Question

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

将使用遍历我的循环的数组示例：

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>
    )

)

foreach（）循环清除数组中的空对象：

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，不打印任何内容。任何帮助表示赞赏。

Answer 1

根据建议here，您可以使用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"));

工作正常

Answer 2

我可能错了，但你的数组应该包含引号括起来的项目：

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

否则无论发生什么都是不可预测的。

Answer 3

您正在检查数组keys（_title，_issues），而不是values（Abdomem等）。

在foreach循环中没有命令回显的数组项

3 个答案: