PHP web page capture

header('Content-Type:text/html;charset=utf-8');

/**
 * A class for grabbing pictures
*/
class download_image {
 public $_save_path = NULL; //The way to save pictures
 public $_limit_size = NULL; //Limit the size of pictures
 public static $_img_url_old = array(); //Storage the captured image link address
 public static $_a_page_url = array(); / /Storage the crawled page
 public function __construct( $_save_path, $_limit_size) {
 $this->_save_path = $_save_path;
 $this->_limit_size = $_limit_size;
 }

 public function get_all_page_image( $ site_url ) {
 if ( $site_url == '' ) {
 return false;
 }
 if ( ! in_array( $site_url, self::$_a_page_url ) ) { //Determine whether the current page has been crawled
 self:: $_a_page_url[] = $site_url; //Save the hyperlink into a static array
 } else {
 return; //If it has been crawled, jump out
 }
 $this->download_the_page_image( $site_url );
 $content = @file_get_contents($site_url);
 $a_page_url = "|]+href=['\" ]?([^ '\"?]+)['\" >]|U ";
 $all_url = array();
 preg_match_all( $a_page_url, $content, $all_url, PREG_SET_ORDER );
 if ( $all_url != NULL ) {
 foreach( $all_url as $key => $val ) {
 /**
 * Static hyperlinks to prevent entering an infinite loop
 * Exit the current page link representation ('', '#', '/')
*/
 if ( trim($val[1]) != '' && ! in_array( $val[1], self::$_a_page_url ) && ! in_array( $val[1], array('#','/',$site_url) ) ) {
 self::$_a_page_url[] = $val[1]; //Write the hyperlinks that meet the requirements into the static array
 }
 }
 }
 if ( self::$_a_page_url != NULL ) {
 foreach( self::$_a_page_url as $keys => $vals ) {
 if ( strpos( $vals, 'http://' ) === false ) { //When the hyperlink does not contain http://, it cannot be accessed directly
 // When the image link address is a relative address, the address is reassembled
 $a_domain_url = substr( $site_url, 0, strpos( $site_url, '/' ,8 ) + 1 );
 $a_img_url = $a_domain_url.$vals;
 }
 //Recursive call, access each hyperlink page
 $this->get_all_page_image( $a_img_url );
 }
 }
 }

 /**
 * Download all image links under the current page
 * @param $site_url
*/
 public function download_the_page_image( $site_url ) {
 // Get all the contents of the current link address page
 $img_pattern = NULL;
 $content = @file_get_contents( $site_url );
 $img_pattern = "|]+src=['\" ]?([^ '\"?]+)['\" >]|U";
 //Globally match all Picture link in
 $img_out = array();
 preg_match_all( $img_pattern, $content, $img_out, PREG_SET_ORDER );
 echo ''. $site_url . 'Total found' . count($img_out ) . 'Picture';
 //print_r($img_out[1]);
 foreach( $img_out as $key => $val ) {
 //echo htmlspecialchars($val[1] ).'';
 $this->save_one_image( $site_url, $val[1]);
 }

 }

 public function save_one_image( $site_url, $img_url ) {
 if ( strpos( $img_url, 'http://' ) === false ) {
 // When the image link address is a relative address, the address is reassembled
 $domain_url = substr( $site_url, 0, strpos( $site_url, '/ ',8 ) + 1 );
 $img_url = $domain_url.$img_url;
 }
 $pic_name = basename( $img_url ); //Get the picture name

 if ( in_array( $img_url, self::$_img_url_old ) ) {
 echo $img_url .'This image has been captured!';
 return;
 }
 //Get the image content and write it into a string
 $img_data = @file_get_contents( $img_url );
 if ( strlen($img_data) < $this->_limit_size ) { //The image size is within the limit range Inside
 $img_boo = @file_put_contents( $this->_save_path.md5(microtime()).$pic_name, $img_data );
 if ( $img_boo ) {
 echo $img_url .'The picture was saved successfully!';
 self::$_img_url_old[] = $img_url;
 } else {
 echo $img_url .'Picture saving failed! ';
 }
 } else {
 echo $img_url .'The image size is within the limit outside! ';
 }
 }
}
set_time_limit(0);
$download_images = new download_image('surces_Img/',1024*1024*100);
$download_images-> get_all_page_image('http://www.baidu.com/');
?>

Snapshot, PHP