/
prepare_dataset.php
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/
prepare_dataset.php
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<?php
/* FUNCTIONS */
/* prepareDataset()
* This function accumulates tweets from the various files
* listed in the file list. It requires the setDatasetName()
* function to be executed first. */
/* setDatasetName($name)
* This function sets the name for the dataset. If the
* parameter $name is not specified, it automatically
* sets the current date and time as filename. */
/* CONSTANTS */
/* Filename for the file (JSON)) that stores the
* names of tweet files (CSV) collected so far. */
//define("LIST_TWEET_FILENAMES", "ListTweetFile");
/* The Directory which contains the tweet files (CSV)
* to form a dataset of. */
define("DIR_TWEET_FILES", "DirTweetFiles");
/* Filename for the file (JSON)) that stores the
* list of tweet IDs added to the dataset so far. */
define("LIST_TWEET_IDS", "ListTweetID");
/* Filename for the file (JSON)) that stores the list of
* keywords and their corresponding catagory names.. */
define("LIST_KEYWORDS", "ListKeyword");
/* GLOBAL VARIABLES */
/* Global arrays storing filenames, tweet IDs and keywords */
$FileNames=array();
$TweetIDs=array();
$KeyWords=array();
/* FUNCTION LISTING */
function prepareDataset()
{
global $FileNames;
loadFileNames();
loadTweetIDs();
loadKeywords();
foreach($FileNames as $file_name)
collectTweetsFrom($file_name);
storeTweetIDs();
}
function setDatasetName($name=null)
{
global $dataset_file_name;
if($name)
$dataset_file_name=$name;
else
$dataset_file_name="dataset.".date("Y-m-d_H-i-s");
}
function collectTweetsFrom($file_name)
{
global $TweetIDs, $KeyWords, $dataset_file_name;
if(file_exists(constant("DIR_TWEET_FILES")."/".$file_name.".csv"))
{
$fp=fopen(constant("DIR_TWEET_FILES")."/".$file_name.".csv", "r");
$fp_dataset=fopen($dataset_file_name.".csv", "a");
while(!feof($fp))
{
$new_tweet=fgetcsv($fp, 256);
//if($new_tweet && (!in_array((string) $new_tweet[2], $TweetIDs)))
if($new_tweet && (!isset($TweetIDs[$new_tweet[2]])))
{
//array_push($TweetIDs, (string) $new_tweet[2]);
$TweetIDs[$new_tweet[2]] = 1;
$new_tweet[1]=replaceKeyword($new_tweet[1], $new_tweet[0]);
$new_tweet[0]=$KeyWords[$new_tweet[0]];
unset($new_tweet[2]);
fputcsv($fp_dataset, $new_tweet);
}
}
fclose($fp);
fclose($fp_dataset);
}
}
function replaceKeyword($tweet_text, $keyword)
{
global $KeyWords;
$tweet_text=preg_replace("/$keyword/i", "", $tweet_text);
return $tweet_text;
}
/*
function loadFileNames()
{
global $FileNames;
$FileNames=json_decode(file_get_contents(constant("LIST_TWEET_FILENAMES").".json", true));
}
*/
function loadFileNames()
{
global $FileNames;
$dh=opendir(constant("DIR_TWEET_FILES"));
while($new_file_name=readdir($dh))
{
if($new_file_name!="." && $new_file_name!="..")
array_push($FileNames, preg_replace("/\.csv/", "", $new_file_name));
}
}
function loadTweetIDs()
{
global $TweetIDs;
if(file_exists(constant("LIST_TWEET_IDS").".json"))
{
$TweetIDs_temp=json_decode(file_get_contents(constant("LIST_TWEET_IDS").".json", true));
foreach($TweetIDs_temp as $id)
$TweetIDs[$id] = 1;
}
}
function storeTweetIDs()
{
global $TweetIDs;
$TweetIDs_temp=array_keys($TweetIDs);
file_put_contents(constant("LIST_TWEET_IDS").".json", json_encode($TweetIDs_temp));
}
function loadKeywords()
{
global $KeyWords;
$KeyWords=(array) json_decode(file_get_contents(constant("LIST_KEYWORDS").".json", true));
}
?>