Question

如果用户使用ID mysite.com/page.php?id=3访问我的页面，我希望PHP检查是否在数组中定义了ID，如果为true，则根据其定义的ID从同一数组中返回页面多个用户信息

我的代码：

$userinfo = [
        ['id' => 3, 'name' => 'username3', 'phone' => '3333'],
        ['id' => 2, 'name' => 'username2', 'phone' => '2222'],
        ['id' => 1, 'name' => 'username1', 'phone' => '1111']
    ];  

if (isset($_GET['id']) && isset($userinfo[$_GET['id']])) {
     $name = $userinfo[$_GET['name']]; // If I access PHP with '?id=3' wanna 'username3'.
     $phone = $userinfo[$_GET['phone']]; // It stores id 3 user phone: '3333'
    }

echo $name; // It returns 'name' from array.
echo $phone; // It returns 'phone' from array.

它只是一个基础，我知道它不起作用，代码的任何帮助？提前谢谢。

Answer 1

$userinfo = [
        ['id' => 3, 'name' => 'username3', 'phone' => '3333'],
        ['id' => 2, 'name' => 'username2', 'phone' => '2222'],
        ['id' => 1, 'name' => 'username1', 'phone' => '1111']
    ];  
if (isset($_GET['id'])){
    foreach($userinfo as $user){
        if($user['id']==$_GET['id']){
            $name = $user['name'];  
            $phone = $user['phone'];
        }
    }
}
echo $name;  
echo $phone;

Answer 2

您可以根据需要过滤数组：

$userinfo = [
    ['id' => 3, 'name' => 'username3', 'phone' => '3333'],
    ['id' => 2, 'name' => 'username2', 'phone' => '2222'],
    ['id' => 1, 'name' => 'username1', 'phone' => '1111']
];  

$user = null;
if (isset($_GET["id"])) {
    $found = array_filter($userinfo, function ($user) {
           return isset($user["id"]) && $user["id"] == $_GET["id"];
    }); // This will find all users with that id, in case there's more.
    $user = !empty($found)?current($found):null; //current() at this point gets the first entry in $found
}
if ($user != null) {
   echo $user["name"];
   echo $user["phone"];
}

查看array_filter了解更多详情。

Answer 3

您可以将此函数用于关联数组的任何深度。对这个函数的约束只是键值不会重复在数组中的任何位置。

<?php 
function assoc_in_array($array, $key, $key_value){
      $within_array = false;
      foreach( $array as $k=>$v ){
          if( is_array($v) ){
              $within_array = assoc_in_array($v, $key, $key_value);
              if( $within_array == true ){
                    break;
              }
          } else {
                if( $v == $key_value && $k == $key ){
                    $within_array = true;
                    break;
                }
          }
      }
      return $within_array;
}
$test = [
            ['id' => 3, 'name' => 'username3', 'phone' => '3333'],
            ['id' => 2, 'name' => 'username2', 'phone' => '2222'],
        ];
var_dump(assoc_in_array($test, 'id', '3'));
?>

如果是数组内的isset ID，从同一个数组中的定义ID获取值？

3 个答案: