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we are getting this error during register.php
Fatal error: Uncaught Error: Call to undefined function mysql_real_escape_string()

What I have tried:

on registration php i m getting this error
Updated 23-Jun-22 20:20pm
Richard Deeming 31-Mar-17 14:51pm
That means there's an error somewhere in your secret code.

But since you've declined to share any of the relevant code with us, we can't tell you where, or how to fix it.

All we can tell you is that you're trying to call a function called mysql_real_escape_string, and that function is not defined.
Bryian Tan 31-Mar-17 16:57pm
Maybe that function is obsolete depending on the PHP version that the application is using. My gut feeling is, the application should use mysqli_real_escape_string(). We don't know until the day you decide to share your secret code ...

PHP: mysql_real_escape_string - Manual[^]

Read the mysql_real_escape_string()[^] documentation:
Warning This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:
Member 13097810 4-Apr-17 10:02am
pls find my code

		<title>BHARAT HILLS</title>
		<h2>Registration Page</h2>
		<a href="index.php">Click here to go back</a><br/><br/>
		<form action="register.php" method="POST">
		Enter Username:  <input type="text" Name ="username" required ="required"/><br/><br/>
		Enter password:  <input type="password" name="password" required="required"/><br/>
		<input type="submit" value="register"/>

		mysql_connect("localhost", "root","") or die(mysql_error());//connect to server
		mysql_select_db("first_db") or die("cannot connect to database");//connect to database
		$query=mysql_query("select * from Users"); //query the user table
		while($row=mysql_fetch_array($query)) //display all rows from query
				$table_users=$row['username']; //the first username row is passed on to $table_users,and so on untill the query is finish
				if($username==$table_user)// checks if there are any matching fields
						$bool=false;//sets bool to false
						print'<script>alert("username has been taken!"):</script>';//redirects to register.php
		if($bool) //checks if bool is true
				mysql_query("insert into user (username,password) values ('$username','$passwors')");//inset the vallue to table users
				print '<script>alert("Successfully Registered!");</script>';//prompts the user
				print '<script>window.location.assign("register.php");</script>';//redirect to register.php
Member 13097810 1-Apr-17 9:17am
sir in my code
mysql_connect("localhost", "root","") or die(mysql_error());//connect to server
localhost is underline red color means not connected kindly help i m just using ur code i m new for php
Richard Deeming 3-Apr-17 13:52pm
If you want to update your question, click the green "Improve question" link at the bottom of your question.

DO NOT post your update as a "solution".

And DO NOT mark your "solution" as the accepted solution to your question!
	$username = "";
	$email = "";
	$errors = array();
		// connect to the database
	$db = mysqli_connect('localhost', 'root', '', 'registration');

	// if register button is clicked

		$username = mysql_real_escape_string($_POST['username']);
		$email = mysql_real_escape_string($_POST['email']);
		$password_1 = mysql_real_escape_string($_POST['password_1']);
		$password_2 = mysql_real_escape_string($_POST['password_2']);

		//ensure that the form field are filled properly

		if (empty($username)) {
			array_push($errors, "Username is required"); 
		if (empty($email)) {
			array_push($errors, "Email is required"); 
		if (empty($password_1)) {
			array_push($errors, "Password is required"); 
		if (empty($password_1 != $password_2)) {
			array_push($errors, "Two password do not match"); 

		// if there are no errors, save user to the database
		if (count($errors) == 0) {
			$password = md5($password_1); //encrypt password before storing in database (security)
			$sql = "INSERT INTO users (username, email, password) 
						VALUES ('$username','$email', '$password')";

Richard Deeming 11-Sep-18 12:15pm
The question has already been solved.

And the md5 function[^] specifically warns that it is not suitable for securing passwords. You should be using password_hash[^] and password_verify[^] instead.

PHP: Password hashing FAQ[^]

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