What does this mean?

Posted by LeonixSolutions on Stack Overflow See other posts from Stack Overflow or by LeonixSolutions
Published on 2011-01-08T06:39:28Z Indexed on 2011/01/08 6:53 UTC
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I found this in some code examples while googling :

$sql = 'INSERT INTO users (username,passwordHash) VALUES (?,?)';

it's new to me, but I would guess that it a substitution method and equivalent to

$sql = "INSERT INTO users (username,passwordHash) VALUES ($username,$passwordHash)";` 

or

$sql = 'INSERT INTO users (username,passwordHash) VALUES (' . $username . ',' . $passwordHash . ')';`

would that be correct? Is it an actual PHP syntax, or was he just trying to simplify his example?

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