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<?php $arr = [ 'a' => ['e1' => 1, 'e2' => 2, 'e3' => 3], 'b' => ['e4' => 4, 'e5' => 5], 'c' => ['e6' => 6, 'e7' => 7] ]; print_r(array_flip($arr));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/LJVLQ on line 7 Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/LJVLQ on line 7 Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/LJVLQ on line 7 Array ( )

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