Show selected in multiple selection in PHP loop - php

Question

I am listing multiple categories.
<?php
function listCategory($id = 0, $string = 0, $catID = 0){
global $sib;
$query = $sib -> prepare( "select * from categories where subCatID=? and isActive=? order by toSort asc" );
$query -> execute( array($id, 1) );
$view = $query -> fetchAll( PDO::FETCH_ASSOC );
$xe = $querye -> rowCount();
if ( $xe ) {
foreach ($view as $row) {
if ( $row["subCatID"] == 0 ) {
echo '<optgroup label="' . $row["title"] . '">';
} else {
echo '<option value="' . $row["categoryID"] . '" >';
}
echo str_repeat( " - ", $string ) . $row["title"];
listCategory( $row["categoryID"], $string + 1, $catID );
if ( $row["subCatID"] == 0 ) {
echo '</optgroup>';
} else {
echo '</option>';
}
}
} else { return false; }
}
listCategory( 0, 0, 0 );
?>
There is no problem with listing. Array contains category ID numbers.
$catIDs = array(4,7,18);
The categories whose id numbers are listed must be selected that are equal to their id number.
I've made a few attempts at this. I could not be successful.
I've made a few attempts at this. I could not be successful.

Answer 1

I solved the problem.
echo '<option value="' . $row["categoryID"] . '" >';
I edited this field
$catListA = array(4,7,18);
$selected = in_array($row["categoryID"],$catListA ) ? "selected" : "";
echo '<option value="' . $row["categoryID"] . '" '. $selected .'>';