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<?php $array = [ '215/75R17.5', '235/75R17.5', '8.25R16', '7.00R16', '11R22.5', '7.50R16' ]; array_multisort(array_map(fn($v) => strpbrk($v, 'R'), $array), SORT_NATURAL, $array); var_export($array);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => '7.00R16', 1 => '7.50R16', 2 => '8.25R16', 3 => '215/75R17.5', 4 => '235/75R17.5', 5 => '11R22.5', )

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