我尝试选择由json_decode() 构造的数组的数据。
原则上它是一个未知维度的多数组。
首先，我想在这个数组中递归搜索一个值。作为下一步，我想获得一些其他上维度的值。所以这里是一个例子：
我搜索："2345"
....
$json[3][6]['journal']['headline']="news"
$json[3][6]['journal']['article']=2345
....
$json[8]['journal']['headline']="weather"
$json[8]['journal']['article']=2345
....
之后我想获取元素headline的值（返回“新闻”和“天气”）
可能是元素2345可以在不同维度找到！！！
【问题讨论】：
标签： php arrays json search recursion
只需创建一个用于编译未知数组的函数。试试这个
$json[1][6]['journal']['headline']="news";
$json[1][6]['journal']['article']=2345;
$json[3][6]['journal']['headline']="HOT";
$json[3][6]['journal']['article']=2345;
$json[8]['journal']['headline']="weather";
$json[8]['journal']['article']=2345;
$json[10]['journal']['headline']="weather";
$json[10]['journal']['article']=2345;
$GLOBALS['list_scan'] = array();
$result = array();
foreach ($json as $key => $value)
{
if (is_array($value)) {
_compile_scan($key, $value);
}
}
echo "<pre>";
print_r($GLOBALS['list_scan']);
echo "</pre>";
$search = "2345";
$keyword = "article";
$keyFinder = "headline";
foreach ($GLOBALS['list_scan'] as $key => $value)
{
if ($value == $search)
{
$addr = substr($key, 0, -(strlen($keyword))).$keyFinder;
if (!empty($GLOBALS['list_scan'][$addr]))
{
$result[] = $GLOBALS['list_scan'][$addr];
}
}
}
echo "<pre>";
print_r($result);
echo "</pre>";
function _compile_scan($index, $value)
{
$pointer =& $GLOBALS['list_scan'];
foreach ($value as $key => $val)
{
$temp = '';
$temp = $index.'|'.$key;
if (is_array($val))
{
// $pointer[$temp] = $val;
_compile_scan($temp, $val);
}
else $pointer[$temp] = $val;
}
}
输出：
Array
(
[1|6|journal|headline] => news
[1|6|journal|article] => 2345
[3|6|journal|headline] => HOT
[3|6|journal|article] => 2345
[8|journal|headline] => weather
[8|journal|article] => 2345
[9|journal|headline] => Others
[9|journal|article] => 234521
)
Array
(
[0] => news
[1] => HOT
[2] => weather
)
【讨论】：
可能有人可以使用RecursiveIteratorIterator 对象来做到这一点，但我个人很难使用迭代器对象，所以这里有一个相当健壮的系统：
<?php
// This will traverse an array and find the
// value while storing the base key
class RecurseLocator
{
public static $saved = array();
public static $find;
public static $trigger;
public static function Initialize($find = false)
{
self::$find = $find;
}
public static function Recursive(array $array)
{
foreach($array as $key => $value) {
if(!isset(self::$trigger) || (isset(self::$trigger) && empty(self::$trigger))) {
if(is_numeric($key))
self::$trigger = $key;
}
if(!is_array($value)) {
if($value == self::$find) {
self::$saved[self::$trigger] = $value;
}
}
if(is_array($value)) {
$value = self::Recursive($value);
if(!is_numeric($key))
self::$trigger = "";
}
$return[$key] = $value;
}
return $return;
}
}
// This class will traverse an array searching
// for a specific key or keys
class RecurseSearch
{
public $data;
public $compare;
public function Find($array = '',$find,$recursive = true)
{
$find = (is_array($find))? implode("|",$find):$find;
if(is_array($array)) {
foreach($array as $key => $value) {
if(preg_match("/$find/",$key))
$this->compare[$key] = $value;
if($recursive == true) {
if(!is_array($value)) {
if(preg_match("/$find/",$key)) {
$this->data[$key][] = $value;
}
$array[$key] = $value;
}
else {
if(preg_match("/$find/",$key))
$this->data[$key][] = $this->Find($value,$find);
$array[$key] = $this->Find($value,$find);
}
}
else {
if(preg_match("/$find/",$key))
$this->data[$key] = $value;
}
}
$this->data = (isset($this->data))? $this->data:false;
return $this;
}
}
}
// This function just wraps the RecurseSearch class
function get_key_value($array = array(), $find = array(),$recursive = true)
{
$finder = new RecurseSearch();
return $finder->Find($array,$find,$recursive);
}
用法：
$json[3][6]['journal']['headline'] = "news";
$json[3][6]['journal']['article'] = 2345;
$json[8]['journal']['headline'] = "weather";
$json[8]['journal']['article'] = 2345;
$json[4][1]['journal']['headline'] = "news";
$json[4][1]['journal']['article'] = 22245;
$json[5]['journal']['headline'] = "weather";
$json[5]['journal']['article'] = 233345;
// Set the search criteria
RecurseLocator::Initialize(2345);
// Traverse the array looking for value
$arr = RecurseLocator::Recursive($json);
// If found, will be stored here
$iso = RecurseLocator::$saved;
/* $iso looks like:
Array
(
[3] => 2345
[8] => 2345
)
*/
// Loop through the $iso array
foreach($iso as $key => $value) {
// Save to new array your search results
$new[] = get_key_value($json[$key],array("headline","article"),true);
}
/* $new looks like:
Array
(
[0] => RecurseSearch Object
(
[data] => Array
(
[headline] => Array
(
[0] => news
)
[article] => Array
(
[0] => 2345
)
)
[compare] => Array
(
[headline] => news
[article] => 2345
)
)
[1] => RecurseSearch Object
(
[data] => Array
(
[headline] => Array
(
[0] => weather
)
[article] => Array
(
[0] => 2345
)
)
[compare] => Array
(
[headline] => weather
[article] => 2345
)
)
)
*/
?>
顺便说一句，上面的类存储多个在[data]中找到的，然后将它们也存储在[compare]中，但是如果在一个数组中找到多个相同的键，[compare]将覆盖自己[data] 将继续添加值。
【讨论】：