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探究PHP浮点类型取整的使用规则

Jun 13, 2016 am 11:09 AM
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我们在实际的编码中经常会用到取整的需求,今天我们就为大家详细介绍了一些

PHP浮点类型取整之ceil -- 进一法取整
说明
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。

例子 1. ceil() 例子

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php   </span></span></span></li>
<li><span>echo ceil(4.3); // 5   </span></li>
<li class="alt"><span>echo ceil(9.999); // 10   </span></li>
<li>
<span class="tag">?></span><span>   </span>
</li>
<li class="alt"><span> </span></li>
</ol>
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PHP浮点类型取整之floor -- 舍去法取整
说明
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。

例子 1. floor() 例子

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php   </span></span></span></li>
<li><span>echo floor(4.3); // 4   </span></li>
<li class="alt"><span>echo floor(9.999); // 9   </span></li>
<li>
<span class="tag">?></span><span>   </span>
</li>
<li class="alt"><span> </span></li>
</ol>
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PHP浮点类型取整之round -- 对浮点数进行四舍五入
说明
float round ( float val [, int precision] )
返回将 val 根据指定精度 precision(十进制小数点后数字的数目)进行四舍五入的结果。precision 也可以是负数或零(默认值)。

例子 1. round() 例子

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php   </span></span></span></li>
<li><span>echo round(3.4); // 3   </span></li>
<li class="alt"><span>echo round(3.5); // 4   </span></li>
<li><span>echo round(3.6); // 4   </span></li>
<li class="alt"><span>echo round(3.6, 0); // 4   </span></li>
<li><span>echo round(1.95583, 2); // 1.96   </span></li>
<li class="alt"><span>echo round(1241757, -3); // 1242000   </span></li>
<li><span>echo round(5.045, 2); // 5.05   </span></li>
<li class="alt"><span>echo round(5.055, 2); // 5.06   </span></li>
<li>
<span class="tag">?></span><span>   </span>
</li>
<li class="alt"><span> </span></li>
</ol>
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PHP浮点类型取整之intval---对变数转成整数型态

例子intval()

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php   </span></span></span></li>
<li><span>echo intval(4.3); //4   </span></li>
<li class="alt"><span>echo intval(4.6); // 4   </span></li>
<li>
<span class="tag">?></span><span>   </span>
</li>
<li class="alt"><span> </span></li>
</ol>
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希望以上介绍的PHP浮点类型取整的相关函数对大家有所帮助。


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