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首先来看看键名是 string,两者区别:<?php $arr1 = array('a'=>'PHP'); $arr2 = array('a'=>'PYTHON'); print_r(array_merge($arr1,$arr2)); //Array ( [a] => PYTHON ) 如果键名为字符,且键名相同,array_merge()后面数组元素值会覆盖前面数...