如何在 php 中从数组中删除空值和空值 - How to remove empty and null values from an array in php?

How to remove empty and null values from an array in php?

本文关键字：空值删除数组 php | 更新日期: 2023-09-27

我想从数组中删除空值和空值$listValues。在这里，我使用 array_filter 删除了空值。示例代码：

$listValues = array("one", "two", "null","three","","four","null");
$resultValues = array_filter($listValues);
echo "<pre>";
print_r($resultValues);
echo "</pre>";

结果：

Array ( [0] => one [1] => two [2] => null [3] => three [5] => four [6] => null )

但我想

Array ( [0] => one [1] => two [3] => three [5] => four )

任何建议都非常感谢。

试试这个：使用 array_diff（）函数比较两个（或多个）数组的值，并返回差异。以删除 null 和 " 。如果您需要删除更多字段，请在数组中添加该值

<?php
$listValues = array("one", "two", "null","three","","four","null");
echo "<pre>";
$a=array_values(array_diff($listValues,array("null","")));
print_r($a);
echo "</pre>";
?>

输出：

Array
(
    [0] => one
    [1] => two
    [2] => three
    [3] => four
)

指http://www.w3schools.com/php/func_array_diff.asp

尝试使用第二个参数作为用户定义的函数array_filter，如下所示：

$listValues = array("one", "two", "null","three","","four","null");
print_r(array_filter($listValues, "filter"));
function filter($elmnt) {
    if ($elmnt != "null" && $elmnt != "" ) {
        return $elmnt;
    }
}

使用以下代码，首先我更正了一个数组的索引，然后从数组中取消设置空值，然后再次更正数组索引：

$listValues = array("one", "two", "null","three","","four","null");
$listValues = array_values($listValues);
$temp = $listValues;
for($loop=0; $loop<count($listValues); $loop++){
    if($listValues[$loop] == "" || $listValues[$loop] == "null"){
        unset($temp[$loop]);
    }
}
$listValues = $temp;
$listValues = array_values($listValues);
echo "<pre>";
print_r($listValues);
echo "</pre>"; die;

但是，如果您希望相同的索引获得此输出：

Array ( [0] => one [1] => two [3] => three [5] => four )

那么在<pre>之前不要使用它：

$listValues = array_values($listValues);