クリックしてしまいました。違います。月を12月まで調整しただけですが、年はそのままです。

Question

<style>

table{background:#99ffcc;}

th{font-family:隶书;color:#0099ff;}

#tr1{背景:#00ccff;}

.td1{color:blue;}

a{color:#ff9900;}

</style>

<?php

// error_reporting(E_ALL & ~E_NOTICE);

$mon = date("m");

$year = date("Y ");

$year = isset($_GET['y'])?$_GET['y']:$year;

echo $_GET['y'];

echo $year;

$mon = isset($_GET['m'])?$_GET['m']:$mon;

$day = 日付("t",mktime(0,0,0,$mon,1,$year));

$w = date("w",mktime(0,0,0,$mon,1) ,$year));

echo "<div align='center'><table border=0>" ;

echo "<h3><div>{$year}年{$mon}月</div></h3>";

echo "<tr>";

echo "<th class='td1'>日</th>";

echo "<th class='td1'>一</th>";

echo "<th class='td1'>二</th>";

echo "<th class='td1'>三</th>";

echo "<th class='td1'>四</th> ";

echo "<th class='td1'>五</th>";

echo "<th class='td1'>六</ th>";

echo "</tr>";

$d = 1;

while ($d<=$day){

echo "<tr>";

for ($i=1;$i<=7;$i ){

if(($d<=$day) && ($w<$i|| $d!=1)){

echo "<th><a href='#'>{$d}</a></ th>";

$d ;

}else{

echo "<th> </th>";

}

}

echo "</tr>";

}

$prem = $nextm = $mon;

$prey = $nexty = $year;

if ($mon<=1){

$prem = 12;

$prey--;

}else {

$prem--;

}

if ($mon>=12){

$nextm = 1;

$nexty ;

}else {

$nextm ;

}

$prey = $year - 1;

$nexty = $year 1;

echo "<tr>";

echo "<tdcolspan=7 align='center'>";

echo "<a href='index.php?y={$prey}'><< ;</a>";

echo "{$year}年";

echo "<a href='index.php?y={$nexty}'> >></a>";

echo " ";

echo "<a href='index.php?m={$prem}'>< </a>";

echo "{$mon}月";

echo "<a href='index.php?m={$nextm}'>> ;</a>";

echo "</td>";

echo "</tr>";

エコー "</table></div>";