How to use PHP to convert PDF to images and splice images (code attached)

For how to use PHP to convert PDF to images, the most important thing is to install the ImageMagick extension on the server side. With the ImageMagick extension, you can use the following code to implement it.

* @param $pdf PDF file to be processed
* @param $path Image path to be saved
* @param int|Page to be exported$page Page to be exported-1 is All 0 means the first page and 1 means the second page
* @return Saved image path and file name Note: This is a pitfall. For the $pdf path and $path path in Imagick, the PHP version is 5. Use relative paths. The php7 version must use absolute paths. Therefore, it is recommended that everyone use absolute paths.
Note: This is a pit. For the $pdf path and $path path in Imagick, if the php version is 5, you can use relative paths. The php7 version must use absolute paths. Therefore, it is recommended that everyone use absolute paths.

For details on how to use PHP to convert PDF to images, please see the following specific example code:

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date Time: 2018/7/16 16:13
 * Author: Wanzhou Chen
 * Email: 295124540@qq.com
 */
 
namespace utils;
 
 
class Handler
{
    /**
     * PDF2PNG
     * @param $pdf  待处理的PDF文件
     * @param $path 待保存的图片路径
     * @param int|待导出的页面 $page 待导出的页面 -1为全部 0为第一页 1为第二页
     * @return 保存好的图片路径和文件名 注：此处为坑 对于Imagick中的$pdf路径 和$path路径来说，   php版本为5+ 可以使用相对路径。php7+版本必须使用绝对路径。所以，建议大伙使用绝对路径。
     * 注：此处为坑 对于Imagick中的$pdf路径 和$path路径来说，   php版本为5+ 可以使用相对路径。php7+版本必须使用绝对路径。所以，建议大伙使用绝对路径。
     */
    static function pdfToPng($pdf,$path,$page=-1)
    {
        if(!extension_loaded(&#39;imagick&#39;))
        {
            return 1;
        }
        if(!file_exists($pdf))
        {
            return 2;
        }
        if(!is_readable($pdf))
        {
            return 3;
        }
        $im = new \Imagick();
        $im->setResolution(150,150);
        $im->setCompressionQuality(100);
        if($page==-1){
            $im->readImage($pdf);
        } else{
            $im->readImage($pdf."[".$page."]");
        }
 
        foreach ($im as $Key => $Var)
        {
            $Var->setImageFormat(&#39;png&#39;);
            $filename = $path. md5($Key.time()).&#39;.png&#39;;
            if($Var->writeImage($filename) == true)
            {
                $Return[] = $filename;
            }
        }
        //返回转化图片数组，由于pdf可能多页，此处返回二维数组。
        return $Return;
    }
 
 
    /**
     * spliceimg
     * @param array $imgs pdf转化png  路径
     * @param string $img_path
     * @return string 将多个图片拼接为成图的路径
     * 注：多页的pdf转化为图片后拼接方法
     * @internal param string $path 待保存的图片路径
     */
    static function spliceImg($imgs = array(),$img_path = &#39;&#39;)
    {
 
        $width = 500; //自定义宽度
        $height = null;
        $pic_tall = 0;//获取总高度
        foreach ($imgs as $key => $value) {
            $arr = getimagesize($value);
            $height = $width/$arr[0]*$arr[1];
            $pic_tall += $height;
        }
        $pic_tall = intval($pic_tall);
        // 创建长图
        $targetImg = imagecreatetruecolor($width,$pic_tall);
        //分配一个白色底色
        $color = imagecolorAllocate($targetImg,255,255,255);
        imagefill($targetImg,0,0,$color);
 
        $tmp  = 0;
        $tmpy = 0; //图片之间的间距
        $src = null;
        $size = null;
        foreach ($imgs as $k => $v) {
            $src = Imagecreatefrompng($v);
            $size = getimagesize($v);
            //5.进行缩放
            imagecopyresampled($targetImg,$src, $tmp, $tmpy,0,0,$width,$height,$size[0],$size[1]);
            //imagecopy($targetImg, $src, $tmp, $tmpy, 0, 0, $size[0],$size[1]);
            $tmpy = $tmpy + $height;
            //释放资源内存
            imagedestroy($src);
            unlink($imgs[$k]);
        }
        $returnfile = $img_path.date(&#39;Y-m-d&#39;);
        if (!file_exists($returnfile))
        {
            if (!self::makeDir($returnfile))
            {
                /* 创建目录失败 */
                return false;
            }
        }
        $return_imgpath = $returnfile.&#39;/&#39;.md5(time().$pic_tall.&#39;pdftopng&#39;).&#39;.png&#39;;
        imagepng($targetImg,$return_imgpath);
        return $return_imgpath;
 
    }
 
 
    /**
     * makeDir
     * @param string $folder 生成目录地址
     * 注：生成目录方法
     * @return bool
     */
    static function makeDir($folder)
    {
        $reval = false;
        if (!file_exists($folder))
        {
            /* 如果目录不存在则尝试创建该目录 */
            @umask(0);
            /* 将目录路径拆分成数组 */
            preg_match_all(&#39;/([^\/]*)\/?/i&#39;, $folder, $atmp);
            /* 如果第一个字符为/则当作物理路径处理 */
            $base = ($atmp[0][0] == &#39;/&#39;) ? &#39;/&#39; : &#39;&#39;;
            /* 遍历包含路径信息的数组 */
            foreach ($atmp[1] AS $val)
            {
                if (&#39;&#39; != $val)
                {
                    $base .= $val;
                    if (&#39;..&#39; == $val || &#39;.&#39; == $val)
                    {
                        /* 如果目录为.或者..则直接补/继续下一个循环 */
                        $base .= &#39;/&#39;;
                        continue;
                    }
                }
                else
                {
                    continue;
                }
                $base .= &#39;/&#39;;
                if (!file_exists($base))
                {
                    /* 尝试创建目录，如果创建失败则继续循环 */
                    if (@mkdir(rtrim($base, &#39;/&#39;), 0777))
                    {
                        @chmod($base, 0777);
                        $reval = true;
                    }
                }
            }
        }
        else
        {
            /* 路径已经存在。返回该路径是不是一个目录 */
            $reval = is_dir($folder);
        }
        clearstatcache();
        return $reval;
    }
}

Call the statement to convert PDF to png and splice the images: Convert pdf to png and splice pictures (compatible with ios preview cannot display signature issue)

  // 把pdf转成png，并拼接图片（兼容ios预览无法显示签章问题）
        $imgArr = Handler::pdfToPng($path,$_SERVER['DOCUMENT_ROOT'].'/file/');
        $img = '';
        if($imgArr&&is_array($imgArr)){
            $img = Handler::spliceImg($imgArr,$_SERVER['DOCUMENT_ROOT'].'/file/agreement/');
        }

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