Blade Directive inside each other - Class name must be a valid object or a string

[TheArKaID]

Laravel: 10.13.5
PHP: 8.2.7

I wanna use php code inside a foreach directive like this:

<div class="vertical-timeline vertical-timeline--animate vertical-timeline--one-column" style="left: 60px">
    @foreach ($documentRequest->documentType->requestApprovers as $ra)
        @php
            $approve = $documentRequest->documentRequestApprovals()->where('request_approver_id', $ra->id)->first();
            $approveStatus = $approve?->status;
            $approveColor = '';
            $approveMsg = '';
            switch ($approveStatus) {
                case $approve::$PENDING:
                    $approveColor = 'primary';
                    $approveMsg = 'Pending..';
                    break;
                case $approve::$APPROVED:
                    $approveColor = 'success';
                    $approveMsg = 'Approved';
                    break;
                case $approve::$RETURNED:
                    $approveColor = 'warning';
                    $approveMsg = 'Returned';
                    break;
                case $approve::$CANCELED:
                    $approveColor = 'danger';
                    $approveMsg = 'Canceled';
                    break;
                default:
                    $approveColor = 'secondary';
                    $approveMsg = 'Waiting..';
                    break;
            }
        @endphp
        <div class="vertical-timeline-item vertical-timeline-element">
            <div>
                <span class="vertical-timeline-element-icon bounce-in">
                    <i class="badge badge-dot badge-dot-xl badge-{{$approveColor}}"> </i>
                </span>
                <div class="vertical-timeline-element-content bounce-in">
                    <p>{{ $ra->role->name }} <b class="text-{{ $approveColor }}">
                        {{ $approveMsg }}</b>
                    </p>
                    <span class="vertical-timeline-element-date" style="left: -150px;">{{ $approveStatus !== null ? $approve->created_at : '--'}}</span>
                </div>
            </div>
        </div>
    @endforeach
</div>

But there's a Class name must be a valid object or a string error and the error page marked at @php.

It's working fine if I use the {{ }} in the line where I wanna show the data, like

<i class="badge badge-dot badge-dot-xl badge-{{$approveStatus !== null ? ($approveStatus === 1 ? 'primary' : 'warning') : 'secondary' }}"> </i>

But I think that is too many ternary operator in a line.
Is it possible to use @php inside @foreach?

[TheArKaID]

Gzz...My bad. It's the switch...case... $approve::$VARIABLE that caused the error.