関数のパラメータが配列の場合、値による受け渡しとアドレスによる受け渡しの違いについて、専門家の方は例を挙げて説明してください。

$json = '[{"id":27,"children":[{"id":30,"children":[{"id":31}]}]} ,{"id":28,"children":[{"id":29}]},{"id":32}]';
$arry = json_decode($json,true);
print_r($arry);
エコー"
";
print_r(foo($arry));
エコー"
";
function foo($ar, $level=0, $parent=0,&$res=array()) {
foreach($ar as $v) {
$t = array();
$v['レベル'] = $レベル;
$v['parent'] = $parent;
if(isset($v['children'])) {
$t = $v['子供'];
unset($v['children']);

} $res[] = $v;
if($t) foo($t, $level+1, $v['id'], $res);
                                                     }
return $res;
}
?>
配列( [0] => 配列 ( [id] => 27 [子] => 配列 ( [0] => 配列 ( [id] => 30 [子] => 配列( [0] => 配列 ( [id] => 31 ) ) ) ) ) [1] => 配列 ( [id] => 28 [children] => 配列 ( [0] =>配列 ( [id] => 29 ) ) ) [2] => 配列 ( [id] => 32 ) )

配列 ( [0] => 配列 ( [id] => ; 27 [レベル] => 0 [親] => 0 ) [1] => 配列 ( [id] => 1 [親] => 27 ) => 配列 ( [id] => 31 [レベル] => 2 [親] => 30 ) [3] => 配列 ( [id] => 28 [レベル] => 0 [親] => 0 ) [4] => 配列 ( [id] => 29 [レベル] => 1 [親] => 28 ) [5] => 配列; 32 [レベル] => 0 [親] => 0 ) )

如果是样
function foo($ar, $level=0, $res=array ()) {
foreach($ar as $v) {
$t = array();
$v['レベル'] = $レベル;
$v['parent'] = $parent;
if(isset($v['children'])) {
$t = $v['子供'];
                                                                                              unset($v['children']);

} $res[] = $v;
if($t) foo($t, $level+1, $v['id'], $res);
}
$res;
}
結果 则:
配列( [0] => 配列 ( [id] => 27 [レベル] => 0 [親] => 0 ) [1] = > 配列 ( [id] => 28 [レベル] => 0 [親] => 0 ) [2] => 配列 ( [id] => 32 [レベル] => 0 [親] =>

逆承認(解決案)

值伝達:

初期データは操作され、変更されません。

参照伝達:
操作によって元のデータが変更されます。 2011/12/10/2283570.html

$res[] = $v;
if($t) foo($t, $level+1, $v['id'], $res)
----この这两个语句在関数数 foo ，ただし原理は一样的同じ楼上の例子

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"}

は、原数値グループに影響を与えず、地址会を伝達します。

例:

地址参照

出力：

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

传值

<?php$arr = array(1,2,3,4,5);pop($arr);print_r($arr);function pop(&$arr){    array_pop($arr);}?>

出力：
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )
配列( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

说白了就是，関数的パラメータ，默认都これは复制一份的，この样你関数内怎么折腾都不影響使用関数時送来的变量

<?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;}?>

加上&就不会复制，而直接使用了

传值就是多重制一份，相互不影响
参照は同じ份データを同時に操作します，相互影響响