How to concatenate PHP variable with JavaScript Variable? Is it possible?

Question

Java Script Code:

<script type="text/javascript">
        $(function () {
         var  seatNo = 2;                                                       
         str.push('<a title="' + seatNo + '">' + '<?php echo $thisPacket["seat"]; ?>'</a>');
         }); 
</script>

I want to concatenate between $thisPacket["seat"] with java Script variable seatNo.
Just like php concate. example: $i = 1; $thisPacket["seat".$i];

possible duplicate of [how to put javascript variable in php echo](http://stackoverflow.com/questions/10853630/how-to-put-javascript-variable-in-php-echo) or [Access a JavaScript variable from PHP](http://stackoverflow.com/questions/2338942/access-a-javascript-variable-from-php) or of you meant otherwise echoing PHP into jS see [Pass a PHP string to a Javascript variable (and escape newlines)](http://stackoverflow.com/questions/168214/pass-a-php-string-to-a-javascript-variable-and-escape-newlines?rq=1) — metadings, Jul 25 '13 at 06:35
This is a common misconception for novices because Javascript code and PHP code can co-exist in the same file. However, PHP executes _before_ HTML and Javascript is sent to the browser. Therefore you can't use Javascript variables in a PHP variable. You _can_ use the result of PHP variables in Javascript variables however. — Herbert, Jul 25 '13 at 07:05

score 1 · Accepted Answer · answered Jul 25 '13 at 06:35

I want to concatenate between $thisPacket["seat"] with java Script variable seatNo. Just like php concate. example: $i = 1; $thisPacket["seat".$i];

No, this won't work because the PHP code runs on the server, and the javascript variable seatNo is not available until the javascript code executes on the client.

score 1 · Answer 2 · answered Jul 25 '13 at 06:45

Your best bet is to serialize $thisPacket as a JSON object and send that to the client:

<script type="text/javascript">
        var thePacket = <?=json_encode($thisPacket);?>;
        $(function () {
        var  seatNo = 2;                                                       
            str.push('<a title="' + seatNo + '">' + thePacket['seat'+seatNo] + '</a>');
         }); 
</script>

But im guessing that you should really reconsider your current design.

frogatto · Answer 3 · 2016-08-28T07:21:57.127

0

No this is impossible, because JavaScript is a client-side language and will be executed after that all PHP commands was executed in the server and the page completely rendered. But PHP is a server-side language and is execued before any JavaScript code is interpreted.

edited Aug 28 '16 at 07:21

answered Jul 25 '13 at 06:30

frogatto

28,539
11
83
129

1

So displaying HTML is also not possible, because HTML is client-side, and PHP server-side – vladkras Jul 25 '13 at 06:38
@vladkras: No, The main duty of PHP is `HTML Rendering` and `HTTP Handling`, So PHP can manipulate html when it is rendering a page – frogatto Jul 25 '13 at 06:42
the main duty is to be _general-purpose scripting language that is especially suited to web development_ you can render JS as well and even generate it on fly – vladkras Jul 25 '13 at 06:48
@vladkras: At this step you're right, But i think you did not read my answer carefully, My mean in this answer is **Access to content of JS variables is impossible while PHP is rendering**, Okay? – frogatto Jul 25 '13 at 06:52
I get what you're saying. I think @vladkras had a problem with _how_ you said it. :) – Herbert Jul 25 '13 at 07:07

score 0 · Answer 4 · answered Jul 25 '13 at 06:44

0

take you php variable and assign it to javascript variable than concatenate them.

var phpVar = '<?php echo $thisPacket["seat"]; ?>';
var seatNo =  2;
var conVar = seatNo + phpVar;

I hope this will work

answered Jul 25 '13 at 06:44

Mohammad Ismail Khan

641
3
7

score -1 · Answer 5 · answered Jul 25 '13 at 06:28

-1

this should work

<script type="text/javascript">
        $(function () {
        var  seatNo = 2;                                                       
            str.push('<a title="' + seatNo + '"><?php echo $thisPacket["seat"]; ?></a>');
         }); 
</script>

answered Jul 25 '13 at 06:28

freshp

525
5
20

Yes, I know, but my problem is, I want to concatenate between $thisPacket["seat"] with java Script variable seatNo. Just like php concate. example: $i = 1; $thisPacket["seat".$i]; – sami Jul 25 '13 at 06:32
You only can concatenate a javascript variable with a php variable, but in the other direction it is impossible. – freshp Jul 25 '13 at 06:36

How to concatenate PHP variable with JavaScript Variable? Is it possible?

5 Answers5