javascript to the next file using Ajax.Maybe I can only use one PHP file and have to store all the values in there, but everything I read says that a variable can be stored with Javascript using <?php echo and although it show on the page it is not being stored so I can use it.

Manwal · Accepted Answer · 2013-10-24 19:49:55Z

0

if you are using ' -Quoted sting you should use.

echo '<script>currentQuote = '.$currentQuote.';</script>';

or use " -quoted

echo "<script>currentQuote = $currentQuote;</script>";

answered Oct 24, 2013 at 19:49

Manwal

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