PHP图像生成函数实现动态图像生成和处理功能的技巧

$width = 200;
$height = 100;
$image = imagecreatetruecolor($width, $height);

$backgroundColor = imagecolorallocate($image, 255, 255, 255); // 设置背景色为白色
imagefill($image, 0, 0, $backgroundColor);

$textColor = imagecolorallocate($image, 0, 0, 0); // 设置文字颜色为黑色
$text = 'Dynamic Image';
imagestring($image, 5, 10, 10, $text, $textColor); // 在图像上绘制文字

header('Content-Type: image/jpeg');
imagejpeg($image);
imagedestroy($image);

$srcImage = imagecreatefromjpeg('source.jpg');
$dstImage = imagecreatetruecolor($newWidth, $newHeight);
imagecopy($dstImage, $srcImage, 0, 0, $x, $y, $newWidth, $newHeight);

$srcImage1 = imagecreatefromjpeg('source1.jpg');
$srcImage2 = imagecreatefromjpeg('source2.jpg');
imagecopymerge($dstImage, $srcImage1, $x1, $y1, 0, 0, $width, $height, $opacity);
imagecopymerge($dstImage, $srcImage2, $x2, $y2, 0, 0, $width, $height, $opacity);

$srcImage = imagecreatefromjpeg('source.jpg');
$watermarkImage = imagecreatefrompng('watermark.png');
imagecopy($srcImage, $watermarkImage, $x, $y, 0, 0, $width, $height);