Question

我正在尝试获取 true 值，但结果始终显示 false ，如何解决此问题？

$allow = array(
    "pdf"=>"application/pdf",
    "doc"=>"application/msword",
    "docx"=>"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    "docx"=>"application/zip"
);

if (in_array("application/vnd.openxmlformats-officedocument.wordprocessingml.document",$allow)) {
    echo "true";
} else {
    echo "false";
}

在这种情况下，我有两个* .docx文件，但mime类型不同，如何允许它们两个???

Answer 1

问题是数组包含两个具有相同键的项。即，"application/zip"会覆盖"application/vnd.openxmlformats-officedocument.wordprocessingml.document"。以下是print_r($allow);：

的输出

Array
(
    [pdf] => application/pdf
    [doc] => application/msword
    [docx] => application/zip
)

因此，您应为application/zip指定不同的密钥，例如：

$allow = array( "pdf" => "application/pdf",
  "doc" => "application/msword",
  "docx" => "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
  "zip" => "application/zip"
);

Answer 2

我可以看到keys在你的情况下并不重要。您可以使用indexed array代替multidimensional array。

$allow = array("application/pdf",
               "application/msword",
               "application/vnd.openxmlformats-officedocument.wordprocessingml.document", 
               "application/zip");

如果你真的想使用多维数组，那么

为这两个哑剧使用不同的键，例如docx1, docx2。

$allow = array(
    "pdf"=>"application/pdf",
    "doc"=>"application/msword",
    "docx1"=>"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    "docx2"=>"application/zip"
);

Answer 3

这可能会对您有所帮助，请尝试以下解决方案。您可以将docx作为一个键值，并将mime设置为逗号分隔。

 $allow = array(
    "pdf" => "application/pdf",
    "doc" => "application/msword",
    "docx" => "application/vnd.openxmlformats-officedocument.wordprocessingml.document", "application/zip",
);

$allownew = array_values($allow);


if (in_array("application/vnd.openxmlformats-officedocument.wordprocessingml.document", $allownew))
{
    echo "true";
}
else
{
    echo "false";
}

Answer 4

也许你应该尝试用＃34;翻转＆＃34;数组的版本：

$allow = array(
    "application/pdf"=>"pdf",
    "application/msword"=>"doc",
    "application/vnd.openxmlformats-officedocument.wordprocessingml.document"=>"docx",
    "application/zip"=>"docx"
  );

现在，当然，您需要搜索数组的键，而不是像

这样的值

$k="application/vnd.openxmlformats-officedocument.wordprocessingml.document";
If (array_key_exists($k,$array)) echo $array[$k]; // docx

Answer 5

检查数组

$allow = array(
    "pdf"=>"application/pdf",
    "doc"=>"application/msword",
    "docx"=>"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    "docx"=>"application/zip" // this will be overridden by above index.
  );

  if(in_array("application/vnd.openxmlformats-officedocument.wordprocessingml.document",$allow)){
    echo "true";
  }else{
    echo "false";
  }

你的数组有相同的键，docx，所以最后一个键将被旧的重写。

在你的情况下

"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
overriden by "application/zip"

修改

$allow = [ "pdf"=>"application/pdf", "doc"=>"application/msword", "docx"=>[ "docx"=>"application/zip", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"] ];

条件将是。

function in_array_r($needle, $haystack, $strict = false) { foreach ($haystack as $item) { if (($strict ? $item === $needle : $item == $needle) || (is_array($item) && in_array_r($needle, $item, $strict))) { return true; } } return false; } echo in_array_r("application/vnd.openxmlformats-officedocument.wordprocessingml.document", $allow) ? 'true' : 'false';

我参考了link。

检查值存在于具有相同键值的数组中

5 个答案: