javascript - Not able to access PHP variable -


i struggling/trying since last 24 hours simple thing, not able understand why not able access php variable. know doing wrong , have no idea what's that.. 

window.alert("variable" + <?php  echo $_post; ?> );

its giving me output function array() {[native code]}, how can print values ? , think post attribute blank, can check ? why post variable blank ?

i sending data file via post method 

<script type="text/javascript"> function callajaxaddition() {     arguments0 = {         arg1: $("#exampleform input[id='pac-input']").val(),         arg2: ("#exampleform input[id='pac-input']").val()     };     $.ajax({         type: "post",         url: "processajax.php",         data: {             arguments: arguments0         },         success: function(data) {             $("#answer").html('<ul><li>' + data + '</li></ul>');             send_apptn_req();         }     });     return false; } </script>

and processajax.php file is

<?php $a=0;foreach($_post['arguments'] $v) $a= $v;echo $a;?>

thanks in advance please..

$_post associative array of variables passed current script.

so need use print_r instead of echo .

window.alert("variable" + <?php  print_r($_post); ?> );

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