PHP write crawler, crawl to specify various images on the site page

intends to use PHP to implement a crawler, which is a crawl of the specified page of the picture of a program, the other parts have not been debugged well, first put this up

1<?PHP2 $string=file_get_contents("Http://www.baidu.com");3 Echo' Size: '.strlen($string)." </br> ";4 $length=strlen($string);5Searchimg ($string,$length);6  7 8 9 functionSearchimg ($string,$length){Ten      for($i= 0;$i<$length;$i++) {  One         if(($string[$i]== ' s ') && ($string[$i+1]== ' R ') && ($string[$i+2]== ' C ')){ A             $index=$i; -              -             $SCR=SEARCHSCR ($index,$length,$string);//format for "http://.......***" the          -             $type=judgetype ($SCR); -             // -             if($type! = "Error"){ +                 Echo' Location: '.$index.‘ </br> '; -                     Echo' Scourse: '.$SCR.‘ </br> '; +                     Echo' Type: '.$type." </br> "; A             $filename= ' pic/'.$index.‘.‘.$type; at             $handle=fopen($filename, "a"); -  -             $scrString=file_get_contents($SCR); -             fwrite($handle,$scrString); -             fclose($handle); -         } in  -     } to  + } - } the  * functionJudgetype ($SCR){ $ $length=strlen($SCR);Panax Notoginseng   - if((($SCR[$length-1]== ' F ' | |$SCR[$length-1]== ' F ')) && (($SCR[$length-2]== ' i ') | | ($SCR[$length-2]== ' I '))){ the return"GIF"; + } A Else if((($SCR[$length-1]== ' G ' | |$SCR[$length-1]== ' G ')) && (($SCR[$length-2]== ' P ') | | ($SCR[$length-2]== ' P '))) { the      return"JPG"; + } - Else if((($SCR[$length-1]== ' G ' | |$SCR[$length-1]== ' G ')) && (($SCR[$length-2]== ' n ') | | ($SCR[$length-2]== ' N '))){ $     return"PNG"; $ } - Else if((($SCR[$length-1]== ' G ' | |$SCR[$length-1]== ' G ')) && (($SCR[$length-2]== ' E ') | | ($SCR[$length-2]== ' E '))){ -     return"JPEG"; the } - Else{Wuyi     return"Error"; the } - } Wu  -  About  $ functionSEARCHSCR ($index,$length,$string){ -     if($string[$index+5]=== "H"){ -           -         $SCR= ' '; A         }     +     Else{ the           -         $SCR= ' http: '; $         } the  the      for($i=$index+5;$i<$length;$i++) {  the         if($string[$i]=== ' "'){ the             //$SCR = $scr. ' "; -              Break; in         } the         Else{ the         $SCR=$SCR.$string[$i]; About             } the     } the     return $SCR; the     //echo $scr; +      -  the }Bayi  the  the  -?>

Mainly said some shortcomings, the dynamic generation of the picture can not be included, CSS images can not be included, this is the next to improve the place, the crawler is constantly perfected, PHP string is still pretty tired ...

PHP write crawler, crawl to specify various images on the site page