Question

我在组合少数数组时遇到问题，第二个数组的索引必须存在但不能作为合并数组的值。

例如，这3个数组：



    $a[0] = 'some A string';
    $a[1] = 'some A string';
    $a[2] = 'some A string';
    $a[4] = 'some A string';
    $a[6] = 'some A string';
    $a[8] = 'some A string';
    $a[10] = 'some A string';

    $b[1] = 'some B string';
    $b[3] = 'some B string';
    $b[5] = 'some B string';
    $b[7] = 'some B string';
    $b[9] = 'some B string';
    $b[11] = 'some B string';

    $c[0] = 'some C string';
    $c[1] = 'some C string';
    $c[3] = 'some C string';
    $c[6] = 'some C string';
    $c[9] = 'some C string';
    $c[12] = 'some C string';
    $c[15] = 'some C string';

应改写为：



    Array
    (
        [0] => some A string
        [1] => some A string
        [2] => some A string
        [3] => blabla
        [4] => some A string
        [5] => blabla
        [6] => some A string
        [7] => blabla
        [8] => some A string
        [9] => blabla
        [10] => some A string
        [11] => blabla
        [12] => blabla
        [15] => blabla
    )
    Array
    (
        [0] => blabla
        [1] => some B string
        [2] => blabla
        [3] => some B string
        [4] => blabla
        [5] => some B string
        [6] => blabla
        [7] => some B string
        [8] => blabla
        [9] => some B string
        [10] => blabla
        [11] => some B string
        [12] => blabla
        [15] => blabla
    )
    Array
    (
        [0] => some C string
        [1] => some C string
        [2] => blabla
        [3] => some C string
        [4] => blabla
        [5] => blabla
        [6] => some C string
        [7] => blabla
        [8] => blabla
        [9] => some C string
        [10] => blabla
        [11] => blabla
        [12] => some C string
        [15] => some C string
    )

可以有超过3个这样的阵列。如何实现这样的结果，为每个用“blabla”填充的数组而不是从其他表中获取的值具有非常相同数量的键？

Answer 1

编辑数组的动态长度

<?php
    $a = array();
     $a[0] = 'some A string';
        $a[1] = 'some A string';
        $a[2] = 'some A string';
        $a[4] = 'some A string';
        $a[6] = 'some A string';
        $a[8] = 'some A string';
        $a[10] = 'some A string';


    end($a); 
    $last = key($a);


    $returnarray = array();    
    for ($i = 0; $i <= $last; $i++) {
        if(isset($a[$i])) {
            $returnarray[] = $a[$i];
        }else{
           $returnarray[] = "blabla";
        }
    } 

    print_r($returnarray);

Answer 2

首先，您需要获取密钥列表。

最简单的方法是创建超级数组并获取所有密钥。

$mega=array();

$mega=$a+$b+$c;

然后你想用array_keys（）;

获取所有键

$keys=array_keys($mega);

然后你想要遍历你的密钥，找出哪些数组有哪些，哪些没有。如果您只有3个阵列，那么您可以手动迭代所有3个阵列。

完整版的工作代码：

<?php
$a[0] = 'some A string';
$a[1] = 'some A string';
$a[2] = 'some A string';
$a[4] = 'some A string';
$a[6] = 'some A string';
$a[8] = 'some A string';
$a[10] = 'some A string';

$b[1] = 'some B string';
$b[3] = 'some B string';
$b[5] = 'some B string';
$b[7] = 'some B string';
$b[9] = 'some B string';
$b[11] = 'some B string';

$c[0] = 'some C string';
$c[1] = 'some C string';
$c[3] = 'some C string';
$c[6] = 'some C string';
$c[9] = 'some C string';
$c[12] = 'some C string';
$c[15] = 'some C string';
$mega=array();
$mega=$a+$b+$c;
$keys=array_keys($mega);
$resulting_array=array();

foreach($keys as $key)
{
        if(isset($a[$key]))
                $resulting_array[0][$key]=$a[$key];
        else
                $resulting_array[0][$key]='blah';

}

foreach($keys as $key)
{
        if(isset($b[$key]))
                $resulting_array[1][$key]=$b[$key];
        else
                $resulting_array[1][$key]='blah';

}

foreach($keys as $key)
{
        if(isset($c[$key]))
                $resulting_array[2][$key]=$c[$key];
        else
                $resulting_array[2][$key]='blah';

}

var_dump($resulting_array);

输出：

array(3) {
  [0]=>
  array(14) {
    [0]=>
    string(13) "some A string"
    [1]=>
    string(13) "some A string"
    [2]=>
    string(13) "some A string"
    [4]=>
    string(13) "some A string"
    [6]=>
    string(13) "some A string"
    [8]=>
    string(13) "some A string"
    [10]=>
    string(13) "some A string"
    [3]=>
    string(4) "blah"
    [5]=>
    string(4) "blah"
    [7]=>
    string(4) "blah"
    [9]=>
    string(4) "blah"
    [11]=>
    string(4) "blah"
    [12]=>
    string(4) "blah"
    [15]=>
    string(4) "blah"
  }
  [1]=>
  array(14) {
    [0]=>
    string(4) "blah"
    [1]=>
    string(13) "some B string"
    [2]=>
    string(4) "blah"
    [4]=>
    string(4) "blah"
    [6]=>
    string(4) "blah"
    [8]=>
    string(4) "blah"
    [10]=>
    string(4) "blah"
    [3]=>
    string(13) "some B string"
    [5]=>
    string(13) "some B string"
    [7]=>
    string(13) "some B string"
    [9]=>
    string(13) "some B string"
    [11]=>
    string(13) "some B string"
    [12]=>
    string(4) "blah"
    [15]=>
    string(4) "blah"
  }
  [2]=>
  array(14) {
    [0]=>
    string(13) "some C string"
    [1]=>
    string(13) "some C string"
    [2]=>
    string(4) "blah"
    [4]=>
    string(4) "blah"
    [6]=>
    string(13) "some C string"
    [8]=>
    string(4) "blah"
    [10]=>
    string(4) "blah"
    [3]=>
    string(13) "some C string"
    [5]=>
    string(4) "blah"
    [7]=>
    string(4) "blah"
    [9]=>
    string(13) "some C string"
    [11]=>
    string(4) "blah"
    [12]=>
    string(13) "some C string"
    [15]=>
    string(13) "some C string"
  }
}

Answer 3

这就是你想要的。

$a[0] = 'some A string';
$a[1] = 'some A string';
$a[2] = 'some A string';
$a[4] = 'some A string';
$a[6] = 'some A string';
$a[8] = 'some A string';
$a[10] = 'some A string';

$arr=[];

for($i=0; $i<=15; $i++){
    if(!isset($a[$i]))
        $a[$i]='blabla';
    array_push($arr, $a[$i]);
}

echo "<pre>";
print_r($arr);
echo "</pre>";

PHP如何组合多个数组

3 个答案: