PHP中正则表达式操作函数

 

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高级使用：

输出结果：

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preg_grep 只匹配，不替换。

 

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preg_match_all("/\<img.*src=\"https:\/\/mmbiz\.qpic\.cn\/mmbiz_.*\".*\>/iesU", $message, $match);
            foreach ($match[0] as $i => $item) {
                $img_url = preg_replace("/\<img.*src=\"(.*?)\".*\>/", "\\1", $item);
                $img_type = preg_replace("/\<img.*data-type=\"(.*)\".*\>/", "\\1", $item);
                if(!in_array($img_type, array('gif', 'png', 'jpg', 'jpeg'))) {
                    switch (true) {

                        case strstr($img_url, 'gif'):
                            $img_type = 'gif';
                            break;
                        case strstr($img_url, 'png'):
                            $img_type = 'png';
                            break;
                        case (strstr($img_url, 'jpg') || strstr($img_url, 'jpeg')):
                            $img_type = 'jpg';
                            break;
                        default:
                            $img_type = 'gif';
                    }
                }
                $img_filename = md5($item).'.'.$img_type;
                $img_file = download_image_url($img_url, $img_filename);
                $img_file = str_replace(TEMP_PATH,"{$_SERVER['REQUEST_SCHEME']}://{$_SERVER['HTTP_HOST']}/runtime/",$img_file);
                $message = str_replace($item, "<img src='{$img_file}' style='max-width:100%;'>", $message);
            }

            preg_match_all("/background-image:\s*url\(.*https:\/\/mmbiz\.qpic\.cn\/mmbiz_.*\)/isU", $message, $match1);
            foreach ($match1[0] as $item) {
                $img_url = htmlspecialchars_decode($item);
                $img_url = preg_replace("/background-image:\s*url\(\"(.*)\"\)/", "\\1", $img_url);
                $img_type = preg_replace("/background-image:\s*url\(\".*?wx_fmt=(.*)\"\)/", "\\1", $item);
                if(!in_array($img_type, array('gif', 'png', 'jpg', 'jpeg'))) {
                    switch (true) {

                        case strstr($img_url, 'gif'):
                            $img_type = 'gif';
                            break;
                        case strstr($img_url, 'png'):
                            $img_type = 'png';
                            break;
                        case (strstr($img_url, 'jpg') || strstr($img_url, 'jpeg')):
                            $img_type = 'jpg';
                            break;
                        default:
                            $img_type = 'gif';
                    }
                }
                $img_filename = md5($item).'.'.$img_type;
                $img_file = download_image_url($img_url, $img_filename);
                $img_file = str_replace(TEMP_PATH,"{$_SERVER['REQUEST_SCHEME']}://{$_SERVER['HTTP_HOST']}/runtime/",$img_file);
                $message = str_replace($item, "background-image: url('{$img_file}')", $message);
            }

            preg_match_all("/\<img.*src=\"https:\/\/qimg\.haodian\.cn\/.*\".*\>/iesU", $message, $match2);
            foreach ($match2[0] as $item) {
                $img_url = preg_replace("/\<img.*(src=\".*?\").*\>/", "\\1", $item);
                $new_item = str_replace($img_url,$img_url.' style="max-width:100%;" ',$item);
                $message = str_replace($item, $new_item, $message);
            }

            if ($match[0] || $match1[0] || $match2[0]){
                $ifupload = 1;
            }

            //var_dump($message);

            //$message = htmlspecialchars($message);

            $search_arr = array("\t","\n","\r");
            $replace_arr = array("","","");
            $message = str_replace($search_arr,$replace_arr,$message);