Mysql_fetch_array() expects parameter 1 to be resource, boolean given in

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if(isset($_POST['submit']))
{
session_start();
$username = mysql_real_escape_string($_POST['username']);
$password = mysql_real_escape_string($_POST['password']);
$query = mysql_query("SELECT * FROM user where username=$username and
password=$password");
$row = mysql_fetch_array($query);
if($row['username']==$username && $row['password']==$password)
{
echo "wellcomo";
}else{
echo "enter correct details";
}
}

What I have tried:

can any one sugget me solution for this

Posted 21-Jul-18 5:36am

Member 13920909

Updated 21-Jul-18 7:06am

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Richard Deeming 23-Jul-18 13:28pm

NEVER store passwords in plain text!
Secure Password Authentication Explained Simply[^]
Salted Password Hashing - Doing it Right[^]

PHP even has built-in functions to help you do the right thing:
PHP: password_hash[^]
PHP: password_verify[^]

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Richard MacCutchan · Answer 1 · 2018-07-21T07:06:00

Yet another question on this often asked subject.

If you tried a Google search you would find the answer quite quickly. You could find it even quicker by reading the documentation, where it explains the different result types that a MySQL command may return. Hint: do not assume that your command will always succeed.

Patrice T · Answer 2 · 2018-07-21T06:23:00

PHP

$query = mysql_query("SELECT * FROM user where username=$username and
password=$password");

Not a solution to your question, but another problem you have.
Never build an SQL query by concatenating strings. Sooner or later, you will do it with user inputs, and this opens door to a vulnerability named "SQL injection", it is dangerous for your database and error prone.
A single quote in a name and your program crash. If a user input a name like "Brian O'Conner" can crash your app, it is an SQL injection vulnerability, and the crash is the least of the problems, a malicious user input and it is promoted to SQL commands with all credentials.
SQL injection - Wikipedia[^]
SQL Injection[^]
SQL Injection Attacks by Example[^]
PHP: SQL Injection - Manual[^]
SQL Injection Prevention Cheat Sheet - OWASP[^]
How can I explain SQL injection without technical jargon? - Information Security Stack Exchange[^]

Mysql_fetch_array() expects parameter 1 to be resource, boolean given in

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