如何使循环更改网址

Question

Basically I'm trying to parse IMDB ID from the urls given. Trying to make a loop to change the page number and continue scraping for IMDB TTs.

I'm expecting variable $page to increment by 1, so the $url will change and the foreach function in every loop will receive a new url and start scraping again.

But the problem is: The loop only parsing one page unlimited times, the page number is not increasing by 1.

   $url   = 'http://www.imdb.com/search/title?genres=animation&page='.$page.''; # this URL

for ($page = 1; $page <= 5 ; $page++) {

foreach((new DOMXpath(@DOMDocument::loadHTMLFile($url)))->query($expr) as $obj)
    preg_match($regex, $obj->value, $matches)
      && $ids[$matches[$match]] = 0;
    ;
$ids = array_keys($ids);


    print implode("<br /> ", $ids);

}

Example: http://surveygun.com/tt.php

Answer 1

You can try something like this, change $i <= num to how every many pages you want to loop through.

for( $i= 1 ; $i <= 165 ; $i++ ){
  $url   = 'http://www.imdb.com/search/title?genres=animation&page='.$i.'';

  // some code here

  sleep(2);
}

UPDATE(no dupes):

<?php
 for( $i= 1 ; $i <= 5 ; $i++ ){
 $url = "http://www.imdb.com/search/title?genres=animation&page=$i";
 $page = file_get_contents($url);
   preg_match_all("/id=\"sb_(tt\d{7})/", $page, $idinfo, PREG_SET_ORDER);
   foreach($idinfo as $idnumber){
   $idnumber = $idnumber[1];
   echo $idnumber.'<br>';
 }}
?>

You might consider putting a sleep in between loops as a polite measure ie sleep(2); this would put it to sleep for 2 secs.