javascript - How I can POST a Button value in PHP -

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i have form in use multiple checkbox. on checkboxes use javascript validation if checked checkbox, proceeds ahead otherwise show alert message. code working well

problem because have 2 button on form , have different functionality. want post value of button on action page

my code goes here

<script> function letter_submit(){   var pr = document.getelementsbyname('pr'),       = 0;   var allarechecked = true;   for( ; < pr.length; i++ )   {     if( pr[i].checked=='' ) {       allarechecked = false;     }   }   if (!allarechecked) {     alert("please check checkboxes");     exit;   } else {     alert("all ok");     document.getelementbyid("approve_letter").submit();    } }     </script>   <form action="letter_approve_action.php" id="approve_letter" name = "approve_letter" method="post" >  <input type="checkbox" name="pr" id="pr" value="" /> nl appropriately addressed.  </br>  <input type="checkbox" name="pr" id="pr" value="" /> checked press release   </br>   <input type="checkbox" name="pr" id="pr" value="" /> applicable methodology rightly marked  </br>   <input type="checkbox" name="pr" id="pr" value="" /> respective sector study on website updated within last 12 months.  </br>  <button type="button" name="btn_submit" id="btn_submit" value="approve" onclick="letter_submit();">approve</button>  <button type="button" name="btn_submit" id="btn_submit" value="re - submit" />re-submit</button>  </form>

on action page use

echo $submit = $_post ['btn_submit'];

and got error

notice: undefined index: btn_submit in c:\xampp\htdocs\work_que_backup\login\pacra-all\w_q\nl\letter_approve_action.php on line 26

you may use <button> tag.

for example:

<form method="post">      <input type="text" name="mytext" value="some text here..."/>      <button type="submit" name="mybutton" value="buttonvalue">submit</button> </form>

the label tht displayed "submit" can access button value server different value.

it accessible php on server side as:

echo $_post['mybutton']; //buttonvalue

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