好處是, 下次直接把檔讀進 array 立即可查詢, 如果資料不常改變, 查詢頻率普通時用
// init my dict. keys and cache array to disk
if (!file_exists($arraypath)) {
if ($handle) {
while (!feof($handle)) {
$buffer = trim(fgets($handle));
$my_dict[$buffer] = 0;
}
fclose($handle);
}
$serialized = serialize($my_dict);
$handle = fopen($arraypath, 'w');
if ($handle) {
fwrite($handle, $serialized);
fclose($handle);
}
} else {
$handle = fopen($arraypath, 'r');
if ($handle) {
$my_dict = unserialize(fread($handle, filesize($arraypath)));
fclose($handle);
}
}