Question

I have a project where it searches for a specific entry in a specific column and then returns all documents that have that entry in that column. It works almost perfectly except when that entry field is empty it gives an error. Let me try to illustrate below.

My DB:

A|B|C|D
1|1|5|5
2|1| |6
3|2|7|7
4|2|8|8

My PHP:

$query = array( "B" => 1);
$cursor = $collection->find( $query );

foreach ($cursor as $obj) {
    echo $obj["A"] . $obj["B"] . $obj["C"]  .$obj["D"] . "<br />";
}

My output is:

1155
21Notice: Undefined index: C6

How do I go about not giving any errors. Just treat it as an empty field. I’m not sure if this is a common problem but, I’m still new to PHP and very new to MongoDB.

Answer 1

Use isset() to find out if the key exists in the array before trying to index using it

foreach ($cursor as $obj) {
    echo $obj["A"] . $obj["B"]. (isset($obj["C"]) ? $obj["C"] : '' ) .$obj["D"]."<br />";
   //It will replace each blank with an ''
    }