如何在wordpress url中传递参数

Question

function signal_adder_form(){
        form_css();
    form_dpicker();
if(isset($_POST['submit'])){
    $da=$_POST['to'];
    $our_date = str_replace( "/", "-", $da);    
}
   echo '<div class="signali">';
   echo '<h1>Add Signal</h1>';
   echo '<form id="form2" name="form2" method="post" action="">';
   echo ' <div class="text">Select Currency</div>';
   echo '<div class="itemi">      ';
   echo ' <div class="labeli"><label for="cur1">From</label></div>';
   echo '<div class="inputis" class="small"><select name="cur1" id="cur1">';
   list_of_currency();
   echo '</select></div>';
   echo '<div class="labeli"><label for="cur2">To Which</label></div>';
   echo '<div class="inputis"><select name="cur2" id="cur2">';
   list_of_currency();
   echo '</select></div>';
   echo '<div class="clear"></div>';
   echo '</div>';
   echo '<div class="text">Date</div>';

}

http://localhost/theme/wp-admin/edit.php?page=addsignal

这是我在wordpress管理员的网址，我想在其中传递一个参数，如

http://localhost/theme/wp-admin/edit.php?page=addsignal&add=true

我是这项工作的新手，所以我不知道如何实现它

---

还告诉我，当我有编辑页面时，我将如何实现我在php中编辑链接

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