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<?php $array = [ 'list[P] = 1', 'list[A] = 1', 'list[F] = 2', 'list[B] = 1' ]; usort( $array, fn($a, $b) => strpbrk($a, '0123456789') <=> strpbrk($b, '0123456789') ); var_export($array);
Output for git.master, git.master_jit
array ( 0 => 'list[P] = 1', 1 => 'list[A] = 1', 2 => 'list[B] = 1', 3 => 'list[F] = 2', )

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