Error

<?php
$fname ="";//First Name
	$lname =""; //Last Name
	$em ="";//Email
	$em2 ="";//Email 2
	$password ="";//password
	$password2 ="";//password2
	$date ="";//signed Up data
	$erro_array= array();

if (isset($_POST["register_button"])){

	//registration form Values

	$fname= strip_tags($_POST["reg_fname"]);//remove HTML Tags
	$fname = str_replace(' ', '', $fname); //remove Spaces
	$fname = ucfirst(strtolower ($fname)); //upper case to first
	$_SESSION ['reg_fname'] =$fname; // stores values of first name in session variable

	// last name

	$lname= strip_tags($_POST["reg_lname"]);//remove HTML Tags
	$lname = str_replace(' ', '', $lname); //remove Spaces
	$lname = ucfirst(strtolower ($lname)); //upper case to first
	$_SESSION ['reg_lname'] =$lname; // stores values of last name in session variable

	//email

	$em = strip_tags($_POST ["reg_email"]);
	$em = str_replace(' ', '',$em);
	$em = ucfirst(strtolower  ($em));
	$_SESSION ['reg_email'] =$em; // stores values of mail id in session variable

	$em2 = strip_tags($_POST ["reg_email2"]);
	$em2 = str_replace(' ', '',$em2);
	$em2 = ucfirst(strtolower ($em2));
	$_SESSION ['reg_email2'] =$em2; // stores values of mail id2 in session variable

	// password


	$password = strip_tags($_POST ["reg_password"]);
	$password2 = strip_tags($_POST ["reg_password2"]);

	$date = date("Y-m-d");// this gets the current date
	}

	//check if the emails match
	if ($em==$em2) {
		//check if emails are in valid format
		if (filter_var($em, FILTER_VALIDATE_EMAIL)) {
			$em = filter_var($em, FILTER_VALIDATE_EMAIL);

			//check if email already exists
			$e_check = mysqli_query ($con , "SELECT email FROM users WHERE email='$em'" );

			// count numbers of rows returned
			$num_rows = mysqli_num_rows($e_check);
			if ($num_rows>0) {

			array_push($erro_array,"Email Already in Use <br>");

					}

		}

			else {

				array_push($erro_array,  "invalid format <br>") ;
		}

	}
	else {
		array_push($erro_array,  "Your Emails Dont match!<br>" );
	}

	if (strlen($fname)>25|| strlen($fname)<2) {
		array_push($erro_array, "your first name must be between 2 and 25 charectors <br>" ) ;

	}
	if (strlen($lname)>25|| strlen($lname)<2) {
		array_push($erro_array," your last name must be between 2 and 25 charectors <br>") ;
	}

	if ($password !== $password2) {
		array_push($erro_array, "password dont match <br>");

	}

	else {
		if (preg_match('/[^A-Za-z0-9]/', $password)) {
		array_push($erro_array, "your last password can only contain english charector or Number <br>");
	}}


//if(strlen($password > 30 || strlen($password) < 5)) {
		//array_push($error_array, "Your password must be betwen 5 and 30 characters<br>");


	if (strlen($password>30||strlen($password)<5)) {
		array_push($erro_array, "your password must be between 5 and 30 charector <br>");
	}

	if (empty($erro_array)) {
		$password = md5($password); //encrypt password before sending to Database

		//generate username by concatnating by firstname and lastname

		$username = strtolower($fname."_". $lname);
		$check_username_query = mysqli_query ($con, "SELECT username FROM user WHERE username = '$username'");
		$i= 0;
		// if user name exists add number to usrname

		while (mysqli_num_rows($check_username_query)!=0) {
			$i++; // add 1 to i

			$username = $username . "_"	. $i;
			$check_username_query = mysqli_query($con, "SELECT username FROM user WHERE username = '$username'");

		}

		// profile pic assignement

		$rand = rand(1,2);

		if ($rand == 1)
		$profile_pic= "assets/images/profile_pics/defaults/head_alizarin.png";
		else if ($rand==2)
			$profile_pic = "assets/images/profile_pics/defaults/head_deep_blu.png";
		$query = mysqli_query($con, "INSERT INTO users VALUES ('','$fname','$lname','$em','$em2','$password','$date','$profile_pic' ,'0','0', 'no', ',' )");

		array_push($erro_array,"<span style='color:#14c800'> you are all set , go ahead and login </span> <br>");

		//clear session variable

		$_SESSION['reg_fname'] = '';
		$_SESSION['reg_lname'] = '';
		$_SESSION['reg_email'] = '';
		$_SESSION['reg_email2'] = '';



	}
?>