, foreach can only traverse the first child when traversing a three-dimensional array.

For expert guidance, foreach can only traverse the first child when traversing a three-dimensional array, which is why?

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 $countParent = $key +1+ $count; $child = 0;
if (Is_array ($val [$key])) foreach ($val [$key] as $v) {//This only executes once
if ($val [' id ']== $v [' parent_id ']) {
$count = $count +1; $child = $child +1;
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------to solve the idea----------------------
Not particularly clear about your data structure, check if this condition is satisfied
if (Is_array ($val [$key]))
------to solve the idea----------------------
Your outer loop is
foreach ($monitorList as $key = $val)
The condition for entering the inner loop is
if (Is_array ($val [$key]))
There is no output when the condition is not met



------to solve the idea----------------------
if (Is_array ($val)) {//Determines whether the value of $val is an array, and if so, goes to the downlevel traversal
------to solve the idea----------------------
Ought to be
if (Is_array ($val)) Judge if there is a next layer

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