05c06-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 41 行

<?php
// A function to find the maximum value from a multidimensional array:
function recursive_array_max($a) {
    // Loop through all entries comparing them to each other
    foreach ($a as $value) {
        // If this is an array find its maximum.
        if (is_array($value)) {
            $value = recursive_array_max($value);
        }
        
        // Now if this is our first value:
        if (!(isset($max))) {
            // Store this and move on:
            $max = $value;
        } else {
            // Compare this value to the max, and pick the highest:
            $max = $value > $max ? $value : $max;
        }
    }
    
    // Return the final maximum value:
    return $max;
}
        
// Prepare a multidimensional array of numbers:
$dimensional = array(
    57,
    array(3, 35),
    array(235, 534, 73, array(3, 4, 956), 6),
    14, 
    2, 
    array(5, 74, 73)
    );

// Find the maximum value within this:
$max = recursive_array_max($dimensional);

// Print out the result: It will be 956
echo "<p>The maximum value was: {$max}</p>";
?>