bindvalue

问题 What is the difference between PDOStatement::bindParam() and PDOStatement::bindValue()? 回答1: The answer is in the documentation for bindParam: Unlike PDOStatement::bindValue(), the variable is bound as a reference and will only be evaluated at the time that PDOStatement::execute() is called. And execute call PDOStatement::bindParam() to bind PHP variables to the parameter markers: bound variables pass their value as input and receive the output value, if any, of their associated parameter

问题 Here is a snapshot of my code: $fetchPictures = $PDO->prepare(\"SELECT * FROM pictures WHERE album = :albumId ORDER BY id ASC LIMIT :skip, :max\"); $fetchPictures->bindValue(\':albumId\', $_GET[\'albumid\'], PDO::PARAM_INT); if(isset($_GET[\'skip\'])) { $fetchPictures->bindValue(\':skip\', trim($_GET[\'skip\']), PDO::PARAM_INT); } else { $fetchPictures->bindValue(\':skip\', 0, PDO::PARAM_INT); } $fetchPictures->bindValue(\':max\', $max, PDO::PARAM_INT); $fetchPictures->execute() or die(print