PHP - function not returning value inside isset -


i have function call find_student_by_id() 1 arg complete code below.

function find_student_by_id($student_number){   global $con;   $safe_student_number = prep($student_number);    $sql  = "select * ";   $sql .= "from studeprofile ";   $sql .= "where studentnumber = '{$safe_student_number}'";   $sql .= "limit 1";   $student_set = mysqli_query($con, $sql);   confirm_query($student_set);   if($student = mysqli_fetch_assoc($student_set)){     return $student;   } else {     return null;   } }

this function work fine if call anywhere in page, if use inside isset function not returning value.

$student = find_student_by_id('id-201');

if use outside isset give me value echo $student['student_number'];

but if used inside isset no value return. 

if(isset($_post['submit'])){   $student_number = $student['student_number']; }

complete code inside cor.php

<?php   $student = find_student_by_id($_get['student_number']);   //if(!$student){   //  redirect_to('home.php');   //}   //$_session['sn'] = $student['studentnumber']; ?> <?php   if(isset($_get['subject_id'])){     $subject = find_subject_id($_get['subject_id']);   }   //if(!$subject){   //  redirect_to('cor.php');   //}  ?> <?php   if(isset($_post['submit'])){    $subject_code = $subject['subjectcode'];   $description = $subject['description'];   $lec_unit = "";   $lab_unit = "";   $section = "";   $labtime = "";   $sched_time = "";   $room = "";   $instructor = "";   $sem = "";   $sy = "";   $sn = $student['studentnumber'];   $term = "";   $fn = $student['firstname'];   $mn = $student['middlename'];   $ln = $student['lastname'];   $course = $student['course'];   $yl = $student['yearlevel'];    $sql  = "insert registration(";   $sql .= "subjectcode, description, lecunit, labunit, ";   $sql .= "section, labtime, schedtime, room, instructor, ";   $sql .= "sem, sy, studentnumber, term, firstname, middlename, ";   $sql .= "lastname, course, yearlevel";   $sql .= ")values(";   $sql .= "'{$subject_code}', '{$description}', '{$lec_unit}', '{$lab_unit}', '{$section}', '{$labtime}', ";   $sql .= "'{$sched_time}', '{$room}', '{$instructor}', '{$sem}', '{$sy}', '{$sn}', ";   $sql .= "'{$term}', '{$fn}', '{$mn}', '{$ln}', '{$course}', '{$yl}'";   $sql .= ")";   $cor = mysqli_query($con, $sql);   if($cor){     redirect_to('cor.php?student_number='.$subject_code);   } else {     die(mysqli_error($con));   }    } ?>   <div>   student number : <?php echo $student['studentnumber']; ?><br />   name: <?php echo fullname($student); ?>    <a class="popup" href="search-subject-cor.php">add subject</a>    <br /> <br />   <p><?php echo $subject['subjectcode']; ?></p>   <p><?php echo $subject['description']; ?></p>    <form method="post" action="cor.php">     <input type="submit" name="submit" value="add subject" />   </form> 

if(isset($_get['subject_id'])){          ^     $subject = find_subject_id($_get['subject_id']); }

compare with

<form method="post" action="cor.php">               ^

and delete question :)


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