How to do an equal statement

How can I use an equals statement that solves this issue:

$username = //drawn from db;

$posted = //posted by user on form;

If $username = $posted then process the form

If $username != $posted then print error.

How 开发者_JS百科can I do this in one step?

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if ($username === $posted) {
   echo "welcome";
} else {
   echo "go away";
}

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In PHP, = is an assignment operator. You probably meant to use two equals symbols together (==) or three equals symbols together (===), which are comparison operators.

Examples:

$user = "asdf"; // set the value of the $user variable to "asdf"

if($user == "asdf") { echo "The user's name is ASDF"; } // compare the value of $user to "asdf"

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There are 2 ways:

1. Extract the information from the database, with the $username and check wether there is an existing row
2. Have variables (as you did) and compare them with == operator or === if they have the same type.

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you can run this

<? $q=mysql_fetch_array(mysql_query("SELECT username FROM yourtable WHERE username='".$_POST['FormUserName']."' and pass="'.$_POST['FormPassword']."' LIMIT 1"));
        if($q['username']==$_POST['FormUserName'])
        {echo "You LOGGED";}
    ?>