从数组中的一个键获取所有值

Question

我想将所有“file_name”值放入一个变量中，以便能够将其作为逗号分隔的字符串保存到我的数据库中。

    array (size=13)
  0 => 
    array (size=14)
      'file_name' => string '__0000132.jpg' (length=13)
      'file_type' => string 'image/jpeg' (length=10)
      'file_path' => string 'C:/wamp/www/mou/uploads/items/' (length=30)
      'full_path' => string 'C:/wamp/www/mou/uploads/items/__0000132.jpg' (length=43)
      'raw_name' => string '__0000132' (length=9)
      'orig_name' => string '__00001.jpg' (length=11)
      'client_name' => string '__00001.jpg' (length=11)
      'file_ext' => string '.jpg' (length=4)
      'file_size' => float 2.16
      'is_image' => boolean true
      'image_width' => int 300
      'image_height' => int 300
      'image_type' => string 'jpeg' (length=4)
      'image_size_str' => string 'width="300" height="300"' (length=24)
  1 => 
    array (size=14)
      'file_name' => string '0132.jpg' (length=8)
      'file_type' => string 'image/jpeg' (length=10)
      'file_path' => string 'C:/wamp/www/mou/uploads/items/' (length=30)
      'full_path' => string 'C:/wamp/www/mou/uploads/items/0132.jpg' (length=38)
      'raw_name' => string '0132' (length=4)
      'orig_name' => string '01.jpg' (length=6)
      'client_name' => string '01.jpg' (length=6)
      'file_ext' => string '.jpg' (length=4)
      'file_size' => float 271.2
      'is_image' => boolean true
      'image_width' => int 580
      'image_height' => int 714
      'image_type' => string 'jpeg' (length=4)
      'image_size_str' => string 'width="580" height="714"' (length=24)
  2 => 
    array (size=14)
      'file_name' => string 'CM_logo32.png' (length=13)
      'file_type' => string 'image/png' (length=9)
      'file_path' => string 'C:/wamp/www/mou/uploads/items/' (length=30)
      'full_path' => string 'C:/wamp/www/mou/uploads/items/CM_logo32.png' (length=43)
      'raw_name' => string 'CM_logo32' (length=9)
      'orig_name' => string 'CM_logo.png' (length=11)
      'client_name' => string 'CM_logo.png' (length=11)
      'file_ext' => string '.png' (length=4)
      'file_size' => float 24.61
      'is_image' => boolean true
      'image_width' => int 393
      'image_height' => int 404
      'image_type' => string 'png' (length=3)
      'image_size_str' => string 'width="393" height="404"' (length=24)
  3 => 
    array (size=14)
      'file_name' => string 'download32.png' (length=14)
      'file_type' => string 'image/png' (length=9)
      'file_path' => string 'C:/wamp/www/mou/uploads/items/' (length=30)
      'full_path' => string 'C:/wamp/www/mou/uploads/items/download32.png' (length=44)
      'raw_name' => string 'download32' (length=10)
      'orig_name' => string 'download.png' (length=12)
      'client_name' => string 'download.png' (length=12)
      'file_ext' => string '.png' (length=4)
      'file_size' => float 33.18
      'is_image' => boolean true
      'image_width' => int 160
      'image_height' => int 120
      'image_type' => string 'png' (length=3)
      'image_size_str' => string 'width="160" height="120"' (length=24)

我正在使用 codeigniter，这是我的库从 $this->upload->get_multi_upload_data() 返回的内容；图书馆 ->> https://github.com/stvnthomas/CodeIgniter-Multi-Upload

任何帮助将不胜感激

Answer 1

如果你的 PHP >= 5.5，你可以使用array_column()

$results = array_column($myArray, 'file_name');

对于早期版本的PHP，可以使用

$results = array_map(
    function ($value) {
        return $value['file_name'];
    }
    $myArray
);

但是在数据库中保存为逗号分隔的字符串并不是一个好的建议：它几乎无法搜索（您不能使用索引进行搜索，所以它是一个完整的扫描）并且它也变得非常难以修改

Answer 2

我发现了它是什么。

基本上少了一个逗号。

 $fileData =$this->upload->get_multi_upload_data();
    $results = array_map(
        function ($fileData) {
            return $fileData['file_name'];
        },
        $fileData
    );

返回来自 Codeigniter 库 https://github.com/stvnthomas/CodeIgniter-Multi-Upload 的文件名数组