mysql - Cannot fetch array inside a function PHP -


i can't fetch array inside function can outside of function. when fetched outside function , echo out, prints out 1, inside function, using same fetch array codes , echoing out, echos null. can tell because --- symbols echos out, number 1 doesn't. i'm confused, because if worked outside function, same code should work inside function, right? unless i'm doing wrong? please help. thanks. 

<?php  include('connect.php'); include('username.php'); //include('functionget.php');  $boo = $_get['boo']; echo "$boo";  function getdata($select,$from,$where,$equals){  $fetch = mysql_fetch_array(mysql_query("select acceptedchallenges       userlogin username = '$username'")); $fetch = $fetch['acceptedchallenges'];  echo "---$fetch---";  }  if($boo = 'yes'){  $acceptedchallenges =     getdata("acceptedchallenges","userlogin","username",$username);  $fetch = mysql_fetch_array(mysql_query("select acceptedchallenges     userlogin username = '$username'")); $fetch = $fetch['acceptedchallenges'];  echo "$acceptedchallenges$username$fetch";  //mysql_query("update userlogin set openchallenges = '0' username =    '$username'"); //mysql_query("update userlogin set acceptedchallenges =    '$acceptedchallenges' username = '$username'");  } else{    } ?>

you passing $where instead of $username change

 function getdata($select,$from,$where,$equals){

to

 function getdata($select,$from,$username,$equals){

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