-1

我正在使用一个多维数组，其中将包含可变数量的空对象。我编写了一个脚本来简单地 unset() 空的，它工作正常。但是，即使没有 echo() 函数，当我的循环运行时，也会打印非空值，我似乎无法弄清楚原因。

将在我的循环中使用的数组示例：

Array
(
[0] => Group Object
    (
        [_title] => <strong>Abdomen</strong><ul>
        [_issues] => <li><strong>Ascites</strong>: 1</li><li><strong>Blood Clot</strong>: 2</li>
    )

[1] => Group Object
    (
        [_title] => <strong>Air Sac</strong><ul>
        [_issues] => <li><strong>Cloudy</strong>: 1</li>
    )

[2] => Group Object
    (
        [_title] => <strong>Beak Treatment</strong><ul>
        [_issues] => <li><strong>Severe</strong>: 3</li>
    )

[3] => Group Object
    (
        [_title] => 
        [_issues] => 
    )

[4] => Group Object
    (
        [_title] => 
        [_issues] => 
    )

[5] => Group Object
    (
        [_title] => <strong>Crop</strong><ul>
        [_issues] => <li><strong>Impacted</strong>: 2</li>
    )

[6] => Group Object
    (
        [_title] => <strong>Feathering</strong><ul>
        [_issues] => <li><strong>Soiled</strong>: 1</li>
    )

[7] => Group Object
    (
        [_title] => <strong>Feet</strong><ul>
        [_issues] => <li><strong>Swollen</strong>: 1</li>
    )

[8] => Group Object
    (
        [_title] => 
        [_issues] => 
    )

[9] => Group Object
    (
        [_title] => 
        [_issues] => 
    )

[10] => Group Object
    (
        [_title] => <strong>Heart</strong><ul>
        [_issues] => <li><strong>Compromised</strong>: 1</li>
    )

[11] => Group Object
    (
        [_title] => <strong>Hock</strong><ul>
        [_issues] => <li><strong>Clear Exudate</strong>: 2</li>
    )

[12] => Group Object
    (
        [_title] => 
        [_issues] => 
    )

[13] => Group Object
    (
        [_title] => 
        [_issues] => 
    )

[14] => Group Object
    (
        [_title] => 
        [_issues] => 
    )

[15] => Group Object
    (
        [_title] => <strong>Kidney</strong><ul>
        [_issues] => <li><strong>Injured</strong>: 2</li>
    )

)

清除数组内空对象的 foreach() 循环：

foreach ($issues as $key => $link) {
            if ($issues[$key] != '') {
        unset($issues[$key]);   
    }
  }

最后，循环运行时打印的输出：

<strong>Abdomen</strong><ul>
    <li><strong>Ascites</strong>: 1</li>
    <li><strong>Blood Clot</strong>: 2</li>
<strong>Air Sac</strong><ul>
    <li><strong>Cloudy</strong>: 1</li>
<strong>Beak Treatment</strong><ul>
    <li><strong>Severe</strong>: 3</li>
<strong>Crop</strong><ul>
    <li><strong>Impacted</strong>: 2</li>
<strong>Feathering</strong><ul>
    <li><strong>Soiled</strong>: 1</li>
<strong>Feet</strong><ul>
    <li><strong>Swollen</strong>: 1</li>
<strong>Heart</strong><ul>
    <li><strong>Compromised</strong>: 1</li>
<strong>Hock</strong><ul>
    <li><strong>Clear Exudate</strong>: 2</li>
<strong>Kidney</strong><ul>
    <li><strong>Injured</strong>: 2</li>

显然，我只想删除空组并且不打印任何内容。任何帮助表示赞赏。

4

3 回答 3

1

As was suggested here, you can use array_filter

class Foo {

    public $bar;

    public function __construct($arg)
    {
        $this->bar = $arg;
    }

    public function isEmpty()
    {
        if (is_string($this->bar) && !empty($this->bar))
        {
            return false;
        }

        return true;
    }

}

$array = array(
    new Foo(29),
    new Foo(''),
    new Foo('hello'),
    new Foo(null),
    new Foo('world'),
);

function obj_is_empty($obj)
{
    return ( ! $obj->isEmpty() );
}

print "<pre>";
var_dump(array_filter($array, "obj_is_empty"));

Works fine

于 2013-03-30T23:21:29.560 回答
0

我可能错了，但你的数组应该有用引号括起来的项目：

    [_title] => "<strong>Abdomen</strong><ul>"

否则无论未来如何都是不可预测的。

于 2013-03-30T23:09:58.040 回答
0

You are checking against array keys (_title, _issues), not values (Abdomem, etc).

于 2013-03-30T23:12:23.817 回答