可以计算任意时间差的函数

<?
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function diff($day1,$day2)
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{
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$a=explode("-",$day1);
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$b=explode("-",$day2);
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if(checkdate($a[1],$a[2],$a[0]) && checkdate($b[1],$b[2],$b[0]))
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{
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$c=mktime(0,0,0,$a[1],$a[2],$a[0]);
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$d=mktime(0,0,0,$b[1],$b[2],$b[0]);
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$f=($d-$c)/3600/24;
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echo "$day1 和 $day2 之间相差 $f 天!";
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}
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else
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{
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print "对不起，你的日期格式不对!";
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}
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}
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//用法
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diff("2001-1-1","2001-3-1");
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?>
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