PHP - mysqli_select_db not working [closed] - php

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I am switching from MySQL to MySQLi and I am upon an error which i Google and was unable to solve. The problem is with the selection (mysqli_select_db) of the database which was okay prior to the transition where i was using (mysql_select_db). Hope your can help me solve this problem.
UPDATE - MY CURRENT CODE
<?php
$submit = $_POST['submit'];
//form data
$name = mysqli_real_escape_string($_POST['name']);
$name2 = mysqli_real_escape_string($_POST['name2']);
$email = mysqli_real_escape_string($_POST['email']);
$password = mysqli_real_escape_string($_POST['password']);
$password2 = mysqli_real_escape_string($_POST['password2']);
$phone2 = mysqli_real_escape_string($_POST['phone2']);
$email2 = mysqli_real_escape_string($_POST['email2']);
$address = mysqli_real_escape_string($_POST['address']);
$address2 = mysqli_real_escape_string($_POST['address2']);
$address3 = mysqli_real_escape_string($_POST['address3']);
$address4 = mysqli_real_escape_string($_POST['address4']);
if ($submit) {
//connect database
$connect = mysqli_connect("localhost", "root", "Passw0rd", "logindb") or die ("Connection Error");
//namecheck
$namecheck = mysqli_query($connect, "SELECT * FROM users WHERE email='{$email}'");
//check for existance
if($name&&$name2&&$email&&$password&&$password2&&$phone2&&$email2&&$address&&$address2&&$address3&&$address4) {
if(strlen($password)<8) {
echo "Password must be least 8 characters";
}
if(!preg_match("#[A-Z]+#",$password)) {
echo "Password must have at least 1 upper case characters";
}
if(!preg_match("#[0-9]+#",$password)) {
echo "Password must have at least 1 number";
}
if(!preg_match("#[\W]+#",$password)) {
echo "Password must have at least 1 symbol";
}
if($_POST['password'] != $_POST['password']) {
echo "Password does not match";
}
if($_POST['email2'] == $_POST['email']) {
echo "Secondary email must not be the same as Email";
}
//encrypt password
$password = sha1($password);
$password2 = sha1($password2);
//generate random code
$random = rand(11111111,99999999);
if(isset($error)&&!empty($error)) {
implode($error);
}
else
{
//register the user
$register = mysqli_query($connect, "INSERT INTO users VALUES ('','$name','$name2','$email','$password','$password2','$phone2','$email2','$address','$address2','$address3','$address4','$random','0')");
$lastid = mysqli_insert_id($connect);
echo "<meta http-equiv='refresh' content='0; url=Activate.php?id=$lastid&code=$random'>";
die ();
}
}
}
?>

Answer 1

pass connection ref in 1st param in mysqli_select_db() function, try this
mysqli_select_db($connect, "logindb") or die("Selection Error");
and also in mysqli_query($connect, "query here")
UPDATE all mysqli_* functions required connection ref except result functions

Answer 2

Quick complete solution
<?php
$submit = $_POST['submit'];
//connect database
$connect = mysqli_connect("localhost", "root", "Passw0rd") or die ("Connection Error");
//select database
mysqli_select_db($connect, "logindb") or die("Selection Error");
//form data
$name = mysqli_real_escape_string($connect, $_POST['name']);
$name2 = mysqli_real_escape_string($connect, $_POST['name2']);
$email = mysqli_real_escape_string($connect, $_POST['email']);
$password = mysqli_real_escape_string($connect, $_POST['password']);
$password2 = mysqli_real_escape_string($connect, $_POST['password2']);
$phone2 = mysqli_real_escape_string($connect, $_POST['phone2']);
$email2 = mysqli_real_escape_string($connect, $_POST['email2']);
$address = mysqli_real_escape_string($connect, $_POST['address']);
$address2 = mysqli_real_escape_string($connect, $_POST['address2']);
$address3 = mysqli_real_escape_string($connect, $_POST['address3']);
$address4 = mysqli_real_escape_string($connect, $_POST['address4']);
if ($submit) {
//namecheck
$namecheck = mysqli_query($connect, "SELECT * FROM users WHERE email='{$email}'");
$count = mysqli_num_rows($namecheck);
if(strlen($email)<5) {
echo "Email must have at least 5 characters";
}
else
{
if($count==0) {
}
else
{
if($count==1) {
echo "User already Exists";
}
}
}
//check for existance
if($name&&$name2&&$email&&$password&&$password2&&$phone2&&$email2&&$address&&$address2&&$address3&&$address4) {
if(strlen($password)<8) {
echo "Password must be least 8 characters";
}
if(!preg_match("#[A-Z]+#",$password)) {
echo "Password must have at least 1 upper case characters";
}
if(!preg_match("#[0-9]+#",$password)) {
echo "Password must have at least 1 number";
}
if(!preg_match("#[\W]+#",$password)) {
echo "Password must have at least 1 symbol";
}
if($_POST['password'] != $_POST['password']) {
echo "Password does not match";
}
if($_POST['email2'] == $_POST['email']) {
echo "Secondary email must not be the same as Email";
}
//encrypt password
$password = sha1($password);
$password2 = sha1($password2);
//generate random code
$random = rand(11111111,99999999);
if(isset($error)&&!empty($error)) {
implode($error);
}
else
{
//register the user
$register = mysqli_query($connect, "INSERT INTO users VALUES ('','$name','$name2','$email','$password','$password2','$phone2','$email2','$address','$address2','$address3','$address4','$random','0')");
$lastid = mysqli_insert_id($connect);
echo "<meta http-equiv='refresh' content='0; url=Activate.php?id=$lastid&code=$random'>";
die ();
}
}
}
?>
You also have to write fields after table name on line 70 $register = mysqli_query($connect, "INSERT INTO users and before values VALUES ( like example below.
INSERT INTO users(username,userpass,name,email,userrole,joined,userstatus) VALUES('$username','$userpass','$name','$email','$userrole','$joined','$userstatus')
Replace you line #70 with the following one
$register = mysqli_query($connect, "INSERT INTO users(name,name2,email,password,password2,phone2,email2,address,address2,address3,address4,random,active) VALUES ('$name','$name2','$email','$password','$password2','$phone2','$email2','$address','$address2','$address3','$address4','$random','0')");