send and retrieve key-value pair between php and jquery ajax? -

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I use $ .get to run the php file I added key-value to jquery from php-file How can I send (like variables)? And when sent, how can I get them with jquery? I want to validate as if (key == value) in jquery

And what's the difference between $$ .getJSON and $? Can not I use $$ .getJSON if I want to run PHP?

I tried to use the php file: 

  echo '{"url": 1}'; I also tried:  
  $ json ['url'] = 2; Echo json_encode ($ json);  
 
 and I use the jquery file: 
 
  warning (data.url);  
 
 But this did not work, it displayed "undefined". 
 
 What's wrong

You can use it with PHP. Javascript: 

  $ (function () {$ .getJSON ("/ some / script.php", function (data) {warning (data.url);})}};

On the PHP side usage:

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