PHP SELECT statement not working - php

Question

I am making a login form for my website. When I click submit on my login form it doesn't seem to run the SELECT statement as it is in my code.
$result = $mysqli_conn->query("SELECT * FROM user WHERE email = '$emailclean' AND password = '$passwordclean'");
if($row = mysqli_fetch_assoc($result)){
$finalmessager['success'] = 'You are logged in';
$_SESSION['finalmessager']= $finalmessager;
}else{
$finalmessager['fail'] = 'You are not logged in';
$_SESSION['finalmessager']= $finalmessager;
}
It seems to identify $emailclean but it doesn't seem to read $passwordclean. However, when I try to manually put the password such as
$result = $mysqli_conn->query("SELECT * FROM user WHERE email = '$emailclean' AND password = 'celenelqdekdnnd.......'");
it seems to work fine.
What am I doing wrong here?
This is my Code:
require "../config/init.php";
require "../config/config.php";
if(isset($_POST['submit'])){
$passwordclean = mysqli_real_escape_string($mysqli_conn, hash("sha512", $_POST['password']));
$emailclean= mysqli_real_escape_string($mysqli_conn, $_POST['email']);
$errorCheckr = array(); //an array is introduced to check errors
$finalmessager = array();//an array to display final message
if (empty($emailclean)) {
$errorCheckr['emailcheck'] = 'Please enter your email';
}else{
$_SESSION['email'] = $emailclean;
}
if (empty($passwordclean)) {
$errorCheckr['passwordcheck'] = 'Please enter your password';
}else{
$_SESSION['password'] = $passwordclean;
}
//Sanitize
if (!empty($emailclean) && !filter_var($emailclean, FILTER_VALIDATE_EMAIL)) {
$errorCheckr['emailvalidcheck'] = 'Your email is not valid';
}
if (strlen($email) > 50) {
$errorCheckr['emaillengthcheck'] = 'Your email is too long';
}
if (!empty($passwordclean) && strlen($passwordclean) < 5) {
$errorCheckr['passwordlengthcheck'] = 'Your password is too short';
}
if (empty($errorCheckr)) {
$result = $mysqli_conn->query("SELECT * FROM user WHERE email = '$emailclean' AND password = '$passwordclean'");
if($row = mysqli_fetch_assoc($result)){
$finalmessager['success'] = 'You are logged in';
$_SESSION['finalmessager']= $finalmessager;
}else{
$finalmessager['fail'] = 'You are not logged in';
$_SESSION['finalmessager']= $finalmessager;
}
unset($_SESSION['email']);
unset($_SESSION['password']);
header('location:../loginform.php');
}else{
$_SESSION['regErrors']= $errorCheckr;
header('location:../loginform.php');
}
}

Answer 1

First turn on errors:
<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');
Test if post variable and password is set:
<?php
var_dump($_POST['password']);
var_dump($passwordclean);
Few tips:
1) Why save the password in a session?
2) You're checking the length of $passwordclean which will always be 128 chars since it is being hashed with sha512.
3) :
<?php
$result = $mysqli_conn->query("SELECT * FROM user WHERE email = '". mysqli_real_escape_string($mysqli_conn, $_POST['email']) ."' AND password = '". mysqli_real_escape_string($mysqli_conn, hash("sha512", $_POST['password'])) ."'");