将字符串和变量传递给php函数

Question

我有一个脚本来管理我的表并包含获取列表或通过 id 获取某些数据的功能。 现在我的一个函数看起来像这样

//Returns a Series Object matching the given series id
public static function getById( $WHERE, $id ){
    $conn = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD );
    $sql = "SELECT * FROM series $WHERE $id";
    $st = $conn->prepare( $sql );
    $st->execute();
    $row = $st->fetch();
    $conn = null;
    if( $row ) return new Series( $row );
}

但我希望它是这样的

//Returns a Series Object matching the given series id
public static function getById( $statement ){
    $conn = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD );
    $sql = "SELECT * FROM series $statement";
    $st = $conn->prepare( $sql );
    $st->execute();
    $row = $st->fetch();
    $conn = null;
    if( $row ) return new Series( $row );
}

所以不必这样做

$series = Series::getById( ( string ) "WHERE id=", (int) $_POST['seriesId'] ); 

我能做到

$series = Series::getById( ( string ) "WHERE id=$_POST['seriesId']" ); 

Answer 1

将该值传递给您的函数的正确方法如下：

$series = Series::getById("WHERE id=".$_POST['seriesId']);