06c03-1.php

介绍PHP5的给类型函数应用

<?php
// Define a few functions that echo different strings, based upon whether
//  the number is divisible by a certain other number.
function is_divisible_by_1($num) {
    echo "<p>Of course $num is divisible by 1, everything is!</p>";
}

function is_divisible_by_2($num) {
    if ($num % 2 == 0) {
        echo "<p>$num is divisible by 2.  That means it is even.</p>";
    }
}

function is_divisible_by_3($num) {
    if ($num % 3 == 0) {
        echo "<p>$num is divisible by 3.</p>";
    }
}

function is_divisible_by_4($num) {
    if ($num % 4 == 0) {
        echo "<p>$num is divisible by 4.  It is double-even!</p>";
    }
}

function is_divisible_by_5($num) {
    if ($num % 5 == 0) {
        echo "<p>$num is divisible by 5.  It ends in a 0 or a 5.</p>";
    }
}

// Now, using a loop, going from 5 to 1, see what a given number (2000) is
//  divisible by.  This will be true for all cases except for '3'
for ($i = 5; $i > 0; $i--) {
    // Check for divisibility by calling the appropriate function:
    $var = 'is_divisible_by_' . $i;
    $var(2000);
}
?>