PHP 从数组中提取具有共同名称的元素

Question

我只想提取名称的特定部分并测试它是否已设置 (isset)？

专用于largeImage_1, largeImage_2等.

这个是我试过的，但是好像return也没有测试过。

if ($_POST['tutorial']) {

  foreach ( $_POST['tutorial'] as $key => $value ) {

    if ('largeImage' === substr($key, 0 , 10) )
      {
           echo $value;
      }

  }

} 

Array
(
[title] => title
[tutorial] => Array
    (
        [1] => Array
            (
                [largeImage_1] => Array
                    (
                        [0] => image.png
                        [1] => image.png
                    )

            )

        [2] => Array
            (
                [largeImage_2] => Array
                    (
                        [0] => image.png
                    )

            )

    )

[name] => ""; 

)

Answer 1

您需要在另一个循环中使用一个循环来访问 'largeImage_1'、'largeImage_2'.

等键

if ($_POST['tutorial']) {
  foreach ( $_POST['tutorial'] as $key => $value ) {
        foreach ( $value as $k => $v ) {
            if ('largeImage' === substr($k, 0 , 10) )
            {
                //your code here
            }
        }
    }
}

PHP 从数组中提取具有共同名称的元素

PHP extract elements from an array which have a common name

php

arrays

multidimensional-array