06c07-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 35 行

<?php
// Define an 'interesting' function that does different math based 
//  on the number of arguments
function interesting() {
    // Read in the number of arguments:
    $args = func_num_args();
    
    // If one argument, square it and return it
    if ($args == 1) {
        $num = func_get_arg(0);
        return $num * $num;
    }
    // If two arguments, multiply them and return it:
    elseif ($args == 2) {
        return func_get_arg(0) * func_get_arg(1);
    }
    // Otherwise, sum up all the values and return them
    else {
        $nums = func_get_args();
        return array_sum($nums);
    }
}

// Try the function in all 3 forms:

// Pass it a 2, and it should return 4
echo '<p>', interesting(2), '</p>';

// Pass it a 2 and a 4, and it should return 8
echo '<p>', interesting(2, 4), '</p>';

// Pass it a 2, 4, 1, and 8, and it will add them to get 15
echo '<p>', interesting(2,4,1,8), '</p>';
?>