如何使用PHP进行图像处理

./configure --prefix=/usr/local/php --with-gd --with-jpeg --with-png --with-freetype-dir=/usr/include/freetype2 --with-zlib-dir=/usr/include --with-xpm-dir=/usr/lib --with-ttf

makemake install

$width = 500;$height = 500;$image = imagecreate($width, $height);

$image = imagecreatefromjpeg("image.jpg");

$width = 200;$height = 200;$target_image = imagecreatetruecolor($width, $height);imagecopyresized($target_image, $image, 0, 0, 0, 0, $width, $height, imagesx($image), imagesy($image));

$angle = 45;$rotate = imagerotate($image, $angle, 0);

$font = 5; // 字体大小$x = 100; // 水印x轴位置$y = 100; // 水印y轴位置$color = imagecolorallocate($image, 255, 255, 255); // 颜色$string = "水印文字"; // 水印文字imagestring($image, $font, $x, $y, $string, $color); // 添加文字水印$watermark = imagecreatefrompng("watermark.png"); // 打开水印图片$watermark_width = imagesx($watermark); // 获取水印图片宽度$watermark_height = imagesy($watermark); // 获取水印图片高度imagecopy($image, $watermark, $x, $y, 0, 0, $watermark_width, $watermark_height);imagedestroy($watermark); // 关闭水印图片

header("Content-type: image/png"); // 输出为png格式imagepng($image);imagedestroy($image); // 关闭图像