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我将图像大小调整为 100 x 100 图像，效果很好。

但是.....我想保持原来的纵横比。因此，我需要确定原始图像的宽度或高度是否更大，然后用透明度填充 100 x 100 图像的其余部分。

因此，如果纵向，高度将为 100，图像的右侧和左侧将是透明度。

横向，宽度将是 100，图像的顶部和底部将是透明的。

这可能吗？

这是我的功能

// This function will proportionally resize image 
function resizeImage($CurWidth,$CurHeight,$MaxSize,$DestFolder,$SrcImage,$Quality,$ImageType)
{
    //Check Image size is not 0
    if($CurWidth <= 0 || $CurHeight <= 0) 
    {
        return false;
    }

    //Check Image size is not 0
    else if($CurWidth >= 1 && $CurWidth <= 100 || $CurHeight >= 1 && $CurHeight <= 100) 
    {
    //Construct a proportional size of new image
    $NewWidth           = $CurWidth;
    $NewHeight          = $CurHeight;
    $NewCanves          = imagecreatetruecolor($NewWidth, $NewHeight);
    }
    else if($CurWidth >= 101 || $CurHeight >= 101) 
    {
    //Construct a proportional size of new image
    $ImageScale         = min($MaxSize/$CurWidth, $MaxSize/$CurHeight); 
    $NewWidth           = ceil($ImageScale*$CurWidth);
    $NewHeight          = ceil($ImageScale*$CurHeight);
    $NewCanves          = imagecreatetruecolor($NewWidth, $NewHeight);
    }

    /* fix PNG transparency issues */                       
    imagefill($NewCanves, 0, 0, IMG_COLOR_TRANSPARENT);         
    imagesavealpha($NewCanves, true);      
    imagealphablending($NewCanves, true);                 

    // Resize Image
    if(imagecopyresampled($NewCanves, $SrcImage,0, 0, 0, 0, $NewWidth, $NewHeight, $CurWidth, $CurHeight))
    {
        switch(strtolower($ImageType))
        {
            case 'image/PNG':
            case 'image/png':
                imagepng($NewCanves,$DestFolder);
                break;
            case 'image/gif':
                imagegif($NewCanves,$DestFolder);
                break;          
            case 'image/JPG':
            case 'image/JPEG':
            case 'image/jpeg':
            case 'image/pjpeg':
                imagejpeg($NewCanves,$DestFolder,$Quality);
                break;
            default:
                return false;
        }
    //Destroy image, frees memory   
    if(is_resource($NewCanves)) {imagedestroy($NewCanves);} 
    return true;
    }

}
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