1.8.3

Update composer.json

sum() update

1.8.2

Update PhpCollection.php

sum hotfix

1.8.1

Update PhpCollection.php

keyBy add function param support, add sum(key, function, without key) method

1.8.0

Update PhpCollection.php

1.7.7

Update PhpCollection.php

1.7.6

add singleElement option to collect()

1.7.5: Update PhpCollection.php

push/add/append
prepend

1.7.4

Update collect.php

add namespace

1.7.3

Update PhpCollection.php

1.7.2

Update PhpCollection.php