Return page titles for a specified category

Using MediaWiki api.php

1. Hello World!
2. Return page titles for a specified category
3. Return template contents from a wiki page
4. Wiki built-in templates

Get every page title for a specified category

This fetches 100 page titles at a time with 5 second pauses between fetches to avoid loading the wiki too much.

<?php
  // =======================================================================
  // === These constant values must be set before running the script =======
  // =======================================================================
  
  define("API_URL", 'http://wiki.xkcd.com/wgh/api.php');    // Search any wiki page source for "api.php" to find this path on other MediaWiki sites
  define("THE_CATEGORY", "Category:Consecutive_geohash_achievement");
  
  // =======================================================================
  // Return an array containing the cmcontinue value followed by page titles
  // Index [0] contains cmcontinue needed to get the next page
  // Index [1] up to [cmlimit] contains the page titles, could be zero items
  // =======================================================================
  function getTitlesInCategory($cmtitle, $cmlimit = 10, $cmcontinue = "")
  {
    if ($cmcontinue == "") { $continue = ""; } else { $continue = "&cmcontinue=$cmcontinue"; }

    $url         = API_URL . "?action=query&format=json&list=categorymembers&cmtitle=$cmtitle&cmlimit=$cmlimit$continue";
    $json        = file_get_contents($url);
    $decodedjson = json_decode($json, true);
    
    echo $url . "\n";
    
    $titles = array();
    
    if (isset($decodedjson['query-continue']))
    {
      $titles[] = $decodedjson['query-continue']['categorymembers']['cmcontinue'];  // Next page if there is one
    }
    else
    {
      $titles[] = "";
    }

    foreach($decodedjson['query']['categorymembers'] as $value)
    {
      $titles[] = $value['title'];
    }
    
    return $titles;
  }
  // =======================================================================

  // =======================================================================
  // Return an array containing ALL page titles for the category
  // =======================================================================
  function getAllTitlesInCategory($cmtitle)
  {
    $allTitles = array();
  
    $titles = getTitlesInCategory($cmtitle, 100);  
    // print_r($titles);  
    $cmcontinue = $titles[0];
    unset($titles[0]);
    $allTitles = array_merge($allTitles, $titles);
  
    while($cmcontinue != "")
    {
      sleep(5);
      $titles = getTitlesInCategory($cmtitle, 100, $cmcontinue);
      // print_r($titles);  
      $cmcontinue = $titles[0];
      unset($titles[0]);
      $allTitles = array_merge($allTitles, $titles);
    }
    
    return $allTitles;
  }
  // =======================================================================
  
  // =======================================================================
  // main program
  // =======================================================================
  
  print_r(getAllTitlesInCategory(THE_CATEGORY));
?>