PHP 在数组中加法运算操作实例代码 $a = array("a" => "apple", "b" => "banana"); $b = array("a" => "pear", "b" => "strawberry", "c" => "cherry"); $c = $a $b; // Union of $a and $b echo "Union of $a and $b: "; var_dump($c); $c = $b $a; // Union of $b and $a echo "Union of $b and $a: "; var_dump($c); ?> array(3) { ["a"]=> string(5) "apple" ["b"]=> string(6) "banana" ["c"]=> string(6) "cherry" } Union of $b and $a: array(3) { ["a"]=> string(4) "pear" ["b"]=> string(10) "strawberry" ["c"]=> string(6) "cherry" } ?>