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PHP取整函数的具体使用方法介绍

Jun 13, 2016 am 11:08 AM
ceil float php introduce Instructions specific function Function Rounding powerful of illustrate

对于功能强大的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。

PHP取整函数例子 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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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。

PHP取整函数例子 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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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)。

PHP取整函数例子 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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intval---对变数转成整数型态

PHP取整函数例子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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