PHP - 使用imagecopy函数垂直合并两个图像

Question

我必须垂直合并两个PNG图像。

//place at right side of $img1
imagecopy($merged_image, $img2, $img1_width, 0, 0, 0, $img2_width, $img2_height);

但我需要在底部之后合并图像。（垂直）

如何在第一张图像的底部合并第二张图像？

请指教！

PHP代码

$img1_path = 'images/1.png';
$img2_path = 'images/2.png';

list($img1_width, $img1_height) = getimagesize($img1_path);
list($img2_width, $img2_height) = getimagesize($img2_path);

$merged_width  = $img1_width + $img2_width;
//get highest
$merged_height = $img1_height > $img2_height ? $img1_height : $img2_height;

$merged_image = imagecreatetruecolor($merged_width, $merged_height);

imagealphablending($merged_image, false);
imagesavealpha($merged_image, true);

$img1 = imagecreatefrompng($img1_path);
$img2 = imagecreatefrompng($img2_path);

imagecopy($merged_image, $img1, 0, 0, 0, 0, $img1_width, $img1_height);
//place at right side of $img1
imagecopy($merged_image, $img2, $img1_width, 0, 0, 0, $img2_width, $img2_height);

//save file or output to broswer
$SAVE_AS_FILE = TRUE;
if( $SAVE_AS_FILE ){
    $save_path = "images/Sample_Output.png";
    imagepng($merged_image,$save_path);
}else{
    header('Content-Type: image/png');
    imagepng($merged_image);
}

//release memory
imagedestroy($merged_image);

输出：

Answer 1

当我考虑功能

时

  

imagecopy的（资源$ dst_im和，资源$和src_im，INT $ dst_x，INT $ dst_y，INT $从src_x，INT $ src_y，INT $ src_w，INT $ src_h）

它表示dst_x和dst_y应分别是目标点的x坐标和目标点的y坐标。

因此要垂直合并两个图像，它应该是这样的。

imagecopy($merged_image, $img2, 0,$img1_height , 0, 0, $img2_width, $img2_height);

您还应根据需要更改最终结果的$merged_width和$merged_height变量值。更改以下两行，

$merged_width = $img1_width + $img2_width; //get highest 
$merged_height = $img1_height > $img2_height ? $img1_height : $img2_height; 

如下，

$merged_width = $img1_width > $img2_width ? $img1_width : $img2_width; //get highest width as result image width
$merged_height = $img1_height + $img2_height;

最终结果：

$img1_path = 'images/1.png';
$img2_path = 'images/2.png';

list($img1_width, $img1_height) = getimagesize($img1_path);
list($img2_width, $img2_height) = getimagesize($img2_path);

$merged_width = $img1_width > $img2_width ? $img1_width : $img2_width; //get highest width as result image width
$merged_height = $img1_height + $img2_height;

$merged_image = imagecreatetruecolor($merged_width, $merged_height);

imagealphablending($merged_image, false);
imagesavealpha($merged_image, true);

$img1 = imagecreatefrompng($img1_path);
$img2 = imagecreatefrompng($img2_path);

imagecopy($merged_image, $img1, 0, 0, 0, 0, $img1_width, $img1_height);
//place at right side of $img1
imagecopy($merged_image, $img2, 0,$img1_height , 0, 0, $img2_width, $img2_height);

//save file or output to broswer
$SAVE_AS_FILE = TRUE;
if( $SAVE_AS_FILE ){
    $save_path = "images/Sample_Output.png";
    imagepng($merged_image,$save_path);
}else{
    header('Content-Type: image/png');
    imagepng($merged_image);
}

//release memory
imagedestroy($merged_image);