如何将变量传递到记录集或集合的过滤器中

Question

So I have a variable and a recordset:

$firstRecordID = 1;
$records = Recordset::all();

I want to filter the recordset:

$filteredRecords = $records->find(function($record){
    if($record->id == $firstRecordID)
        return true;
    else
        return false;
});

Unfortunately, the closure has no clue what $firstRecordID is.

How do I pass in the ID?

Answer 1

You can bind the $firstRecordID to the closure:

$firstRecordID = 1;
$records = Recordset::all();

$filterFunction = function ($record) use ($firstRecordID) {
    return ($record->id == $firstRecordID);
};

$filteredRecords = $records->find($filterFunction);

I also simplified your lambda into a single line.