如何删除PHP中的特定数组 [英] How do I delete a specific array in php

问题描述

我正在构建一个小部件，我创建了一个横幅广告，直到其有效期为止(在wordpress)

I am building a widget I created banner ads to its expiration date (in wordpress)

array(2) {
  [7]=>array(2) {
    ["title"]=>string(3) "ads"
    ["number"]=>int(2)
    [1]=>array(2) {
      ["address-image"]=>string(63) "http://localhost/wordpress/wp-content/uploads/2016/08/120-3.jpg"
      ["expire"]=>string(10) "2017/03/10"
    }
    [2]=>array(2) {
      ["address-image"]=>string(63) "http://localhost/wordpress/wp-content/uploads/2016/08/120-3.jpg"
      ["expire"]=>string(10) "2016/10/20"
    }
  }
  ["_multiwidget"]=>int(1)
}

并希望如下申请:(删除键[2])

And would like to apply as follows: (Delete key [2])

array(2) {
  [7]=>array(2) {
    ["title"]=>string(3) "ads"
    ["number"]=>int(2)
    [1]=>array(2) {
      ["address-image"]=>string(63) "http://localhost/wordpress/wp-content/uploads/2016/08/120-3.jpg"
      ["expire"]=>string(10) "2017/03/10"
    }
  }
  ["_multiwidget"]=>int(1)
}

为此，我在function.php中编写了以下代码:

For this I wrote the following code in the function.php:

function remove_expired_ads(){
    $widgets = get_option('widget_ads_banner_sidebars');
    $count = count($widgets);
    for ($x=1; $x<=$count ;$x++ ){
        foreach ( $widgets as $key => $w){
            if (!is_array( $w )) continue ;
            if(!empty($w[$x]['expire'])) {

                $today_date = date('Ymd');
                $expire_date = $w[$x]['expire'];
                $expire_year = substr($expire_date, 0, 4);
                $expire_month = substr($expire_date, 5, 2);
                $expire_day = substr($expire_date, 8, 2);
                $expire_time = $expire_year . $expire_month . $expire_day;

                if (($today_date >= $expire_time)) {

                    //dd($widgets[$key][$x]);
                    unset($widgets[$key][$x]); 
                    //If this method to write the entire arrays will be deleted  unset($widgets[$key]);
                }
            }
        }
    }

    update_option('widget_ads_banner_sidebars', $widgets , true);
}
add_action('widgets_init','remove_expired_ads');

但是结果如下:

array(2) {
  [7]=>array(2) {
    ["title"]=>string(3) "ads"
    ["number"]=>int(2)
    [1]=>array(2) {
      ["address-image"]=>string(63) "http://localhost/wordpress/wp-content/uploads/2016/08/120-3.jpg"
      ["expire"]=>string(10) "2017/03/10"
    }
    [2]=>array(2) {
      ["address-image"]=>string(0) ""
      ["expire"]=>string(0) ""
    }
  }
  ["_multiwidget"]=>int(1)
}

更新当我打印自己的代码结果时

UPDATE When I print my own code result

array(2) {
  ["address-image"]=>
  string(63) "http://localhost/wordpress/wp-content/uploads/2016/08/120-3.jpg"
  ["expire"]=>
  string(10) "2016/10/20"
}

我如何访问密钥(密钥[2])

How do I access key (key [2])

对不起，我的英语不太好

Sorry, my English is not very good

推荐答案

您可以使用以下循环:

$now = strtotime('now');

foreach ($widgets as $key => $widget) {
    if (!is_array($widget)) {
        continue;
    }

    $noOfAdds = 0;
    $widget = array_filter($widget, function ($ad) use (&$noOfAdds, $now) {
        if (!is_array($ad) || !isset($ad['expire'])) {
            return true;
        }

        if ($now >= strtotime($ad['expire'])) {
            return false;
        }

        $noOfAdds += 1;
        return true;
    });

    if ($noOfAdds) {
        $widgets[$key] = $widget;
        $widgets[$key]['number'] = $noOfAdds;
        continue;
    }

    unset($widgets[$key]);
}

我们使用 foreach 遍历小部件，并 array_filter 过滤掉过期的广告.如果该窗口小部件的所有广告均已过期，则将取消设置该窗口小部件.如果窗口小部件中有有效的广告，则数字将更新.我已经使用 strtotime 来使日期具有可比性.

We use foreach to traverse widgets and array_filter to filter out expired ads. If all ads of the widget are expired the widget is unset. If there valid ads in the widget the number is updated. I have used strtotime to make dates comparable.

这是工作演示.

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