在foreach循环中没有命令回显数组项

Question

我正在处理一个多维数组，其中包含可变数量的空对象。我已经编写了一个脚本来简单地unset()空的，它工作得很好。然而，即使没有echo()函数，当我的循环运行时，也会打印非空值，我似乎不明白为什么。

使用run through my loop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()循环清除数组内的空对象:

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。

Answer 1

正如这里所建议的，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"));

没问题

Answer 2

我可能错了，但是你的数组应该有引号包围的项目:

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

Answer 3

您正在检查数组keys (_title， _issues)，而不是values(腹腔等)