公历闰年判定遵循的规律为：四年一闰，百年不闰，四百年再闰。
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$year=1900;
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if(($year%4 == 0 && $year%100 != 0) || ($year%400 == 0 )) {
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echo "$year is run yerar.
";
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}else {
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echo "$year is ping year.
";
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}
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$a=10;
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$b=$a++ + ++$a;
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echo $a."
";
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echo $b."
";
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?>
输出:
10
22
原因:
左自增比右自增优先级高,所以是$b=$a + (++(++$a))=10+12=22
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