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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;

    }

}
05-11 15:05
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