如何在php中为数组_combine填充KEY=>value中的空值

我希望将键和值与2个数组组合，但这两个数组并不相等

$array1 = array("1","2","3","4","5");
$array2 = array("apple","banana","","dog","");
$key_value = array_combine($array1,$array2);

输出为：

array_combine：两个参数的元素数应该相等

但我需要的是

print_r($key_value);
array(5) { 
          [1]=> string(5) "apple" 
          [2]=> string(6) "banana" 
          [3]=> string(8) "No Value" 
          [4]=> string(3) "dog" 
          [5]=> string(8) "No Value" 
         }

如果为空，如何执行此操作，请插入无值文本。

您可以通过foreach循环执行此操作：

输出：

Array
(
    [1] => apple
    [2] => banana
    [3] => No Value
    [4] => dog
    [5] => No Value
)

使用数组映射和数组组合

Array
(
    [1] => apple
    [2] => banana
    [3] => No Value
    [4] => dog
    [5] => No Value
)

<?php

$array1 = array("1","2","3","4","5");
$array2 = array("apple","banana","","dog","");

 $array2 = array_map(function($v){
        return (empty($v)) ? "No Value" : $v;
    },$array2);

$key_value = array_combine($array1,$array2);
print_r($key_value);