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PHP Object-Oriented PHP Basics Building a Collection Collection Objects

Ker Sing Tan
Ker Sing Tan
10,572 Points

Return an collection array of house objects whose public properties roof_color OR wall_color

Return an collection array of house objects whose public properties roof_color OR wall_color I am stuck with this challenge. I am not fully understand the concept of "collection array" , any expert can explain using this challenge as example?? Thank you

where are roof_color OR wall_color coming from?