Question

我想用php

从json数组中删除一个元素

[{"userid":"20"},{"userid":"17"},{"userid":"18"}]

我想让它像那样

[{"userid":"20"},{"userid":"18"}]

Answer 1

首先解析JSON字符串，然后删除该元素，然后再次对其进行编码：

$array = json_decode('[{"userid":"20"},{"userid":"17"},{"userid":"18"}]');

foreach ($array as $key=>$element) {
    if ($element->userid == "17") {
        unset($array[$key]);
    }
}

$output = json_encode($array);

Answer 2

如果你知道元素索引：

unset($array[1]); // 1 is the index of element.

如果您不知道元素索引：

// Deserialize the JSON into associative array.
$users = json_decode('[{"userid":"20"},{"userid":"17"},{"userid":"18"}]', true);

// For each user and it's index in array of users.
foreach ($users as $index => $user) {
    // If currently iterated user id is equals to 17.
    if ($user["userid"] == 17) {
        // Remove it from an array of users.
        unset($users[$index]);
    }
}

// Echo all elements inside an array of users as JSON.
echo json_encode(array_values($users));

用php删除json对象表单数组

2 个答案: