※このサンプルの解説は、「CGIの扉」をすべて読み終えてる方を前提としています。

【時間関数のテスト】
time = 1327922690
gmtime(time) = Mon Jan 30 11:24:50 2012
gmtime() = Mon Jan 30 11:24:50 2012
gmtime = Mon Jan 30 11:24:50 2012
localtime(time) = Mon Jan 30 20:24:50 2012
localtime() = Mon Jan 30 20:24:50 2012
localtime = Mon Jan 30 20:24:50 2012
(localtime)[$i] = 50 24 20 30 0 112 1 29 0
$year $mon $mday $hour $min $sec = 112 0 30 20 24 50
$fmt0 = "%04d/%02d/%02d %02d:%02d:%02d"
sprintf($fmt0, $year+1900,$mon+1,$mday,$hour,$min,$sec) = 2012/01/30 20:24:50
substr(localtime, 0, 3) = Mon

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