PHP GD 入门使用

# 在临时目录进行操作
cd /tmp

# https://download.savannah.gnu.org/releases/freetype/
wget http://download.savannah.gnu.org/releases/freetype/freetype-2.10.1.tar.gz

tar zxvf freetype-2.10.1.tar.gz

cd freetype-2.10.1

./configure --prefix=/usr/local/freetype && make && make install

cd /tmp

# http://www.ijg.org/
wget http://www.ijg.org/files/jpegsrc.v9d.tar.gz

tar zxvf jpegsrc.v9.tar.gz

cd jpeg-9/

./configure --prefix=/usr/local/jpeg && make && make install

cd /tmp

# http://www.libpng.org/pub/png/libpng.html
wget https://download.sourceforge.net/libpng/libpng-1.6.37.tar.gz --no-check-certificate

tar zxvf libpng-1.6.37.tar.gz

cd libpng-1.6.37

./configure --prefix=/usr/local/libpng && make && make install

# 到 php 源码 dir
cd {php-source-dir}/ext/gd/

# 生成 configure 文件
{php-dir}/bin/phpize

# 查看可用参数
./configure --help

# 设置参数
./configure --with-php-config={php-dir}/bin/php-config --with-jpeg-dir=/usr/local/jpeg --with-png-dir=/usr/local/libpng --with-freetype-dir=/usr/local/freetype --enable-gd-native-ttf

make && make install

vim {php-dir}/lib/php.ini

# 最底下增加一行
extension=gd.so

service php-fpm reload

# 检查
php -r "var_dump(gd_info());"

$pic = imagecreate($maxWidth, $maxHeight);
//定义颜色
$black = imagecolorallocate($pic, 0, 0, 0);
$white = imagecolorallocate($pic, 255, 255, 255);

// 白底
imagefill($pic, 0, 0, $white);

// 打水印
imagettftext($pic, $fontSize, 30, $x, $y, $lightGrey, $fontFile, $mark);

imagejpeg($pic, $resultPath, 100);
imagedestroy($pic);

// https://php.golaravel.com/function.imagettfbbox.html
$bbox = imagettfbbox($fontSize, 0, $fontFile, $text);

$offset = $colWidth - $bbox[2] - 50;

imagettftext($pic, $fontSize, 0, $x + $offset, $y, $_color, $fontFile, $text);