PHP基本功之ceil,floor,round,intval
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;
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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