Question

如果我让出版物询问，请用户讽刺评论，这是因为我无法做到。

我需要知道是否有一个原生的PHP函数允许我获取数组的所有值，指定要获取的索引，不用循环，例如

我在函数中列出了这个数组：

function get_mime($index)
{
    $data = array(
        'jpg' => 'image/jpeg',
        'png' => 'image/png',
        'gif' => 'image/gif',
        'zip' => 'application/x-compressed',
        'doc' => 'application/msword',
        'dot' => 'application/msword',
        'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
        'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
        'docm' => 'application/vnd.ms-word.document.macroEnabled.12',
        'dotm' => 'application/vnd.ms-word.template.macroEnabled.12',
        'xls' => 'application/vnd.ms-excel',
        'xlt' => 'application/vnd.ms-excel',
        'xla' => 'application/vnd.ms-excel',
        'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
        'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
        'xlsm' => 'application/vnd.ms-excel.sheet.macroEnabled.12',
        'xltm' => 'application/vnd.ms-excel.template.macroEnabled.12',
        'xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12',
        'xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
        'ppt' => 'application/vnd.ms-powerpoint',
        'pot' => 'application/vnd.ms-powerpoint',
        'pps' => 'application/vnd.ms-powerpoint',
        'ppa' => 'application/vnd.ms-powerpoint',
        'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
        'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
        'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
        'ppam' => 'application/vnd.ms-powerpoint.addin.macroEnabled.12',
        'pptm' => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12',
        'potm' => 'application/vnd.ms-powerpoint.template.macroEnabled.12',
        'ppsm' => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12'
    );
    return $data;
}

我需要调用此函数：

get_mime(array('jpg', 'png', 'gif'));

并返回包含值的数组：

array('image/jpeg', 'image/png', 'image/gif')

重要提示：我想在不使用循环的情况下使用本机PHP函数执行此操作。

非常感谢你的帮助。

Answer 1

$ res = array_intersect_key（array_flip（[＆＃39; jpg＆＃39;，＆＃39; png＆＃39;，＆＃39; gif＆＃39;]），$ data）;

Answer 2

function get_mime($index)
{
    $data = array(
       //...
    );
    return array_values(
        array_intersect_key(
            $data, array_combine(
                $index, array_fill(
                    0, count($index)
                )
            )
        )
    );
}

从技术上讲，这只是没有PHP循环的本机函数。但是当然，在引擎盖下，PHP会多次遍历这两个数组。

我不会建议这个解决方案。通常，简单的for循环更有效，更易读。

Answer 3

我试过这种方式：

function get_mime($indices)
{
    $data = array(
        'jpg' => 'image/jpeg',
        'png' => 'image/png',
        'gif' => 'image/gif',
        'zip' => 'application/x-compressed',
        'doc' => 'application/msword',
        'dot' => 'application/msword',
        'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
        'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
        'docm' => 'application/vnd.ms-word.document.macroEnabled.12',
        'dotm' => 'application/vnd.ms-word.template.macroEnabled.12',
        'xls' => 'application/vnd.ms-excel',
        'xlt' => 'application/vnd.ms-excel',
        'xla' => 'application/vnd.ms-excel',
        'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
        'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
        'xlsm' => 'application/vnd.ms-excel.sheet.macroEnabled.12',
        'xltm' => 'application/vnd.ms-excel.template.macroEnabled.12',
        'xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12',
        'xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
        'ppt' => 'application/vnd.ms-powerpoint',
        'pot' => 'application/vnd.ms-powerpoint',
        'pps' => 'application/vnd.ms-powerpoint',
        'ppa' => 'application/vnd.ms-powerpoint',
        'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
        'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
        'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
        'ppam' => 'application/vnd.ms-powerpoint.addin.macroEnabled.12',
        'pptm' => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12',
        'potm' => 'application/vnd.ms-powerpoint.template.macroEnabled.12',
        'ppsm' => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12'
    );
    $init = array_intersect_key( $data, array_flip($indices) );
    $init = array_values ($init);
    return $init;
}

$indices = array('jpg', 'png');
echo print_r(get_mime( $indices ));

PHP - Native函数，用于通过索引

3 个答案: