PHP - 使用imagecopy函数垂直合并两个图像 [英] PHP - Merge two images vertically using imagecopy function

问题描述

我必须垂直合并两个PNG图像。

I have to merge two PNG images vertically.

//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）

But I need to merge the images one after bottom one.(vertically)

如何在第一张图片底部后合并第二张图片？

How to merge that second image after bottom of first image?

请提供意见！

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：

推荐答案

当我考虑这个功能时

imagecopy（资源$ dst_im，资源$ src_im，int $ dst_x，int $ dst_y，int $ src_x，int $ src_y，int $ src_w，int $ src_h）

imagecopy ( resource $dst_im , resource$src_im , int $dst_x , int $dst_y , int $src_x , int$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。

It says that the dst_x and dst_y should be the x-coordinate of destination point and y-coordinate of destination point respectively.

所以要垂直合并两个图像，它应该是这样的。

So to merge two images vertically, it should be something like this.

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

你还应该改变根据最终结果的需要， $ merged_width 和 $ merged_height 变量值。更改以下两行，

You should also change the $merged_width and $merged_height variable values as needed for the final result. Change the following two lines,

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

如下所示，

$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);

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