php - 使变量在 PHP 函数外可用？

Question

我有这个声明变量的函数:

function imageSize($name, $nr, $category){
    $path = 'ad_images/'.$category.'/'.$name.'.jpg';
    $path_thumb = 'ad_images/'.$category.'/thumbs/'.$name.'.jpg';
    list($width, $height) = getimagesize($path);
    list($thumb_width, $thumb_height) = getimagesize($path_thumb);
        ${'thumb_image_' . $nr . '_width'} = $thumb_width;
        ${'thumb_image_' . $nr . '_height'} = $thumb_height;
        ${'image_' . $nr . '_width'} = $width;
        ${'image_' . $nr . '_height'} = $height;
}

当我回应这个时:

   echo $image_1_width

它工作正常，但如果我在函数外部执行它，它不会识别变量，我怎样才能以某种方式使它们成为“全局”？

谢谢

Answer 1

我强烈建议不要使用全局。

您最好从函数返回:

function imageSize($name, $nr, $category){
    $path = 'ad_images/'.$category.'/'.$name.'.jpg';
    $path_thumb = 'ad_images/'.$category.'/thumbs/'.$name.'.jpg';
    list($width, $height) = getimagesize($path);
    list($thumb_width, $thumb_height) = getimagesize($path_thumb);
        ${'thumb_image_' . $nr . '_width'} = $thumb_width;
        ${'thumb_image_' . $nr . '_height'} = $thumb_height;
        ${'image_' . $nr . '_width'} = $width;
        ${'image_' . $nr . '_height'} = $height;

    $myarr = array();
    $myarr['thumb_image_' . $nr . '_width'] = $thumb_width;
    $myarr['thumb_image_' . $nr . '_height'] = $thumb_height;
    $myarr['image_image_' . $nr . '_width'] = $width;
    $myarr['image_image_' . $nr . '_height'] = $height;
    return $myarr;

}

$myImage = imageSize($name, $nr, $category);

然后你访问每个变量:

echo $myImage['thumb_image_1_width'];
echo $myImage['thumb_image_1_height'];
echo $myImage['image_1_weight'];
echo $myImage['image_1_height'];

等等