php 内置函数 array_sum() 函数返回数组中所有值的总和，只能返回一维数组的总和；
计算多维数组所有值的和就要自定义函数了；
<span>1</span> <span>function</span> get_sum(<span>$array</span><span>) {
</span><span>2</span> <span>$num</span> = 0<span>;
</span><span>3</span> <span>foreach</span>(<span>$array</span> <span>as</span> <span>$k</span> => <span>$v</span><span>) {
</span><span>4</span> <span>if</span>(<span>is_array</span>(<span>$v</span><span>)) {
</span><span>5</span> <span>$num</span> += get_sum(<span>$v</span><span>);
</span><span>6</span> <span> }
</span><span>7</span> <span> }
</span><span>8</span> <span>return</span> <span>$num</span> + <span>array_sum</span>(<span>$array</span><span>);
</span><span>9</span> }<br /><span>10</span> get_sum($array);
<span> </span>
