__attribute __（（constructor））的工作原理如何？(How exactly does __attribute__((constructor)) work?)

 不同的变量名！ 
 
$ReviewID = $_POST['reviewiduser']; //without final s
foreach($ReviewIDs as $ReviewID) {  //with final s.
/*               ^    */
 
 编辑：你说你还有问题。 可能你的$ _POST是一个字符串。 尝试： 
 
$reviewIDs = json_decode($_POST['reviewiduser']);
 
 这可能会使$ reviewID成为与foreach一起工作的正确数组。 

I was posting from Java to Php as a string and treating it in php like it was an array.
 
In Java I was posting selectOwnUserReviews which was of the format like "[1,34,78]". It looked like an array but was all treated as one unit. And even if I tried operations in php I was doing it on [1 and 34 and 78], not on 1 and 34 and 78. 
 
So in Java I did:
 
//convert [56,23,87] to a string
selectOwnUserReviews = Arrays.toString(category.getUserReviewIds());
//remove [ and ] so we have a string of 56,23,87
selectOwnUserReviews = selectOwnUserReviews.substring(1,selectOwnUserReviews.length()-1);
 
Now I have the string 56,23,87 and I post this string to my php. In my php I use explode to get the individual values, my complete code looking like:
 
<?php
    require('file.php');

    $ReviewID = $_POST['reviewiduser'];

    $ReviewID = explode(",",$ReviewID);

    $results = array();

    foreach($ReviewID as $ReviewID) {
        $sql2 = "SELECT * FROM review WHERE review_id = ?";
        $stmt2 = $con->prepare($sql2) or die(mysqli_error($con));
        $stmt2->bind_param('i', $ReviewID) or die ("MySQLi-stmt binding failed ".$stmt2->error);
        $stmt2->execute() or die ("MySQLi-stmt execute failed ".$stmt2->error);
        $result2 = $stmt2->get_result();

        while($row = mysqli_fetch_array($result2)) {//make an array called $results
            $results[] = array(
                'category' => $row['cat_name'],
                'name' => $row['name'],
                'phone' => $row['phone'],
                'comment' => $row['comment'],
                'reviewid' => $row['review_id'],
            );
        }
    }

        echo json_encode($results);

?>
 
Job done.