dongzichan2886 2018-09-25 23:26
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按条件在多维数组上的PHP array_filter()

I've the below array of users:

$users = [
  [name => 'Alice', age => 22],
  [name => 'Bob', age => 23],
  [name => 'Charlie', age => 19]
];

I'd like to create an array of users that are at least 20 years old. I tried:

$allowed_users = array_filter($users, function($user) {
  return $user->age >= 20;
});
var_dump($allowed_users);

Which returns an empty array. I suppose I'm doing something wrong with the callback function.

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  • douyingbei1458 2018-09-25 23:31
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    You are using object notation with an array. It's a simple fix:

    $users = [
      ['name' => 'Alice', 'age' => 22],
      ['name' => 'Bob', 'age' => 23],
      ['name' => 'Charlie', 'age' => 19]
    ];
    
    $allowed_users = array_filter($users, function($user) {
      return $user['age'] >= 20;
    });
    var_dump($allowed_users);
    

    And although it's not an error in itself, use quotes in your keys, otherwise the interpreter will throw a notice.

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