请问这段代码到底什么问题? 为什么会报错;
Array( [0] => Array ( [id] => 3 [fid] => 0 [name] => 333 [son] => Array ( [0] => Array ( [id] => 2 [fid] => 3 [name] => 2_3 [son] => Array ( [0] => Array ( [id] => 4 [fid] => 2 [name] => 2_4 ) ) ) [1] => Array ( [id] => 5 [fid] => 3 [name] => 2_3 ) ) ) [1] => Array ( [id] => 1 [fid] => 0 [name] => 111 ))
这是一个tree结构的数组,我希望在每个数组元素上加一个层级元素;
function tree_add_level($tree){ foreach($tree as &$val){ if(!isset($val['_level'])){ $val['_level']=0;//顶层为0 } if(isset($val['son'])){ $val['son']['_level']=$val['_level']+1; //下级加1 tree_add_level($val['son']); } } return $tree;}
但是却提示语法错误,求解决方法,或者其他方式. 谢谢
回复讨论(解决方案)
提示: Warning: Cannot use a scalar value as an array in D:\Web\BOOT\newfile.php on line 28
tree_add_level($val['son']); 这句代码到底有什么问题? 递归下而已.
你需要判断一下$tree是否是数组
你需要判断一下$tree是否是数组
$tree 和 $tree['son'] 100%是数组; 测试的就是上面的案例数组;
你这个数组能粘贴出来吗,我测试一下
你需要判断一下$tree是否是数组
谢谢,我加的
你这个数组能粘贴出来吗,我测试一下
谢谢了,已经解决了; 是逻辑错误,少了层引用;
function tree_add_level(&$tree,$n=0){
foreach($tree as &$val){
$val['_level']=$n;
isset($val['son']) && tree_add_level($val['son'],$n+1);
}
}
警告其实不影响,只要你得到了你想要的结果

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