Question

这是数组，我只需删除数组的最后一个空值，如rtrim 。

[0] => Array
    (
        [0] => 6
        [1] => 50967
        [2] => 50647
        [3] => 4024
        [4] => 
        [5] => testme
        [6] => 125
        [7] => onlinecode.org
        [8] => 
        [9] => You
        [10] => 4
        [11] => Toys
        [12] => 135
        [13] => 
        [14] => 
        [15] => 
    )

我正在使用此代码：

print_r(array_filter($arr, 'strlen'));

但它删除了数组的所有空值。

预期产出：

[0] => Array
    (
        [0] => 6
        [1] => 50967
        [2] => 50647
        [3] => 4024
        [4] => 
        [5] => testme
        [6] => 125
        [7] => onlinecode.org
        [8] => 
        [9] => You
        [10] => 4
        [11] => Toys
        [12] => 135
    )

Answer 1

假设$ arr是二维数组（在OP中没有清楚地显示），如果为空，这将删除每个子数组的最后一个成员：

foreach ($arr as $key => $val) {
    if (trim($val[count($val) - 1]) == '') {
        unset($val[count($val) - 1]);
    }
}

Answer 2

以下代码将执行您想要的操作：

<?php
$a = 1;
$b = 2;
$c = 3;
$d = 4;

$arr = array(
array ( $b, $d, $c, $a, $b),
array ($c, $a),
array ( $b, $d,  $c ),
array( $c, $d, $a, $b, $b)
);
echo "before:\n";
print_r($arr);

foreach($arr as $k1=>$q) {
  foreach($q as $k2=>$r) {
    if($r == $c) {
      unset($arr[$k1][$k2]);
    }
  }
}
echo "after:\n";
print_r($arr);
?>

输出：

before:
Array
(
    [0] => Array
        (
            [0] => 2
            [1] => 4
            [2] => 3
            [3] => 1
            [4] => 2
        )

    [1] => Array
        (
            [0] => 3
            [1] => 1
        )

    [2] => Array
        (
            [0] => 2
            [1] => 4
            [2] => 3
        )

    [3] => Array
        (
            [0] => 3
            [1] => 4
            [2] => 1
            [3] => 2
            [4] => 2
        )

)
after:
Array
(
    [0] => Array
        (
            [0] => 2
            [1] => 4
            [3] => 1
            [4] => 2
        )

    [1] => Array
        (
            [1] => 1
        )

    [2] => Array
        (
            [0] => 2
            [1] => 4
        )

    [3] => Array
        (
            [1] => 4
            [2] => 1
            [3] => 2
            [4] => 2
        )

)

正如你所看到的，所有3个已经消失了......

Answer 3

您可以测试最后一个数组项，如果它是空的，请将其删除。

修改增加了对OP $arr

的多维度的支持

$found_value = 0;
foreach ($arr as &$array) {
    do {
        if (empty(($array[count($array)-1]))) {
            array_pop($array);
        } else {
            $found_value = 1;
        }
    } while (empty($found_value));
}

这是已更新 pastebin showing it works

Answer 4

您可以使用PHP array_reverse来解决您的问题。你可以这样做：

// Let Array be
$arr = [1, 2, 3, 4, null, 6, null, null];

foreach (array_reverse($arr) as $value) {
    if(is_null($value)) {
        unset($arr[count($arr) - 1]);
    } else {
        break;
    }
}
print_r($arr);

/* Output
array:7 [
  0 => 1
  1 => 2
  2 => 3
  3 => 4
  4 => null
  5 => 6
] */

希望这有帮助！

Answer 5

使用分隔符将Array转换为字符串。然后修剪最后的分隔线。终于转回来了。

<?php

$multiArray = [ 
                [1,2,3,4,null,6,null,null],
                [2,3,4,5,null, 8, null, 8, null, null]
              ];

var_dump(array_map("mytrim", $multiArray));


function mytrim($array)
{
  return explode(',', rtrim( implode(',', $array), ','));
}

然后输出：

kris-roofe@krisroofe-Rev-station:~$ php cal.php 
array(2) {
  [0]=>
  array(6) {
    [0]=>
    string(1) "1"
    [1]=>
    string(1) "2"
    [2]=>
    string(1) "3"
    [3]=>
    string(1) "4"
    [4]=>
    string(0) ""
    [5]=>
    string(1) "6"
  }
  [1]=>
  array(8) {
    [0]=>
    string(1) "2"
    [1]=>
    string(1) "3"
    [2]=>
    string(1) "4"
    [3]=>
    string(1) "5"
    [4]=>
    string(0) ""
    [5]=>
    string(1) "8"
    [6]=>
    string(0) ""
    [7]=>
    string(1) "8"
  }
}

删除数组中的最后一个null值

5 个答案: