如果在php上删除了密钥，我怎样才能重新更新数组中的值？

Question

我的代码删除键如下：

<?php
    $photoList = array(
        array(
            'id' => 1,
            'name' => 'chelsea.jpg'
        ),
        array(
            'id' => 2,
            'name' => 'mu.jpg'
        ),
        array(
            'id' => 3,
            'name' => 'city.jpg'
        )
    );
    if(count($photoList) > 1) {
        $id = 1;
        foreach($photoList as $key => $value) {
            if($value['id'] == $id)
                unset($photoList[$key]);   
        }
    }
    echo '<pre>';print_r($photoList);echo '</pre>';
?>

如果执行代码，结果如下：

Array
(
    [1] => Array
        (
            [id] => 2
            [name] => mu.jpg
        )

    [2] => Array
        (
            [id] => 3
            [name] => city.jpg
        )
)

我希望值重新更新。所以id从1开始，键从0开始，如下所示：

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => mu.jpg
        )

    [1] => Array
        (
            [id] => 2
            [name] => city.jpg
        )
)

我该怎么做？请帮帮我，有什么不对？谢谢

Answer 1

您可以保留一个标志$delete并使用它来记住是否已完成删除，然后更改值，如果它是真的。

if(count($photoList) > 1) {
    $id = 1;
    $delete = false;
    foreach($photoList as $key => &$value) { // notice the & to make it by reference (editable)
        if($value['id'] == $id && $delete == false){
            $delete = true;
            unset($photoList[$key]);   
        }Else if($delete == true){
            $value["id"] = $id;
            $id++; // update id for next value in array
        }
    }
}
$photoList= array_values($photoList);

https://3v4l.org/N2qjm

---

没有参考：

if(count($photoList) > 1) {
    $id = 1;
    $delete = false;
    foreach($photoList as $key => $value) {
        if($value['id'] == $id && $delete == false){
            $delete = true;
            unset($photoList[$key]);   
        }Else if($delete == true){
            $photoList[$key]["id"] = $id;
            $id++;
        }
    }
}
$photoList= array_values($photoList);

Answer 2

试试这个..

   <?php
            $photoList = array(
                array(
                    'id' => 1,
                    'name' => 'chelsea.jpg'
                ),
                array(
                    'id' => 2,
                    'name' => 'mu.jpg'
                ),
                array(
                    'id' => 3,
                    'name' => 'city.jpg'
                )
            );
            $newphotolist = [];
            $counter_id = 0;
            if(count($photoList) > 1) {
                $id = 1;
                foreach($photoList as $key => $value) {
                    if($value['id'] != $id){
                        $counter_id++;
                        $arr = array('id' => $counter_id, 'name' => $value['name']);
                        $newphotolist[] = $arr;
                    }
                }
            }
            echo '<pre>';print_r($newphotoList);echo '</pre>';
        ?>

Answer 3

$photoList = array(
        array(
            'id' => 1,
            'name' => 'chelsea.jpg'
        ),
        array(
            'id' => 2,
            'name' => 'mu.jpg'
        ),
        array(
            'id' => 3,
            'name' => 'city.jpg'
        )
    );
    if(count($photoList) > 1) {
        $id = 1;
        foreach($photoList as $key => $value) {
            if($value['id'] == $id)
                unset($photoList[$key]);   
        }
    }

在工作结束时，先重新排序密钥。

$photoList = array_values($photolist);

然后，重新排序你的身份。

foreach($photoList as $key=>$val) {
    $photoList[$key]['id'] = $key+1;
}

Answer 4

<?php
    $photoList = array(
        array(
            'id' => 1,
            'name' => 'chelsea.jpg'
        ),
        array(
            'id' => 2,
            'name' => 'mu.jpg'
        ),
        array(
            'id' => 3,
            'name' => 'city.jpg'
        )
    );
    if(count($photoList) > 1) {
        $id = 1; $intStartId = 1;
        foreach($photoList as $key => &$value) {
            if($value['id'] == $id)
                unset($photoList[$key]);
            else {
                $value['id'] = $intStartId;
                ++ $intStartId;
            }
        }
    }
    $photoList = array_merge(array(), $photoList);
    echo '<pre>';print_r($photoList);echo '</pre>';