ChristmasTree.php

<?php
/**
 * Draws a christmas tree
 *
 * Author: Fabian Dennler
 */

$repeat = 3;                      // Amount of stages

print("Zeichen: ");
fscanf(STDIN, "%s", $character);  // Character to use for drawing
print("Höhe: ");
fscanf(STDIN, "%d", $width);      // Maximum width of tree

$output[0] = 1;                   // Tree top is always 1 character
$index = 1;                       // Index of tree row

// Prepare the tree stage
// Every row increment last row by 2
for ($i = $index; $i < intval($width); $i++) {
    $output[$i] = $output[$i - 1] + 2;
}

// Amount of character of the last row
$max = $output[sizeof($output) - 1];

// Draw the tree stages
for ($i = 0; $i < $repeat; $i++) {
    foreach ($output as $key => $value) {
        tree($value, $max, $character);
    }
}

// Draw the tree trunk
tree(3, $max, $character);
tree(3, $max, $character);
tree(3, $max, $character);

/**
 * Draws the tree stage
 *
 * @param   $value  Amount of character in the row
 * @param   $max    Width of tree
 */
function tree($value, $max, $character) {
    $spaces = 0.5 * ($max - $value);
    // Draw the indent of this row
    for ($k = 0; $k <= $spaces; $k++) {
        print(" ");
    }
    // Draw the character of this row
    for($k = 0; $k < $value; $k++) {
        print($character);
    }
    print(chr(10));
}