I could be making stuff up) that PHP doesn't actually have such a thing as a true "contiguous block of memory" array, but rather all arrays are implemented as an associative array/hash/map type ...

Advocates: Solar arrays in Fort Edward threaten habitat of large grassland birds Grassland Bird Trust says solar panels will block short-eared owl from winter hunt ...

Simultaneously, solar panels shade plants growing beneath them. Some arrays, including the ones used in our study, move the panels to follow the path of the Sun across the sky.