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<?php $a = array(0, 0.5, 1, 1.5); var_dump(array_combine($a, $a));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> int(0) ["0.5"]=> float(0.5) [1]=> int(1) ["1.5"]=> float(1.5) }

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