How to include other arrays in an array in php?

<code>        $name1=$_POST['name'];
        $hobbyS1=array();
        $hobbyS1=$_POST['hobbyS'];
        $sre1=$_POST['sre'];

        $fields = array($name1,$sre1);
        echo implode($fields);</code>

As shown in the above code, it displays normally.
I want to put the array hobbyS1 into $fields. How can I achieve this?
This is what I do
$fields = array($name1,$sre1,$hobbyS1);
No,
how should I put it? Thank you

Reply content:

<code>        $name1=$_POST['name'];
        $hobbyS1=array();
        $hobbyS1=$_POST['hobbyS'];
        $sre1=$_POST['sre'];

        $fields = array($name1,$sre1);
        echo implode($fields);</code>

As shown in the above code, it displays normally.
I want to put the array hobbyS1 into $fields. How can I achieve this?
This is what I do
$fields = array($name1,$sre1,$hobbyS1);
No,
how should I put it? Thank you

<code>var_dump($_POST)   看下有没有值，正常是可以的
</code>

$fileds = array($name1, $sre1); can be used after

<code>array_push($fileds, $hobbyS1); 
OR
$fields[] = $hobbyS1
</code>

After execution:

<code>$fields = array($name,$sre1);</code>

Use:

<code>$fields[] = $hobbyS1;
</code>

I tried it and it works