PHP中GD库的使用

1.基本步骤

<?php
/**
 * Created by PhpStorm.
 * User: jiqing
 * Date: 18-4-9
 * Time: 上午9:34
 * 熟悉步骤
 */

// 1.创建画布
$width = 500;
$height= 300;
$image=imagecreatetruecolor($width,$height);

// 2.创建颜色
$red=imagecolorallocate($image,255,0,0);
$blue=imagecolorallocate($image,0,0,255);

// 3.进行绘画
// 水平绘制字符
imagechar($image,5,50,100,'K',$red);
// 垂直绘制字符
imagecharup($image,4,100,100,'J',$blue);

// 水平绘制字符串
imagestring($image,4,200,100,"Hello",$blue);

// 4.输出或保存
header('content-type:image/jpeg');
imagejpeg($image);

//if(imagejpeg($image,'./1.jpg')) {
//    echo '保存成功';
//} else {
//    echo '保存失败';
//}

// 5.销毁画布
imagedestroy($image);

2.优化字体和画布

<?php
/**
 * Created by PhpStorm.
 * User: jiqing
 * Date: 18-4-9
 * Time: 上午9:51
 * 解决画布黑底，字体太丑问题
 */

// 创建画布
$image=imagecreatetruecolor(500,500);

// 创建颜色
$white=imagecolorallocate($image,255,255,255);
$randColor=imagecolorallocate($image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));

// 绘制填充矩形
imagefilledrectangle($image,0,0,500,500,$white);

// 采用自定义字体绘画
imagettftext($image,18,0,100,100,$randColor,'../ttf/Rekha.ttf',"Hello world!");
imagettftext($image,22,30,100,200,$randColor,'../ttf/msyh.ttf',"Hello world!");

// 展示
header('content-type:image/jpeg');
imagejpeg($image);

// 销毁
imagedestroy($image);

3.创建简单的验证码

<?php
/**
 * Created by PhpStorm.
 * User: jiqing
 * Date: 18-4-9
 * Time: 上午10:38
 * 实现验证码功能
 */
// 创建画布
$width=140;
$height=50;
$image=imagecreatetruecolor($width,$height);

// 创建颜色
$white=imagecolorallocate($image,255,255,255);
$randColor=imagecolorallocate($image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));

// 绘制填充矩形
imagefilledrectangle($image,0,0,$width,$height,$white);

// 开始绘制
$size=mt_rand(20,28);
$angle=mt_rand(-10,10);
$x=30;
$y=35;
$fontfile="../ttf/msyh.ttf";
$string=mt_rand(1000,9999);

imagettftext($image,$size,$angle,$x,$y,$randColor,$fontfile,$string);

// 展示
header('content-type:image/jpeg');
imagejpeg($image);

// 销毁
imagedestroy($image);

4.创建复杂的验证码

<?php
/**
 * Created by PhpStorm.
 * User: jiqing
 * Date: 18-4-9
 * Time: 上午10:49
 */

// 随机颜色
function getRandColor($image) {
    return imagecolorallocate($image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
}

// 创建画布
$width=140;
$height=50;
$image=imagecreatetruecolor($width,$height);

// 创建颜色
$white=imagecolorallocate($image,255,255,255);

// 绘制填充矩形
imagefilledrectangle($image,0,0,$width,$height,$white);

// 开始绘制
$string = join('',array_merge(range(0,9),range('a','z'),range('A','Z')));

$length=4;
for($i=0;$i<$length;$i++) {
    $size=mt_rand(20,28);

    $textWidth = imagefontwidth($size);
    $textHeight= imagefontheight($size);

    $angle=mt_rand(-10,10);
//    $x=20+30*$i;
//    $y=35;
    $x=($width/$length)*$i+$textWidth;
    $y=mt_rand($height/2,$height-$textHeight);

    $fontfile="../ttf/msyh.ttf";
    $text = str_shuffle($string)[0];// 打乱之后取其一
    imagettftext($image,$size,$angle,$x,$y,getRandColor($image),$fontfile,$text);
}

// 添加干扰元素
for($i=1;$i<=50;$i++) {
    imagesetpixel($image,mt_rand(0,$width),mt_rand(0,$height),getRandColor($image));
}

// 绘制线段
for ($i=1;$i<=3;$i++) {
    imageline($image,mt_rand(0,$width),mt_rand(0,$height),mt_rand(0,$height),mt_rand(0,$width),getRandColor($image));
}

// 展示
header('content-type:image/jpeg');
imagejpeg($image);

// 销毁
imagedestroy($image);

5.封装验证码成函数

<?php
/**
 * Created by PhpStorm.
 * User: jiqing
 * Date: 18-4-9
 * Time: 上午11:23
 * 封装验证码成函数
 */
function getVerify($type,$length) {
    // 随机颜色
    function getRandColor($image) {
        return imagecolorallocate($image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
    }

    // 创建画布
    $width=20+$length*40;
    $height=50;
    $image=imagecreatetruecolor($width,$height);

    // 创建颜色
    $white=imagecolorallocate($image,255,255,255);

    // 绘制填充矩形
    imagefilledrectangle($image,0,0,$width,$height,$white);

    /**
     * 默认是4
     * 1-数字
     * 2-字母
     * 3-数字+字母
     * 4-汉字
     */
    $type=$type?$type:1;
    $length=$length?$length:4;
    switch ($type) {
        case 1:
            // 数字
            $string = join('',array_rand(range(0,9),$length));
            break;
        case 2:
            // 字母
            $string = join('',array_rand(array_flip(array_merge(range('a','z'),range('A','Z'))),$length));

            break;
        case 3:
            // 数字+字母
            $string = join('',array_rand(array_flip(array_merge(range(0,9),range('a','z'),range('A','Z'))),$length));

            break;
        case 4:
            // 汉字
            $str="汤,科,技,积,极,拓,展,人,工,智,能,领,域,尤,其,在,深,度,学,习,和,视,觉,计,算,方,面,其,科,研,能,力,让,人,印,象,深,刻,阿,里,巴,巴,在,人,工,智,能,领,域,的,投,入,已,为,旗,下,业,务,带,来,显,著,效,益,今,后,我,们,将,继,续,在,人,工,智,能,领,域,作,出,投,资,我,们,期,待,与,商,汤,科,技,的,战,略,合,作,能,够,激,发,更,多,创,新,为,社,会,创,造,价,值";
            $arr=explode(",",$str);
            $string = join('',array_rand(array_flip($arr),$length));
            break;
        default:
            exit('非法参数');
            break;
    }

    for($i=0;$i<$length;$i++) {
        $size=mt_rand(20,28);

        $textWidth = imagefontwidth($size);
        $textHeight= imagefontheight($size);

        $angle=mt_rand(-10,10);

        $x=($width/$length)*$i+$textWidth;
        $y=mt_rand($height/2,$height-$textHeight);

        $fontfile="../../ttf/msyh.ttf";
        $text = mb_substr($string,$i,1,'UTF-8');
        imagettftext($image,$size,$angle,$x,$y,getRandColor($image),$fontfile,$text);
    }

    // 添加干扰元素
    for($i=1;$i<=50;$i++) {
        imagesetpixel($image,mt_rand(0,$width),mt_rand(0,$height),getRandColor($image));
    }

    // 绘制线段
    for ($i=1;$i<=3;$i++) {
        imageline($image,mt_rand(0,$width),mt_rand(0,$height),mt_rand(0,$height),mt_rand(0,$width),getRandColor($image));
    }

    // 展示
    header('content-type:image/jpeg');
    imagejpeg($image);

    // 销毁
    imagedestroy($image);
}

getVerify(3,6);

6.缩略图

<?php
/**
 * Created by PhpStorm.
 * User: jiqing
 * Date: 18-4-9
 * Time: 上午11:22
 * 图片处理
 */

$filename = "../images/iphone7.jpg";
$fileInfo = getimagesize($filename);
list($src_width,$src_height) = $fileInfo;

// 缩放
$dst_w = 100;
$dst_h = 100;
// 创建目标画布资源
$dst_image=imagecreatetruecolor($dst_w,$dst_h);
// 通过图片文件创建画布资源
$src_image=imagecreatefromjpeg($filename);
imagecopyresampled($dst_image,$src_image,0,0,0,0,$dst_w,$dst_h,$src_width,$src_height);

imagejpeg($dst_image,'thumbs/thumb_100x100.jpg');

// 展示
header('content-type:image/jpeg');
imagejpeg($dst_image);

imagedestroy($dst_image);

7.等比例缩放

<?php
/**
 * Created by PhpStorm.
 * User: jiqing
 * Date: 18-4-9
 * Time: 上午11:22
 * 图片处理
 */

$filename = "../images/longmen.jpg";
if($fileInfo = getimagesize($filename)) {
    list($src_w,$src_h) = $fileInfo;
} else {
    exit('文件不是真实图片');
}

// 等比例缩放
// 设置最大宽和高
$dst_w = 300;
$dst_h = 600;

$ratio_orig = $src_w / $src_h;
if ($dst_w / $dst_h > $ratio_orig) {
    $dst_w = $dst_h * $ratio_orig;
} else {
    $dst_h = $dst_w / $ratio_orig;
}

// 创建目标画布资源
$dst_image=imagecreatetruecolor($dst_w,$dst_h);
// 通过图片文件创建画布资源
$src_image=imagecreatefromjpeg($filename);
imagecopyresampled($dst_image,$src_image,0,0,0,0,$dst_w,$dst_h,$src_w,$src_h);

imagejpeg($dst_image,'../thumbs/thumb_same.jpg');

// 展示
header('content-type:image/jpeg');
imagejpeg($dst_image);

imagedestroy($dst_image);
imagedestroy($src_image);

优化处理

<?php
/**
 * Created by PhpStorm.
 * User: jiqing
 * Date: 18-4-9
 * Time: 上午11:22
 * 图片处理
 */

$filename = "../images/longmen.jpg";
if($fileInfo = getimagesize($filename)) {
    list($src_w,$src_h) = $fileInfo;
    $mime = $fileInfo['mime'];
} else {
    exit('文件不是真实图片');
}

// image/jpeg image/gif image/png
$createFun = str_replace('/','createfrom',$mime);
$outFun = str_replace('/','',$mime);

// 等比例缩放
// 设置最大宽和高
$dst_w = 300;
$dst_h = 600;

$ratio_orig = $src_w / $src_h;
if ($dst_w / $dst_h > $ratio_orig) {
    $dst_w = $dst_h * $ratio_orig;
} else {
    $dst_h = $dst_w / $ratio_orig;
}

// 创建目标画布资源
$dst_image=imagecreatetruecolor($dst_w,$dst_h);
// 通过图片文件创建画布资源
// $src_image=imagecreatefromjpeg($filename);
$src_image=$createFun($filename);

imagecopyresampled($dst_image,$src_image,0,0,0,0,$dst_w,$dst_h,$src_w,$src_h);

// imagejpeg($dst_image,'../thumbs/thumb_same.jpg');
$outFun($dst_image,'../thumbs/thumb_same.jpg');

// 展示
header('content-type:image/jpeg');
//imagejpeg($dst_image);
$outFun($dst_image);

imagedestroy($dst_image);
imagedestroy($src_image);

8.文字水印

<?php
/**
 * Created by PhpStorm.
 * User: jiqing
 * Date: 18-4-10
 * Time: 上午10:56
 * 加水印
 */

$filename = "../images/longmen.jpg";
$fileInfo = getimagesize($filename);
$mime = $fileInfo['mime'];

$createFun = str_replace('/','createfrom',$mime);
$outFun = str_replace('/',null,$mime);

$image = $createFun($filename);
//$red = imagecolorallocate($image,255,0,0);
$red = imagecolorallocatealpha($image,255,0,0,50); // 实现透明

$fontfile = "../ttf/msyh.ttf";
imagettftext($image,30,0,30,50,$red,$fontfile,"China你好");
header('content-type:'.$mime);
$outFun($image);
imagedestroy($image);

GD库综合使用

<?php
/**
 * Created by PhpStorm.
 * User: jiqing
 * Date: 18-4-8
 * Time: 上午11:58
 */

class SiemensAction extends CommonAction{
    public function _initialize()
    {
        parent::_initialize();
        header( "Access-Control-Allow-Origin:*" );
    }

    public function index(){
        $url = $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
        if ($url == 'hotel.caomall.net/index.php/Siemens'){
            header('Location:http://hotel.caomall.net/index.php/Siemens/');
            return false;
        }

        $this->assign('$random_num',rand(1111,9999));
        $this->display();
    }

    public function get_compose_pic() {
        vendor('Func.Json');
        $json = new Json();

        file_put_contents("./log/jiqing_log.txt", "\n".json_encode($_POST), FILE_APPEND);

        $logData = [];
        $logData = $_POST;

        // 创建画布
        $bg_w = $_POST['bgWidth'];
        $bg_h = $_POST['bgHeight'];

        $dpi = $_POST['dpi'];
        if ($dpi == 1) {
            $bg_w *= 3;
            $bg_h *= 3;
        }

        if ($dpi == 1.5) {
            $bg_w *= 2;
            $bg_h *= 2;
        }

        if ($dpi == 2) {
            $bg_w *= 1.5;
            $bg_h *= 1.5;
        }

        $img_w = $_POST['imgWidth'];
        $img_h = $_POST['imgHeight'];

        $percentRate = ($bg_w/1125);

        $img_h = $img_h * (bcdiv($bg_w,$img_w,2));
        $img_w = $bg_w;

        if ($img_h > $bg_h) {
            $true_h = $bg_h;
            $true_h = $true_h - 30; // 防止太高
            $true_w = $img_w;
        } else {
            $true_h = $img_h;
            $true_w = $img_w;
        }

        $logData['true_h'] = $true_h;
        $logData['true_w'] = $true_w;

        $canvas_w = $true_w + 72;
        $canvas_h = $true_h + 212;
        $canvasImage = imagecreatetruecolor($canvas_w,$canvas_h);

        // 创建颜色
        $white=imagecolorallocate($canvasImage,255,255,255);
        $green = imagecolorallocatealpha($canvasImage,103,159,27,20); // 实现透明

        // 绘制填充矩形
        imagefilledrectangle($canvasImage,0,0,$canvas_w,$canvas_h,$white);

        // 添加固定文字
        $fontsize1 = 44*$percentRate;
        $text1 = "世界地球日 环保有创意";

        $fontsize2 = 24*$percentRate;
        $text2 = "长 按 二 维 码 定 制 你 的 环 保 创 意 海 报";

        imagettftext($canvasImage,$fontsize1,0,36,$true_h + 36 + 80 ,$green,'/siemens/font/msyh.ttf',$text1);
        imagettftext($canvasImage,$fontsize2,0,36,$true_h + 36 + 130 ,$green,'/siemens/font/msyh.ttf',$text2);

        \PHPQRCode\QRcode::png("http://".$_SERVER['HTTP_HOST']."/index.php/Siemens/index", "./tmp/qrcode.png", 'L', 4, 2);
        // 添加二维码
        $qr_url = "http://".$_SERVER['SERVER_NAME']."/tmp/qrcode.png";
        $qrImageZoomInfo = $this->_imageZoom($qr_url,true,150,150);
        imagecopymerge($canvasImage,$qrImageZoomInfo['image'],$canvas_w - 186,$canvas_h - 170,0,0,$qrImageZoomInfo['width'],$qrImageZoomInfo['height'],80);

        // 获取基础图片
        $bgId = $_POST['bgId'];
        $baseImageInfo = $this->_getBasePic($bgId);

        // 固定缩放处理
        $baseImage = $this->_imageZoomFixed($baseImageInfo['imgUrl'],true,$img_w,$img_h);
        $baseImage = $baseImage['image'];

        // 图片裁剪处理
        $baseImage = $this->_imageCut($baseImage,$true_w,$true_h);

        // 添加logo
        $plugins = json_decode($_POST['plugins'],true)[0];
        if ($plugins) {
            // 有贴图
            if ($plugins['type'] == 1) { // 贴图

                $chartlet_w = $plugins['width'];
                $chartlet_h = $plugins['height'];
                $chartlet_top = $plugins['top'];
                $chartlet_left= $plugins['left'];

                if ($dpi == 1.5) {
                    $chartlet_w *= 2;
                    $chartlet_h *= 2;
                    $chartlet_top *= 2;
                    $chartlet_left *= 2;
                }

                if ($dpi == 2) {
                    $chartlet_w *= 1.5;
                    $chartlet_h *= 1.5;
                    $chartlet_top *= 1.5;
                    $chartlet_left *= 1.5;
                }

                if ($dpi == 1) {
                    $chartlet_w *= 3;
                    $chartlet_h *= 3;
                    $chartlet_top *= 3;
                    $chartlet_left *= 3;
                }

                $chartlet_url = "http://".$_SERVER['SERVER_NAME'].$plugins['src'];
                $chartletImageZoomInfo = $this->_imageZoomFixed($chartlet_url,true,$chartlet_w,$chartlet_h);
                imagecopymerge($baseImage,$chartletImageZoomInfo['image'],$chartlet_left,$chartlet_top,0,0,$chartlet_w,$chartlet_h,100);

            } else { // 文字
                $text_w = $plugins['width'];
                $text_h = $plugins['height'];
                $text_top = $plugins['top'];
                $text_left= $plugins['left'];

                if ($dpi == 1.5) {
                    $text_w *= 2;
                    $text_h *= 2;
                    $text_top *= 2;
                    $text_left *= 2;
                }

                if ($dpi == 2) {
                    $text_w *= 1.5;
                    $text_h *= 1.5;
                    $text_top *= 1.5;
                    $text_left *= 1.5;
                }

                if ($dpi == 1) {
                    $text_w *= 3;
                    $text_h *= 3;
                    $text_top *= 3;
                    $text_left *= 3;
                }

                $customText = $plugins['val'];

                $customText = $this->_str_line($customText);
                imagettftext($baseImage,44,0,$text_left,$text_top,$white,'/siemens/font/msyh.ttf',$customText);
            }
        }

        // 增加logo
        $logo_url = "http://".$_SERVER['SERVER_NAME']."/siemens/img/logo.png";
        $logoImageInfo = $this->_imageZoom($logo_url,true,300);
        imagecopymerge($baseImage,$logoImageInfo['image'],30,30,0,0,$logoImageInfo['width'],$logoImageInfo['height'],80);

        // 合成到主画布
        imagecopymerge($canvasImage,$baseImage,36,36,0,0,$true_w,$true_h,100);

        $outImgPath = '/tmp/'.date('YmdHis').rand(1000,9999).'.jpg';
        $flag = imagejpeg($canvasImage,".".$outImgPath);

        // 日志
        $logData['outImgPath'] = $outImgPath;
        file_put_contents("./log/jiqing_log.txt", "\n".json_encode($logData), FILE_APPEND);

        if($flag){
            $json->setAttr('imgurl',$outImgPath);
            $json->setErr(0,'图片合成成功');
            $json->Send();
        }else{
            $json->setErr(10001,'图片合成失败');
            $json->Send();
        }
    }

    private function _str_line($str,$len = 10) {
        function mb_str_split($str){
            return preg_split('/(?<!^)(?!$)/u', $str );
        }

        $str_arr = mb_str_split($str);

        $i = 0;
        $new_str = "";

        foreach($str_arr as $val) {
            $new_str .= $val;

            $i ++ ;

            if ($i % 10 == 0) {
                $new_str .= "\r\n";
            }

        }

        return $new_str;
    }

    // 图片裁剪
    private function _imageCut($source,$width,$height,$source_x = 0,$source_y = 0) {
        // 创建画布
        $copyimage=imagecreatetruecolor($width,$height);

        // 创建颜色
        $white=imagecolorallocate($copyimage,255,255,255);

        imagefilledrectangle($copyimage,0,0,$width,$height,$white);

        imagecopyresampled($copyimage,$source,0,0,$source_x,$source_y,$width,$height,$width,$height);

        return $copyimage;
    }

    // 图片等比例缩放,背景透明处理
    private function _imageZoom($filename,$is_transparent = true,$dst_w="200",$dst_h="200") {
        if($fileInfo = getimagesize($filename)) {
            list($src_w,$src_h) = $fileInfo;
            $mime = $fileInfo['mime'];
        } else {
            exit('文件不是真实图片');
        }

        // image/jpeg image/gif image/png
        $createFun = str_replace('/','createfrom',$mime);
        $outFun = str_replace('/','',$mime);

        // 等比例缩放
        $ratio_orig = $src_w / $src_h;
        if ($dst_w / $dst_h > $ratio_orig) {
            $dst_w = $dst_h * $ratio_orig;
        } else {
            $dst_h = $dst_w / $ratio_orig;
        }

        // 创建目标画布资源
        $dst_image=imagecreatetruecolor($dst_w,$dst_h);
        // 透明处理
        if ($is_transparent) {
            $color=imagecolorallocate($dst_image,204,204,204);
            imagecolortransparent($dst_image,$color);
            imagefill($dst_image,0,0,$color);
        }

        // 通过图片文件创建画布资源
        $src_image=$createFun($filename);

        imagecopyresampled($dst_image,$src_image,0,0,0,0,$dst_w,$dst_h,$src_w,$src_h);

        $fileInfo['width'] = $dst_w;
        $fileInfo['height'] = $dst_h;
        $fileInfo['image'] = $dst_image;

        imagedestroy($src_image);
//        imagedestroy($dst_image);
        return $fileInfo;
    }

    private function _imageZoomFixed($filename,$is_transparent = true,$dst_w="200",$dst_h="200") {
        if($fileInfo = getimagesize($filename)) {
            list($src_w,$src_h) = $fileInfo;
            $mime = $fileInfo['mime'];
        } else {
            exit('文件不是真实图片');
        }

        // image/jpeg image/gif image/png
        $createFun = str_replace('/','createfrom',$mime);
        $outFun = str_replace('/','',$mime);

        // 创建目标画布资源
        $dst_image=imagecreatetruecolor($dst_w,$dst_h);
        // 透明处理
        if ($is_transparent) {
            $color=imagecolorallocate($dst_image,153,153,153);
            imagecolortransparent($dst_image,$color);
            imagefill($dst_image,0,0,$color);
        }

        // 通过图片文件创建画布资源
        $src_image=$createFun($filename);

        imagecopyresampled($dst_image,$src_image,0,0,0,0,$dst_w,$dst_h,$src_w,$src_h);

        $fileInfo['width'] = $dst_w;
        $fileInfo['height'] = $dst_h;
        $fileInfo['image'] = $dst_image;

        imagedestroy($src_image);
//        imagedestroy($dst_image);
        return $fileInfo;
    }

    // 获取基础图片信息
    private function _getBasePic($media_id) {
        // 获取accessToken
        $access_token_url = C('WECHAT_PROXY_HOST') . 'AccessToken/get';
        $access_res = Http::doGet($access_token_url);
        $json = json_decode($access_res, true);
        $accessToken = $json['data']['access_token'];

        $url = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=".$accessToken."&media_id=".$media_id;

        return $this->_getImageInfo($url);
    }

    // 获取图片信息
    private function _getImageInfo($filename) {
        if (@!$info = getimagesize($filename)) {
            exit('文件不是真实图片');
        }
        $fileInfo['width'] = $info[0];
        $fileInfo['height']= $info[1];
        $mime = image_type_to_mime_type($info[2]);
        $createFun = str_replace('/','createfrom',$mime);
        $outFun = str_replace('/','',$mime);
        $fileInfo['createFun'] = $createFun;
        $fileInfo['outFun'] = $outFun;
        $fileInfo['ext'] = strtolower(image_type_to_extension($info[2]));
        $fileInfo['imgUrl'] = $filename;
        return $fileInfo;
    }

}