000-collection.php

<?php

    public function sort()
    {
        print " AAA <--->\n";
        foreach ($this->items as $item) {
            print $item->data()->get('title')."\n";
        }
        print " AAA <--->\n";
        uasort($this->items, array($this->sorter, 'sort'));

        print " BBB <--->\n";
        foreach ($this->items as $item) {
            print $item->data()->get('title')."\n";
        }
        print " BBB  <--->\n";
    }

001-output.txt

 AAA <--->
Code Climate
ESP IT
Origin Eight
Robofirm
Gold Sponsorship Available!
Silver Sponsorship Available!
Bronze Sponsorship Available!
Community Sponsorship Available!
Platinum sponsorship available!
Valere
Westwerk
 AAA <--->
 [ strnatcmp(SponsorshipAvailable, ESPIT) ]
 [ strnatcmp(SponsorshipAvailable, OriginEight) ]
 [ strnatcmp(SponsorshipAvailable, Robofirm) ]
 [ strnatcmp(SponsorshipAvailable, SponsorshipAvailable) ]
 [ strnatcmp(Westwerk, SponsorshipAvailable) ]
 [ strnatcmp(Valere, SponsorshipAvailable) ]
 [ strnatcmp(SponsorshipAvailable, SponsorshipAvailable) ]
 [ strnatcmp(SponsorshipAvailable, CodeClimate) ]
 [ strnatcmp(SponsorshipAvailable, SponsorshipAvailable) ]
 [ strnatcmp(SponsorshipAvailable, SponsorshipAvailable) ]
 [ strnatcmp(SponsorshipAvailable, SponsorshipAvailable) ]
 [ strnatcmp(Westwerk, SponsorshipAvailable) ]
 [ strnatcmp(Valere, SponsorshipAvailable) ]
 [ strnatcmp(SponsorshipAvailable, SponsorshipAvailable) ]
 [ strnatcmp(Westwerk, Valere) ]
 [ strnatcmp(OriginEight, ESPIT) ]
 [ strnatcmp(OriginEight, SponsorshipAvailable) ]
 [ strnatcmp(CodeClimate, OriginEight) ]
 [ strnatcmp(OriginEight, Robofirm) ]
 [ strnatcmp(SponsorshipAvailable, OriginEight) ]
 [ strnatcmp(Robofirm, OriginEight) ]
 [ strnatcmp(ESPIT, CodeClimate) ]
 [ strnatcmp(SponsorshipAvailable, Robofirm) ]
 [ strnatcmp(SponsorshipAvailable, SponsorshipAvailable) ]
 [ strnatcmp(Robofirm, SponsorshipAvailable) ]
 BBB <--->
Code Climate
ESP IT
Origin Eight
Robofirm
Community Sponsorship Available!
Platinum sponsorship available!
Silver Sponsorship Available!
Bronze Sponsorship Available!
Gold Sponsorship Available!
Valere
Westwerk
 BBB  <--->