$json = '[{"id":27,"children":[{"id":30,"children":[{"id":31}]}]},{"id":28,"children":[{"id":29}]},{"id":32}]';
$arry = json_decode($json,true);
print_r($arry);
echo"";
print_r(foo($arry));
echo"";
function foo($ar, $level=0, $parent=0,&$res=array()) {
foreach($ar as $v) {
$t = array();
$v['level'] = $level;
$v['parent'] = $parent;
if(isset($v['children'])) {
$t = $v['children'];
unset($v['children']);
}
$res[] = $v;
if($t) foo($t, $level+1, $v['id'], $res);
}
return $res;
}
?>
Array ( [0] => Array ( [id] => 27 [children] => Array ( [0] => Array ( [id] => 30 [children] => Array ( [0] => Array ( [id] => 31 ) ) ) ) ) [1] => Array ( [id] => 28 [children] => Array ( [0] => Array ( [id] => 29 ) ) ) [2] => Array ( [id] => 32 ) )
Array ( [0] => Array ( [id] => 27 [level] => 0 [parent] => 0 ) [1] => Array ( [id] => 30 [level] => 1 [parent] => 27 ) [2] => Array ( [id] => 31 [level] => 2 [parent] => 30 ) [3] => Array ( [id] => 28 [level] => 0 [parent] => 0 ) [4] => Array ( [id] => 29 [level] => 1 [parent] => 28 ) [5] => Array ( [id] => 32 [level] => 0 [parent] => 0 ) )
如果是这样
function foo($ar, $level=0, $parent=0, $res=array()) {
foreach($ar as $v) {
$t = array();
$v['level'] = $level;
$v['parent'] = $parent;
if(isset($v['children'])) {
$t = $v['children'];
unset($v['children']);
}
$res[] = $v;
if($t) foo($t, $level+1, $v['id'], $res);
}
return $res;
}
结果 则为：
Array ( [0] => Array ( [id] => 27 [level] => 0 [parent] => 0 ) [1] => Array ( [id] => 28 [level] => 0 [parent] => 0 ) [2] => Array ( [id] => 32 [level] => 0 [parent] => 0 ) )
请高手结合此实例，讲解下 传值、传址的区别，谢谢。
值传递：
拷贝一份原始数据进行操作，不改变原值。
引用传递：
操作原始数据，操作过后原始数据会改变。
数组值传递实例代码：<?phpfunction main() { $cc = array( 'a','b' ); change($cc); var_dump($cc); die;}function change($cc){ $cc = array('dd');}main();?>output:array(2) { [0]=> string(1) "a" [1]=> string(1) "b"}数组引用传递<?phpfunction main() { $cc = array( 'a','b' ); change($cc); var_dump($cc); die;}function change(&$cc){ $cc = array('dd');}main();?>outpout:array(1) { [0]=> string(2) "dd"} $res[] = $v;
if($t) foo($t, $level+1, $v['id'], $res)
----这两个语句在函数 foo 内部，但原理是一样的。如同楼上所举的例子
传值不会影响原数组，传地址会。
例子：
地址引用
<?php$arr = array(1,2,3,4,5);pop($arr);print_r($arr);function pop(&$arr){ array_pop($arr);}?><?php$arr = array(1,2,3,4,5);$arr1 = pop($arr);print_r($arr);print_r($arr1);function pop($arr){ array_pop($arr); return $arr;}?> 说白了就是，函数的参数，默认都是复制一份的，这样你函数内怎么折腾都不会影响到使用函数时传过来的变量
加上&就不会复制，而直接用了
传值就是多复制一份，相互不影响
引用就是同时操作同一份数据，相互影响
