PHP image collection program--image collection class

The code comes from my blog: http://www.taoniwu.com/archives/3234.html If you have any good suggestions, thank you~~~~~

?class Collection{
 protected $url; //Collection address
 protected $prefix; //Rename file prefix
 protected $style; //Pass in an array for the image format to be collected
 const prel = '/(?:http?|https?)://(?:[^./()?]+).(?:[^./]+).(?:com|cn| net|org)/(?:[^.:"'()?]+).(jpg|png|gif)/i'; //Collection rules
 //Constructor function
 function __construct($url,$prefix ,$style){
 switch($this->checkdata($url,$prefix,$style)){
 case 1:
 echo '<script>alert("The collection address cannot be empty!")< /script>';</li>
<li> exit;</li>
<li> break;</li>
<li> case 2:</li>
<li> echo '<script>alert("The image format to be collected should be an array!")</script>';
 exit;
 break;
 case 3:
 echo '<script>alert("The image format that needs to be collected cannot be empty!")</script>';
 exit;
 break;
 case 4:
 echo '<script> alert("The file name cannot contain . / | or start with a space!")</script>';
 exit;
 }
 $this->url = $url;
 $this->prefix = $prefix ;
 $this->style = $style;
 }
 //Start collecting data
 public function action(){
 $url = $this->checkurl();
 $imgurl = $this->collecturl ($url);
 $this->savafile($imgurl);
 }
 //url processing
 protected function checkurl(){
 $munprel = '/([0-9]+,[0-9] +)/i';
 $myurl;
 if(preg_match($munprel,$this->url,$arr)){
 $temp = substr($arr[0],1,strlen($arr[0 ])-2);
 $mymunber = explode(',',$temp);
 $temparr = explode($arr[0],$this->url);
 for($i=$mymunber[0 ];$i<=$mymunber[1];$i++){
 $myurl[] = $temparr[0].$i.$temparr[1];
 }
 }else{
 $myurl = $this- >url;
 }
 return $myurl;
 }
 //File saving
 protected function savafile($imgurl){
 if(!empty($imgurl)){
 foreach($imgurl[0] as $key= >$value){
 $filename = '';
 if(in_array($imgurl[1][$key],$this->style)){
 $size = @getimagesize($value);
 if ($size === false){
 continue;
 }
 list($w,$h,$t,$a) = $size;
 if($w<200 || $h<200){
 continue ;
 }
 ob_start();
 readfile($value);
 $obj = ob_get_contents();
 ob_end_clean();
 $dir = 'F:/php/';
 if(!is_dir($dir)) {
 mkdir($dir,0777);
 }
 if(!empty($this->prefix)){
 $filename = $dir.$this->prefix.date('Ymd').rand( 10000,99999).'.'.$imgurl[1][$key];
 }else{
 $filename = $dir.date('Ymd').rand(10000,99999).'.'.$imgurl [1][$key];
 }
 $fo = @fopen($filename,'wb');
 if($fo === false){
 echo '<script>alert("Failed to create file, The file directory cannot be written! ")</script>';
 exit;
 }
 $fw = fwrite($fo,$obj);
 echo ''. $filename.'Collection successful';
 }
 }
 }
 }

 //Address collection function, including image suffix name
 protected function collecturl($url){
 set_time_limit(0);
 if (is_array($url)){
 $arr = array();
 $imgkey = array();
 foreach($url as $value){
 $code = file_get_contents($value);
 preg_match_all(self:: prel,$code,$arrimg);
 $arr = array_merge($arr,$arrimg[0]);
 $imgkey = array_merge($imgkey,$arrimg[1]);
 }
 return array($arr, $imgkey);
 }else{
 $code = file_get_contents($url);
 preg_match_all(self::prel,$code,$arrimg);
 return $arrimg;
 }
 }
 //Check data
 private function checkdata($url,$prefix,$style){
 if(empty($url)){
 return 1;
 }elseif(!is_array($style)){
 return 2;
 }elseif(count($style )==0){
 return 3;
 }elseif(stripos($prefix,'.') !== false || stripos($prefix,'/') !== false || stripos($prefix,' |') !== false){
 return 4;
 }
 }
}







?>

class Collection{
 protected $url; //Collection address
 protected $prefix; //Rename file prefix
 protected $style; //The image format to be collected, pass in an array
 const prel = '/ (?:http?|https?)://(?:[^./()?]+).(?:[^./]+).(?:com|cn|net|org)/( ?:[^.:"'()?]+).(jpg|png|gif)/i'; //Collection rules
 //Constructor function
 function __construct($url,$prefix,$style){
 switch($this->checkdata($url,$prefix,$style)){
 case 1:
 echo '<script>alert("The collection address cannot be empty!")</script>';
 exit;
 break;
 case 2:
 echo '<script>alert("The image format to be collected should be an array!")</script>';
 exit;
 break;
 case 3:
 echo '<script>alert("The image format that needs to be collected cannot be empty!")</script>';
 exit;
 break;
 case 4:
 echo '<script>alert("The file name cannot be Contains . / | or starts with a space! ")</script>';
 exit;
 }
 $this->url = $url;
 $this->prefix = $prefix;
 $this-> ;style = $style;
 }
 //Start collecting data
 public function action(){
 $url = $this->checkurl();
 $imgurl = $this->collecturl($url);
 $this->savafile($imgurl);
 }
 //url processing
 protected function checkurl(){
 $munprel = '/([0-9]+,[0-9]+)/i';
 $myurl;
 if(preg_match($munprel,$this->url,$arr)){
 $temp = substr($arr[0],1,strlen($arr[0])-2);
 $mymunber = explode(',',$temp);
 $temparr = explode($arr[0],$this->url);
 for($i=$mymunber[0];$i<= $mymunber[1];$i++){
 $myurl[] = $temparr[0].$i.$temparr[1];
 }
 }else{
 $myurl = $this->url;
 }
 return $myurl;
 }
 //File saving
 protected function savafile($imgurl){
 if(!empty($imgurl)){
 foreach($imgurl[0] as $key=>$value){
 $filename = '';
 if(in_array($imgurl[1][$key],$this->style)){
 $size = @getimagesize($value);
 if($size === false){
 continue;
 }
 list($w,$h,$t,$a) = $size;
 if($w<200 || $h<200){
 continue;
 }
 ob_start( );
 readfile($value);
 $obj = ob_get_contents();
 ob_end_clean();
 $dir = 'F:/php/';
 if(!is_dir($dir)){
 mkdir($dir ,0777);
 }
 if(!empty($this->prefix)){
 $filename = $dir.$this->prefix.date('Ymd').rand(10000,99999).' .'.$imgurl[1][$key];
 }else{
 $filename = $dir.date('Ymd').rand(10000,99999).'.'.$imgurl[1][$key ];
 }
 $fo = @fopen($filename,'wb');
 if($fo === false){
 echo '<script>alert("Failed to create the file, the file directory is not writable! ")</script>';
 exit;
 }
 $fw = fwrite($fo,$obj);
 echo ''. $filename.'Collection successful';
 }
 }
 }
 }

 //Address collection function, including image suffix name
 protected function collecturl($url){
 set_time_limit(0);
 if (is_array($url)){
 $arr = array();
 $imgkey = array();
 foreach($url as $value){
 $code = file_get_contents($value);
 preg_match_all(self:: prel,$code,$arrimg);
 $arr = array_merge($arr,$arrimg[0]);
 $imgkey = array_merge($imgkey,$arrimg[1]);
 }
 return array($arr, $imgkey);
 }else{
 $code = file_get_contents($url);
 preg_match_all(self::prel,$code,$arrimg);
 return $arrimg;
 }
 }
 //Check data
 private function checkdata($url,$prefix,$style){
 if(empty($url)){
 return 1;
 }elseif(!is_array($style)){
 return 2;
 }elseif(count($style )==0){
 return 3;
 }elseif(stripos($prefix,'.') !== false || stripos($prefix,'/') !== false || stripos($prefix,' |') !== false){
 return 4;
 }
 }
}