Mobile app interface programming technology - learn to implement PHP advanced functions

• Function definition and calling method

<code>PHP函数的定义方式：

    <span>1.</span>使用关键字“<span><span>function</span>”开始</span><span>2.</span>函数名可以是字母或下划线开头：<span><span>function</span><span>name</span><span>()</span></span><span>3.</span>在大括号中编写函数体：

    <span><span>function</span><span>name</span><span>()</span></span><span>{
        //函数体
        echo <span>'Eric'</span>;
    }</span>    调用方法为函数名+参数，例如：name();</code>

• Function that returns a value

  Using the return keyword can make the function return a value. It can return any type including arrays and objects. If return is omitted, the default return value is NULL.

<code><span><span><?php</span><span><span>function</span><span>sum</span><span>(<span>$a</span>, <span>$b</span>)</span> {</span><span>return</span><span>$a</span>+<span>$b</span>;
}
<span>//在这里调用函数取得返回值</span><span>/**
 * 初始化数组函数
 */</span><span><span>function</span><span>initArray</span><span>()</span>{</span><span>$arr</span> = <span>array</span>(<span>'o'</span>=><span>'哦'</span>);
    <span>return</span><span>$arr</span>;
}

<span>$s</span> = sum(<span>1</span>,<span>2</span>);
print_r(<span>$s</span>.<span>'<br>'</span>);

<span>$arr</span> = initArray();
print_r(<span>$arr</span>[<span>'o'</span>]);

<span>?></span></span></span></code>

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