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Get variable from PHP to JavaScript [duplicate]

I want to use a PHP variable in JavaScript. How is it possible?

Answer*

I think the easiest route is to include the [jQuery][1] javascript library in your webpages, then use [JSON][2] as format to pass data between the two.

In your HTML pages, you can request data from the PHP scripts like this:

 $.getJSON('http://foo/bar.php', {'num1': 12, 'num2': 27}, function(e) {
 alert('Result from PHP: ' + e.result);
 });

In bar.php you can do this:

 $num1 = $_GET['num1'];
 $num2 = $_GET['num2'];
 echo json_encode(array("result" => $num1 * $num2));

This is what's usually called AJAX, and it is useful to give web pages a more
dynamic and desktop-like feel (you don't have to refresh the entire page to communicate
with PHP).

Other techniques are simpler. As others have suggested, you can simply generate the
variable data from your PHP script:

 $foo = 123;
 echo "<script type=\"text/javascript\">\n";
 echo "var foo = ${foo};\n";
 echo "alert('value is:' + foo);\n";
 echo "</script>\n";

Most web pages nowadays use a combination of the two.

 [1]: http://jquery.com/
 [2]: http://json.org/

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2

I think you just confused him. I don't think he was expecting anything nearly that complex.

jdelator
– jdelator

2009年01月06日 09:26:45 +00:00
Commented Jan 6, 2009 at 9:26
Yes, I see your point — maybe he could've tried to explain more what he wanted.

csl
– csl

2009年01月06日 10:40:20 +00:00
Commented Jan 6, 2009 at 10:40
1

I'm not sure including the entire library to use the JSON function is the best way to go. There are a lot of alternatives to jQuery for that particular task.

Salty
– Salty

2009年01月06日 11:58:05 +00:00
Commented Jan 6, 2009 at 11:58
You're right. A lightweight library that just wraps the xml-http talking would be neat.

csl
– csl

2009年01月06日 13:22:42 +00:00
Commented Jan 6, 2009 at 13:22

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Get variable from PHP to JavaScript [duplicate]

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