闲来无事就做个图片抓取。
把某网站的图片抓取后，保存在本地指定目录，同时生成写入数据库的sql语句。

思路如下：

1. 获取页面图的url
2. 根据图片url下载到本地
3. 把下载好的图片存储到指定目录，同时生成写入数据库的sql

完整代码如下：

<?php


class RetileImg
{

    protected $url;   //请求地址

    protected $url_status = false; // false是http请求 true是https请求

    protected $img_path;  //图片存储地址

    protected $sql_path;  //sql语句保存地址

    protected $domain_name; //域名  如果有图片是相对路径就需要填写域名

    public function __construct($url, $url_status, $img_path, $sql_path, $domain_name)
    {
        $this->url = $url;
        $this->url_status = $url_status;
        $this->img_path = $img_path . "/" . date("Ymd") . "/";
        $this->sql_path = $sql_path . "/";
        $this->domain_name = $domain_name;
    }

    /**获取页面
     * @return bool|string
     */
    public function curl_web()
    {
        $url = $this->url;
        $url_status = $this->url_status;
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 100);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 100);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, $url_status);
        $ch_content = curl_exec($ch);
        return $ch_content;
    }

    /**匹配页面的图片路径
     * @param $content
     * @return mixed|null
     */
    public function get_img_from_html($content)
    {
        $pattern = "/<img.*?src=[\'|\"](.*?)[\'|\"].*?[\/]?>/";
        $html_data = htmlspecialchars_decode($content);
        preg_match_all($pattern, $html_data, $match);
        if (!empty($match[1])) {
            return $match[1];
        }
        return null;
    }

    /**获取页面的所有图片路径
     * @return mixed|null
     */
    public function get_img_urls()
    {
        $url = $this->url;
        $html_data = $this->curl_web($url);
        $img_urls = $this->get_img_from_html($html_data) ?? null;
        $domain_name = $this->domain_name;
        $urls = [];
        foreach ($img_urls as $k => $v) {
            if (empty($v)) {
                unset($k[$v]);
            }
            $http_top = mb_substr($v, 0, 4);
            if ($http_top != 'http' && !empty($domain_name)) {
                $v = $domain_name . $v;
            };
            $urls[] = $v;
        }
        return $urls;
    }

    /**下载图片到本地
     * @throws Exception
     */
    public function download()
    {
        $img_urls = $this->get_img_urls();
        $img_path = $this->img_path;
        $sql_path = $this->sql_path;
        $mimes = array(
            'bmp',
            'gif',
            'jpg',
            'png',
        );

        $sql = "insert into img_data ('img_name','img_url','img_description','add_time') value (";
        foreach ($img_urls as $k => $v) {
            $ext = mb_substr($v, -3);
            // 如果符合我们要的类型
            if (in_array($ext, $mimes)) {
                $number = random_int(10, 99999);
                $img_name = date("YmdHis") . $number;
                $content = file_get_contents($v);
                if (!is_dir($img_path)) {
                    mkdir($img_path, 0777, true);
                }
                //echo "图片下载" . $content . PHP_EOL;
                $file_name = md5($img_name);
                $file_path = $img_path . $file_name . "." . $ext;
                file_put_contents($file_path, $content);
                $sql .= "'" . $file_name . "',";
                $sql .= "'" . $file_path . "',";
                $sql .= "'" . $file_name . "',";
                $sql .= date("Y-m-d H:i:s");
            }
        }
        $sql .= ");";
        if (!is_dir($sql_path)) {
            mkdir($sql_path, 0777, true);
        }
        file_put_contents($sql_path . "sql.txt", $sql);
    }
}


//执行图片获取
header("Content-type: text/html; charset=utf-8");
$img_data = new RetileImg(
    "https://erik.xyz/2014/10/17/zhe-shi-yi-ge-kai-shi-de-jie-shu/",
    true,
    "./img",
    "./sql",
    "https://erik.xyz"
);
$img_data->download();

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