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<?php $array = ["a", "b", "a", "c"]; var_export( array_map( function ($v) { static $lookup = []; $lookup[$v] ??= 0; return $v . ($lookup[$v]++ ?: ''); }, $array ) );
Output for git.master_jit, git.master, rfc.property-hooks
array ( 0 => 'a', 1 => 'b', 2 => 'a1', 3 => 'c', )

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