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mysql_num_rows() expects parameter 1 to be resource, boolean given in line 33
if($password!=$password_again){
echo'password did not match';
}else{
$query="SELECT username FROM users WHERE 'username'='$username'";
$query_run=mysql_query($query);
if(mysql_num_rows($query_run)==1){
echo'the username'.$username.'already exists';
}else{
echo'ok';
}
}
'username'='$username'Change this tousername='$username'