数组中的 PHP 对象（如何：如果数组键为 0，则返回 0。否则，如果数组键为 2，则返回 2。基本逻辑）

【问题标题】：PHP objects inside arrays (HOW TO: If array key is 0, return 0. Else if array key is 2, return 2. BASIC LOGIC)数组中的 PHP 对象（如何：如果数组键为 0，则返回 0。否则，如果数组键为 2，则返回 2。基本逻辑）
【发布时间】：2013-06-07 06:34:30
【问题描述】：

我想要做什么：
以这种方式获取以逗号分隔的单个字符串上的名称列表（如果有多个）：

  • Britney Spears,Lady Gaga,Miley Cyrus

发生了什么：

  • 我们在一个循环中。
  • 我正在尝试将这些 celebrities 关联到帖子 ID

所以我们为每个循环都有这个独特的$id。
一个ID可以附加多个名人name。

查询：

$array = $wpdb->get_results("SELECT name
FROM celebrities
WHERE id = " . $id . "");

PHP 代码： 

if (is_array($array) && $array != null) {
    foreach($array as $single) {
        $array = $single->name . ',';
    }
}
else {
    $array = $array->name;
}

问题：

使用我的代码，我被限制为每个循环只有一个名人（即使数据库显示还应该有另一个名人）。

我真的只想检查是否存在多个名人name，然后将它们放在一个用逗号分隔的单个字符串中。

期望的输出：

下面是我想要完成的简单概述：

  • array(0) （没有名人） = // SHOW NOTHING
  • array(1) （找到一个名人名字） = echo $name
  • array(2) （不止一位名人） = foreach($names as $name)

Var_dump：

我只想向您展示数组结构的复杂性：

array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1620 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(2) {
    [0] = >
        object(stdClass) #1683 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
[1] = >
    object(stdClass) #1611 (1) {
    ["name"]= >
    string(10)
"Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1614 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1690 (1) {
    ["name"]= >
        string(6)
    "Miley Cyrus"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1598 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(0) {}
array(4) {
    [0] = >
        object(stdClass) #1722 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
[1] = >
    object(stdClass) #1706 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
[2] = >
    object(stdClass) #1668 (1) {
    ["name"]= >
    string(10)
"Lady Gaga"
}
[3] = >
    object(stdClass) #1663 (1) {
    ["name"]= >
    string(10)
"Lady Gaga"
}
}
array(4) {
    [0] = >
        object(stdClass) #1615 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
[1] = >
    object(stdClass) #1708 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
[2] = >
    object(stdClass) #1723 (1) {
    ["name"]= >
    string(10)
"Lady Gaga"
}
[3] = >
    object(stdClass) #1726 (1) {
    ["name"]= >
    string(10)
"Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1598 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1663 (1) {
    ["name"]= >
        string(6)
    "Miley Cyrus"
}
}
array(1) {
    [0] = >
        object(stdClass) #1722 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1734 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1598 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1750 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1751 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1716 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1776 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1795 (1) {
    ["name"]= >
        string(6)
    "Miley Cyrus"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1647 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1784 (1) {
    ["name"]= >
        string(6)
    "Miley Cyrus"
}
}
array(1) {
    [0] = >
        object(stdClass) #1776 (1) {
    ["name"]= >
        string(6)
    "Miley Cyrus"
}
}
array(1) {
    [0] = >
        object(stdClass) #1611 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1676 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1781 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(0) {}
array(0) {}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1715 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1813 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1826 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1828 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1717 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1765 (1) {
    ["name"]= >
        string(6)
    "Miley Cyrus"
}
}
array(1) {
    [0] = >
        object(stdClass) #1769 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1848 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1690 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1660 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1821 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1717 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1766 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1836 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(0) {}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1765 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1826 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(0) {}
array(0) {}
array(0) {}
array(0) {}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1843 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(0) {}
array(2) {
    [0] = >
        object(stdClass) #1854 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
[1] = >
    object(stdClass) #1820 (1) {
    ["name"]= >
    string(5)
"Beyonce"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1814 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1847 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1866 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1820 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1814 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1847 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(2) {
    [0] = >
        object(stdClass) #1875 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
[1] = >
    object(stdClass) #1821 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1786 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1880 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1746 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1815 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1817 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1811 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1874 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1819 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1798 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1820 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1802 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1853 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1741 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1867 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1820 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(0) {}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1688 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1919 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(0) {}
array(0) {}
array(0) {}
array(0) {}
array(0) {}
array(0) {}
array(0) {}
array(0) {}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1889 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(2) {
    [0] = >
        object(stdClass) #1923 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
[1] = >
    object(stdClass) #1927 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(2) {
    [0] = >
        object(stdClass) #1811 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
[1] = >
    object(stdClass) #1904 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1910 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1889 (1) {
    ["name"]= >
        string(6)
    "Miley Cyrus"
}
}
array(1) {
    [0] = >
        object(stdClass) #1927 (1) {
    ["name"]= >
        string(6)
    "Miley Cyrus"
}
}
array(1) {
    [0] = >
        object(stdClass) #1904 (1) {
    ["name"]= >
        string(6)
    "Miley Cyrus"
}
}
array(1) {
    [0] = >
        object(stdClass) #1843 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1860 (1) {
    ["name"]= >
        string(6)
    "Miley Cyrus"
}
}
array(2) {
    [0] = >
        object(stdClass) #1889 (1) {
    ["name"]= >
        string(5)
    "Beyonce"
}
[1] = >
    object(stdClass) #1684 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1843 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(2) {
    [0] = >
        object(stdClass) #1811 (1) {
    ["name"]= >
        string(5)
    "Beyonce"
}
[1] = >
    object(stdClass) #1900 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(2) {
    [0] = >
        object(stdClass) #1904 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
[1] = >
    object(stdClass) #1926 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1915 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(2) {
    [0] = >
        object(stdClass) #1829 (1) {
    ["name"]= >
        string(5)
    "Beyonce"
}
[1] = >
    object(stdClass) #1932 (1) {
    ["name"]= >
    string(10)
"Lady Gaga"
}
}
array(0) {}
array(2) {
    [0] = >
        object(stdClass) #1889 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
[1] = >
    object(stdClass) #1952 (1) {
    ["name"]= >
    string(5)
"Beyonce"
}
}
array(0) {}
array(0) {}
array(2) {
    [0] = >
        object(stdClass) #1915 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
[1] = >
    object(stdClass) #1829 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1932 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1892 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(3) {
    [0] = >
        object(stdClass) #1899 (1) {
    ["name"]= >
        string(5)
    "Beyonce"
}
[1] = >
    object(stdClass) #1929 (1) {
    ["name"]= >
    string(5)
"Beyonce"
}
[2] = >
    object(stdClass) #1805 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1886 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1829 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1802 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(2) {
    [0] = >
        object(stdClass) #1932 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
[1] = >
    object(stdClass) #1941 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(0) {}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1836 (1) {
    ["name"]= >
        string(5)
    "Beyonce"
}
}
array(1) {
    [0] = >
        object(stdClass) #1947 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(2) {
    [0] = >
        object(stdClass) #1917 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
[1] = >
    object(stdClass) #1954 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1902 (1) {
    ["name"]= >
        string(5)
    "Beyonce"
}
}
array(1) {
    [0] = >
        object(stdClass) #1836 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(2) {
    [0] = >
        object(stdClass) #1970 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
[1] = >
    object(stdClass) #1842 (1) {
    ["name"]= >
    string(5)
"Beyonce"
}
}
array(0) {}
array(1) {
    [0] = >
        object(stdClass) #1878 (1) {
    ["name"]= >
        string(5)
    "Beyonce"
}
}
array(2) {
    [0] = >
        object(stdClass) #1802 (1) {
    ["name"]= >
        string(5)
    "Beyonce"
}
[1] = >
    object(stdClass) #1969 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1961 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(2) {
    [0] = >
        object(stdClass) #1836 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
[1] = >
    object(stdClass) #1970 (1) {
    ["name"]= >
    string(5)
"Beyonce"
}
}
array(1) {
    [0] = >
        object(stdClass) #1902 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
}
array(1) {
    [0] = >
        object(stdClass) #1979 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1860 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(1) {
    [0] = >
        object(stdClass) #1946 (1) {
    ["name"]= >
        string(6)
    "Madonna"
}
}
array(3) {
    [0] = >
        object(stdClass) #1926 (1) {
    ["name"]= >
        string(10)
    "Lady Gaga"
}
[1] = >
    object(stdClass) #1848 (1) {
    ["name"]= >
    string(5)
"Beyonce"
}
[2] = >
    object(stdClass) #1912 (1) {
    ["name"]= >
    string(6)
"Madonna"
}
}
array(0) {}

我相信我会无缘无故地感到困惑，但我被困住了。

【问题讨论】：

  • 注意 SQL 注入。如果有多个结果，查询是否会返回一个数组？
  • 我没有完全理解，但是 php (implode) 或 mysql (group concat) 会帮助你。
  • @MattWhipple ：是的，它会返回数组（一些为空）。不过，问题不是查询，我试图通过 foreach 获取字符串中的结果，但我每次只能返回一个结果，而应该有更多结果。谢谢。

标签： php mysql arrays oop multidimensional-array


【解决方案1】：

我认为问题出在这里：

foreach($array as $single) {
    $array = $single->name . ',';
}

$array 只是第一次执行循环时的一个数组，因为在循环内部您为它分配了一个新值。

试试这个：

$names = array();
foreach ($array as $single) {
    $names[] = $single->name;
}
echo implode(', ', $names);

【讨论】：

  • 谢谢@Dale，你是个聪明人。我很惊讶你完全理解我的胡言乱语。这行得通。
【解决方案2】：

我同意 Dale，因为在您的示例中，您将始终获得一个名称（例如，数据库中的最后一个名称），因此您应该在循环时将其放在不同的数组中

【讨论】：

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