PHP - 日付と時刻の取り扱い(日付と時刻のselectメニューの処理)

『初めてのPHP5』
David Sklar 著 桑村 潤 廣川 類 翻訳

開発環境

• OS X Lion - Apple(OS)
• Apache (Web Server)
• PHP (サーバーサイドプログラミング言語、スクリプト言語)
• BBEdit - Bare Bones Software, Inc.(Text Editor)

『初めてのPHP5』 (David Sklar 著、 桑村 潤 翻訳、 廣川 類 翻訳、 オライリー・ジャパン、2005年、ISBN978-4-87311-257-2)の9章(日付と時刻の取り扱い)9.6(演習問題)4を解いてみる。

4.

HTML、PHPのソースコード(BBEdit)

sample107.php

<?php
  require 'formhelpers.php';
  $time = mktime(0,0,0,12,32,2000);
  $years = array();
  for($year = date('Y'); $year < date('Y') + 100; $year++){
    $years[$year] = $year;
  }
  $months = array( 1 => "Jan", 2 => "Feb", 3 => "Mar", 4 => "Apr",
                   5 => "May", 6 => "Jun", 7 => "Jul", 8 => "Aug",
                   9 => "Sep", 10 => "Oct", 11 => "Nov", 12 => "Dec");
  $days = array();
  for($day = 1; $day <= 31; $day++){
    $days[$day] = $day;
  }
  if(array_key_exists('_submit_check', $_POST)){
    process_form();
  } else {
    show_form();
  }
  function show_form(){
    global $years, $months, $days;
    if(array_key_exists('_submit_check', $_POST)){
      $defaults = $_POST;
    } else {
      $timestamp = strtotime('+1 month');
      $defaults = array('year' => date('Y', $timestamp),
                       'month' => date('m', $timestamp),
                       'day' => date('d', $timestamp));
    }
    print '<form method="POST" action="' . $_SERVER['PHP_SELF'] . '" >';
    print "Year: ";
    input_select("year", $defaults, $years);
    print "Month: ";
    input_select("month", $defaults, $months);
    print "Day: ";
    input_select("day", $defaults, $days);
    
    input_submit('submit', 'submit');
    print '<input type="hidden" name="_submit_check" value="1" />';
    print '</form>';
  }
  function process_form(){
    $future = mktime(0,0,0,$_POST['month'], $_POST['day'], $_POST['year']);
    $tuesday = strtotime('tuesday');
    print '今日から' . date('Y-m-d', $future) . 'までの火曜日の日付一覧<br />';
    while($tuesday <= $future){
      print date('Y-m-d', $tuesday) . '<br />';
      $tuesday = strtotime('+1 week', $tuesday);
    }
    print '<a href="' . $_SERVER['PHP_SELF'] . '">戻る</a>';
  }
?>