how to find if resource has children?

The code above seems like overkill to me (and it makes me nervous to use PHP reserved words as variable names):

[[!HasChildren? &id = `23`]]

<?php
$document = $modx->getObject('modresource', $id);

if($document){
    return $document->hasChildren()? 'hasChildren' : 'noChildren';
}

return '';

or, if you want to use isfolder instead:

<?php
$document = $modx->getObject('modresource', $id);

if($document){
    return $document->get('isfolder')? 'hasChildren' : 'noChildren';
}

return '';

The code above seems like overkill to me (and it makes me nervous to use PHP reserved words as variable names):

[[!HasChildren? &id = `23`]]

<!--?php
$document = $modx--->getObject('modResource', $id);

if($document){
    return $document->hasChildren()? 'hasChildren' : 'noChildren';
}

return '';

or, if you want to use isfolder instead:

<!--?php
$document = $modx--->getObject('modResource', $id);

if($document){
    return $document->get('isfolder')? 'hasChildren' : 'noChildren';
}

return '';

you can try this:

       $document = $modx->getObject('modResource', $id);
        
       if($document){
           $c = $modx->newQuery('modResource');
           $c->where(array(
               'parent' => $document->get('id'),
               'published' => '1',
               'deleted' => '0'
           ));
           $has_children = $modx->getCount('modResource',$c);           
           return $has_children ? 'hasChildren' : 'noChildren';
       }

&tpl=`@INLINE <span class="[[!hasChildren?&id=`[[+id]]`]]"><a href="[[+link]]">[[+menutitle:]]</a>[[+wrapper]]</span>`