PHP 过滤数组的方法 array_filter 和 FilterIterator 迭代器

1 使用array_filter 数组函数

比如我们将数组里，name为abdul的用户删除

$array = array(
    array(
        'name' => 'Jonathan',
        'id'   => '5'
    ),
    array(
        'name' => 'Abdul',
        'id'   => '22'
    )
);

function fn_filter($var)
{
    if(strcasecmp($var['name'], 'abdul') == 0){
        return false;
    }
    return true;
}

print_r(array_filter($array, "fn_filter"));

 

 

2 使用迭代器过滤 FilterIterator

实现与刚才相同的功能

$array = array(
    array(
        'name' => 'Jonathan',
        'id'   => '5'
    ),
    array(
        'name' => 'Abdul',
        'id'   => '22'
    )
);

class UserFilter extends FilterIterator
{
    private $userFilter;//要过滤掉的文字
    //$iterator  迭代器
    //$filter  过滤
    public function __construct(Iterator $iterator, $filter)
    {
        parent::__construct($iterator);
        $this->userFilter = $filter;
    }
    
    public function accept()
    {
        $user = $this->getInnerIterator()->current();
        if (strcasecmp($user['name'], $this->userFilter) == 0) {
            return false;
        }
        return true;
    }
}
 

$object = new ArrayObject($array);
//去除掉名为abdul的人员
$iterator = new UserFilter($object->getIterator(), 'abdul');

foreach ($iterator as $result) {
    echo $result['name'];
}

 

3 FilterIterator 类

 

• FilterIterator::accept — Check whether the current element of the iterator is acceptable 检查迭代器当前元素是否可接受
• FilterIterator::__construct — Construct a filterIterator 构造方法
• FilterIterator::current — Get the current element value 获取当前指针的值
• FilterIterator::key — Get the current key 获取当前指针的key
• FilterIterator::next — Move the iterator forward 将迭代器向前移动
• FilterIterator::rewind — Rewind the iterator  重启迭代器
• FilterIterator::valid — Check whether the current element is valid 检查当前元素是否有效