PHP Switch Case 问题

Question

我正在使用此功能在图像、jpeg 或 png 的左上角添加水印。

我需要 Switch 和 Case 来区分 png 和 jpeg 以分别处理每种图像类型。

每次我运行函数，图像编辑完美，但是调试显示图像正在处理为 .png 和 .jpg 因此当图像错误时会出现问题类型。

function addWatermark($path)
{
    $public_file_path = dirname(__FILE__);
    $font = $public_file_path . '/src/fonts/Roboto-Light.ttf'; 
    // get fiel type for switch
    $size = getimagesize($path);
    // get $from name
    $path_parts = pathinfo($path); 
    $text= $path_parts['filename'];
    switch($path_parts['extension'])
    {
        case "jpeg" or "jpg":
            // Copy and resample the imag
            list($width, $height) = getimagesize($path);
            $image_p = imagecreatefromjpeg($path);
            // Prepare font size and colors
            $text_color = imagecolorallocate($image_p, 0, 0, 0);
            $bg_color = imagecolorallocate($image_p, 255, 255, 255);
            $font_size = 17; 
            // Set the offset x and y for the text position
            $offset_x = 0;
            $offset_y = 20;
            // Get the size of the text area
            $dims = imagettfbbox($font_size, 0, $font, $text);
            $text_width = $dims[4] - $dims[6] + $offset_x;
            $text_height = $dims[3] - $dims[5] + $offset_y;
            // Add text background
            imagefilledrectangle($image_p, 0, 0, $text_width, $text_height, $bg_color);
            // Add text
            imagettftext($image_p, $font_size, 0, $offset_x, $offset_y, $text_color, $font, $text);
            // Save the picture
            imagejpeg($image_p, $path, 90); 
            // Clear
            imagedestroy($image_p);
        case "png":
            $im = imagecreatefrompng($path);
            imagesavealpha($im, true); // important to keep the png's transparency 
            $text_color = imagecolorallocate($im, 0, 0, 0);
            $width = imagesx($im); // the width of the image
            $height = imagesy($im);; // the heighst of the image
            $font_size = 15; // font size
            $box_color = imagecolorallocate($im, 255, 255, 255);
            // Set the offset x and y for the text position
            $offset_x = 0;
            $offset_y = 20;
            $dims = imagettfbbox($font_size, 0, $font, $text);
            $text_width = $dims[4] - $dims[6] + $offset_x;
            $text_height = $dims[3] - $dims[5] + $offset_y;
            // Add text background
            imagefilledrectangle($im, 0, 0, $text_width, $text_height, $box_color);
            // Add text
            imagettftext($im, $font_size, 0, $offset_x, $offset_y, $text_color, $font,$text);
            imagepng($im, $path, 0);
            imagedestroy($im);
        case "mp4";
            break;
    }
    // hasta aca
}

Answer 1

您需要将 break; 添加到您的案例陈述中。

switch($path_parts['extension'])
{
    case "jpeg":
    case "jpg":
        // Your code
        break;
    case "png":
        // Your code
        break;
    case "mp4";
        break;
}

Answer 2

我认为您不能在 case 语句中使用 or。在此示例中，所有内容都将匹配第一种情况：http://sandbox.onlinephpfunctions.com/code/8edfd01d386e9f7bb56975b9b1ecb9dee4669494

您的代码应该是：

switch($path_parts['extension'])
{
    case "jpeg":
    case "jpg":
        // Your code
        break;
    case "png":
        // Your code
        break;
    case "mp4";
        break;
}

Answer 3

看来您可能缺少 break 语句，我不确定 case('jpg') 或 case('jpeg') 是否有效。您可以使用此替代方法：

switch(var) {
    case('jpg'):
    case('jpeg'):
break;

case('png'):
break;

default:
break;
}

PHP Switch Case 问题

PHP Switch Case problems

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