收集了一些方法，用来生产域名然后查询注册信息。
代码语言：javascript复制<?php
ini_set('memory_limit','10000M');
function combinations($arrays, $i = 0) {
if (!isset($arrays[$i])) {
return array();
}
if ($i == count($arrays) - 1) {
return $arrays[$i];
}
// get combinations from subsequent arrays
$tmp = combinations($arrays, $i 1);
$result = array();
// concat each array from tmp with each element from $arrays[$i]
foreach ($arrays[$i] as $v) {
foreach ($tmp as $t) {
$result[] = is_array($t) ?
array_merge(array($v), $t) :
array($v, $t);
}
}
return $result;
}
/**
* Generate all the possible combinations among a set of nested arrays.
*
* @param array $data The entrypoint array container.
* @param array $all The final container (used internally).
* @param array $group The sub container (used internally).
* @param mixed $val The value to append (used internally).
* @param int $i The key index (used internally).
*/
function generate_combinations(array $data, array &$all = array(), array $group = array(), $value = null, $i = 0)
{
$keys = array_keys($data);
if (isset($value) === true) {
array_push($group, $value);
}
if ($i >= count($data)) {
array_push($all, $group);
}
else {
$currentKey = $keys[$i];
$currentElement = $data[$currentKey];
foreach ($currentElement as $val) {
generate_combinations($data, $all, $group, $val, $i 1);
}
}
return $all;
}
function cartesian_product($a) {
$result = array(array());
foreach ($a as $list) {
$_tmp = array();
foreach ($result as $result_item) {
foreach ($list as $list_item) {
$_tmp[] = array_merge($result_item, array($list_item));
}
}
$result = $_tmp;
}
return $result;
}
function get_combinations($arrays) {
$result = array(array());
foreach ($arrays as $property => $property_values) {
$tmp = array();
foreach ($result as $result_item) {
foreach ($property_values as $property_value) {
$tmp[] = array_merge($result_item, array($property => $property_value));
}
}
$result = $tmp;
}
return $result;
}
$data = array(
range('a', 'z'),
range('a', 'z'),
range('a', 'z'),
range('a', 'z'),
range('a', 'z'),
);
$combos = generate_combinations($data);
echo sizeof($combos);
echo "n";
echo "not real: ".(memory_get_peak_usage(false)/1024/1024)." MiBn";
echo "real: ".(memory_get_peak_usage(true)/1024/1024)." MiBnn";
