此处的问题是您使用bindParam绑定了参数，而bindParam则通过引用进行绑定.在您的情况下，应改用bindValue

The problem here is that you binding parameters with bindParam, which uses binding by reference. In your case you should use bindValue instead:

foreach( $binders as $key => $value ) {
    $sql->bindValue( $key, $value );
}

或者您可以将数组直接传递给execute()方法:

Or you can pass your array directly to execute() method:

$sql->execute( $binders );

如手册所述:

the variable is bound as a reference and will only be evaluated at the time that PDOStatement::execute() is called.

因此，当您的foreach循环结束时，$value具有最后一个数组项Apple的值.因此，当execute运行时，:ctid和:p1的值都将等于Apple.当然，这不是您想要的东西

So when your foreach loop ends $value has value of last array item Apple. So when execute runs, both :ctid and :p1 values are becoming equal to Apple. Surely, this is not what you want)