PHP - Export CSV Function Goes to Blank Page - php

Question

We are creating a function that exports data from a table to a CSV. However, the code seems to redirect to a blank page. I'm not certain what's going on as I have checked the database and table connections. I could be missing something simple, but staring at the code over and over is making it hard to figure out what's wrong.
<?php
require_once('connection.php');
session_start();
if (!$_SESSION['user']) {
header("Location: index.php"); // If session is not set that redirect to Login Page
}
//set successful imported rows count to 0
$successCount = 0;
if(isset($_POST['submit'])){
$skip = mysqli_real_escape_string($csvDatabase, $_POST['header']);
$colNumber = mysqli_real_escape_string($csvDatabase, $_POST['SUIDnumber']);
$colNumber = $colNumber - 1;
$filename = $_FILES["file"]["tmp_name"];
if($_FILES["file"]["size"] > 0) {
for($i=0; $i<count($filename); $i++) {
$file = $filename[$i];
//open file in read only
$files = fopen($file, "r");
//skips first line
fgets($files);
//get data from csv & uses comma to find separate values
while (($getData = fgetcsv($files, 0, ",")) !== FALSE)
{
$fail = FALSE;
//store SUID from 2nd line in csv
$suid = $getData[$colNumber];
if (strlen($suid) === 9 && ctype_digit($suid) ) {
// start ldap look up
$basedn="***";
//Connect to server
$ds=ldap_connect("***");
if ($ds) {
//bind with our special account that retrieves more attributes
$ldaprdn = '***'; // ldap rdn or dn
$ldappass = '***'; // associated password
$r=ldap_bind($ds,$ldaprdn,$ldappass); // this is an authenticated bind
if (substr($suid, 0, 1) === ";" || is_numeric($suid)) {
if ($r) {
//filter to all objectclasses that the SUID we are looking for
$filter = "(&(objectClass=*)(syrEduSUID={$suid}))";
//We are only interested in retrieving these attributes
$justthese = array("displayName", "syrEduLevel", "syrEduProgramDesc", "syrEduProgram", "mail", "eduPersonPrimaryAffiliation", "eduPersonAffiliation" , "uid");
// Search SUID
$sr=ldap_search($ds, $basedn, $filter, $justthese );
//Need to test if the search succeeded. FALSE value means it failed
//if ($sr!==FALSE) {
//Search found something. Now return Attributes and their values - note, there can be multiple values per attribute. We need to make sure the search only returned one result
$entry = ldap_get_entries($ds, $sr);
// if we have only one result, return the values, if not, we have a problem
if ($entry["count"] == 1) {
// get student name and email from suid
$studentName = mysqli_real_escape_string($csvDatabase, $entry[0]['displayname'][0]);
$studentEmail = mysqli_real_escape_string($csvDatabase, $entry[0]['mail'][0]);
$studentAffiliation = mysqli_real_escape_string($csvDatabase, $entry[0]['edupersonprimaryaffiliation'][0]);
$studentProgram = mysqli_real_escape_string($csvDatabase, $entry[0]['syreduprogramdesc'][0]);
$studentEduLevel = mysqli_real_escape_string($csvDatabase, $entry[0]['syredulevel'][0]);
$netID = mysqli_real_escape_string($csvDatabase, $entry[0]['uid'][0]);
$successCount++;
// close ldap
ldap_close($ds);
} else {
$msg = "Ldap search returned 0 or more than one result";
$fail = TRUE;
}
//} else {
// $msg = "Search failed";
// $fail = TRUE;
//}
}
} else {
$msg = "Bind failed";
$fail = TRUE;
}
} else {
$msg = "LDAP connection failed";
$fail = TRUE;
}
//split full name
$studentName = trim($studentName);
$last_name = (strpos($studentName, ' ') === false) ? '' : preg_replace('#.*\s([\w-]*)$#', '$1', $studentName);
$first_name = trim( preg_replace('#'.$last_name.'#', '', $studentName ) );
//inserts data into import table
$sql = "INSERT into import (suid, firstName, lastName, studentEmail, studentAffiliation, studentProgram, studentEduLevel. netID) values ('$suid', '$first_name', '$last_name', '$studentEmail', '$studentAffiliation', '$studentProgram', '$studentEduLevel', '$netID')";
if (!$fail) {
if (mysqli_query($csvDatabase, $sql)) {
//once imported properly, export csv
} else {
echo "Error: " . $sql . "<br>" . mysqli_error($csvDatabase);
}
}
}
}
}
//closes file
fclose($files);
$query = "SELECT suid, firstName, lastName, studentEmail, studentAffiliation, studentProgram, studentEduLevel, netID from import ORDER BY id DESC LIMIT {$successCount}";
$result = mysqli_query($csvDatabase, $query);
if ($result->num_rows > 0) {
header('Content-Type: text/csv; charset=utf-8');
header('Content-Disposition: attachment; filename=data-export.csv');
$output = fopen("php://output", "w");
$headers = array('SUID', 'First Name', 'Last Name', 'Student Email', 'Student Affiliation', 'studentProgram', 'Student Edu Level', 'NetID');
fputcsv($output, $headers);
while($row = mysqli_fetch_assoc($result))
{
fputcsv($output, $row);
}
fclose($output);
//then delete records in database
$deletesql = "DELETE FROM import ORDER BY id DESC LIMIT {$successCount}";
if (mysqli_query($csvDatabase, $deletesql)) {
//echo "Record deleted successfully";
} else {
echo "Error deleting record: " . mysqli_error($csvDatabase);
}
}
} else {
echo "You did not upload a CSV file or the CSV file is blank.";
}
} else {
?>
<!doctype html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8" />
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>CSV Import</title>
<link rel="stylesheet" href="css/foundation.min.css" />
<link rel="stylesheet" href="css/app.css" />
</head>
<body>
<!-- nav -->
<div class="top-bar">
<div class="top-bar-left">
<ul class="menu">
</ul>
</div>
<div class="top-bar-right">
</div>
</div>
<div class="row" style="margin-top: 5%;">
<div class="medium-12 columns">
<h3>Import CSVs for Student Data</h3>
<div class="callout secondary">
<form name="upload_excel" method="post" enctype="multipart/form-data">
<fieldset class="large-4 cell">
<legend>Does the CSV have a header in the first row?</legend>
<input type="radio" name="header" value="yes" id="yesHeader"><label for="yesHeader">Yes</label>
<input type="radio" name="header" value="no" id="noHeader"><label for="noHeader">No</label>
</fieldset>
<label for="SUIDnumber">
What number column is the SUID field in?
<input type="number" value="" id="SUIDnumber" name="SUIDnumber" required>
</label>
<p>Upload your CSV(s) with SUIDs. You will then be prompted to download the exported data.</p>
<input type="file" id="files" name="file[]" accept=".csv" multiple><br>
<input type="submit" class="button" id="submit" name="submit" value="Import CSV">
</form>
</div>
</div>
</div>
<script src="js/vendor/jquery.min.js"></script>
<script src="js/vendor/what-input.min.js"></script>
<script src="js/foundation.min.js"></script>
<script src="js/app.js"></script>
</body>
</html>
<?php } ?>

Answer 1

Was able to find the solution by moving the export CSV function. Thank you all for your help.