<?php $array = [ '215/75R17.5', '235/75R17.5', '8.25R16', '7.00R16', '11R22.5', '7.50R16' ]; array_multisort(array_map(fn($v) => sscanf($v, '%*[^R]R%f')[0], $array), $array); var_export($array);
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