将值传递给脚本中的PHP变量

Question

I have some PHP code inside the script so I need the JavaScript value as a PHP variable, as follows:

<script>
;
 var js_var = 123;
 var php_var = <?php js_var ?>;
 alert(php_var);
;
</script>

Using jQuery to send the value to a PHP page will return the value but not as a PHP variable:

$.get("page.php", {js_var_name: js_var}, function(data) {alert(data)});

I tried also all jQuery AJAX functions: load(), post() and the ajax() method, none of them pass back the value of PHP as above requested.

Is it possible to implement the above with jQuery?

Answer 1

Likely you have a syntax issue with :

var php_var = <?php js_var ?>;

Unless you used define() your php variable should start with $ and you need to echo it so that it gets printed to the page

var php_var = <?php echo $js_var ?>;

If you are assuming that php will read the prior javascript js_var=123 it won't. Javscript is a client side language and php is server side.