php 计算多维数组中所有值的总和
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 style="color: #008080;">1</span> <span style="color: #0000ff;">function</span> get_sum(<span style="color: #800080;">$array</span><span style="color: #000000;">) {</span><span style="color: #008080;">2</span> <span style="color: #800080;">$num</span> = 0<span style="color: #000000;">;</span><span style="color: #008080;">3</span> <span style="color: #0000ff;">foreach</span>(<span style="color: #800080;">$array</span> <span style="color: #0000ff;">as</span> <span style="color: #800080;">$k</span> => <span style="color: #800080;">$v</span><span style="color: #000000;">) {</span><span style="color: #008080;">4</span> <span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_array</span>(<span style="color: #800080;">$v</span><span style="color: #000000;">)) {</span><span style="color: #008080;">5</span> <span style="color: #800080;">$num</span> += get_sum(<span style="color: #800080;">$v</span><span style="color: #000000;">);</span><span style="color: #008080;">6</span> <span style="color: #000000;"> }</span><span style="color: #008080;">7</span> <span style="color: #000000;"> }</span><span style="color: #008080;">8</span> <span style="color: #0000ff;">return</span> <span style="color: #800080;">$num</span> + <span style="color: #008080;">array_sum</span>(<span style="color: #800080;">$array</span><span style="color: #000000;">);</span><span style="color: #008080;">9</span> }<br><span style="color: #008080;">10</span> get_sum($array);
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