PHP基本功之ceil,floor,round,intval

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Release: 2016-06-23 13:09:30
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ceil — 进一法取整

float ceil ( float $value )

返回不小于 value 的下一个整数,value 如果有小数部分则进一位。ceil() 返回的类型仍然是 float,因为 float 值的范围通常比 integer 要大。

echo ceil(4,3); //5

echo ceil(9.9); //10

floor — 舍去法取整

float floor ( float $value )

返回不大于 value 的下一个整数,将 value 的小数部分舍去取整。floor() 返回的类型仍然是 float,因为 float 值的范围通常比 integer 要大。

floor() 例子如图:

floor(4.3);//4


echo 'floor(4.3)='.floor(4.3).'<br>';echo 'floor(9.9)='.floor(9.9).'<br>';echo 'ceil(4.3)='.ceil(4.3).'<br>';echo 'ceil(9.9)='.ceil(9.9).'<br>';echo 'round(4.3)='.round(4.3).'<br>';echo 'round(9.9)='.round(9.9).'<br>';exit;
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返回结果:

floor(4.3)=4
floor(9.9)=9
ceil(4.3)=5
ceil(9.9)=10
round(4.3)=4
round(9.9)=10

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