Explore the rules for using PHP floating point type rounding

Explore the rules for using PHP floating point type rounding_PHP Tutorial

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Release： 2016-07-15 13:32:33

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We often use rounding requirements in actual coding. Today we will introduce some details to you

PHP floating point type rounding Integer ceil -- rounding to the nearest integer
Explanation
float ceil ( float value )
Returns the next integer that is not less than value. If value has a decimal part, it will be rounded up. The type returned by ceil() is still float because the range of float values is usually larger than that of integer.

Example 1. ceil() Example

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><</span><span> ?php   </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></span></li>
<li class="alt"><span> </span></li>
</ol>

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PHP floating point type rounding floor -- Rounding by rounding method
Explanation
float floor (float value)
Returns the next integer that is not greater than value, and rounds the decimal part of value. The type returned by floor() is still float because the range of float values is usually larger than that of integer.

Example 1. floor() Example

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><</span><span> ?php   </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></span></li>
<li class="alt"><span> </span></li>
</ol>

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PHP floating point type round -- for floating point numbers Rounding
Description
float round (float val [, int precision])
Returns the result of rounding val according to the specified precision (the number of decimal digits after the decimal point). precision can also be negative or zero (default).

Example 1. round() example

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><</span><span> ?php   </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></span></li>
<li class="alt"><span> </span></li>
</ol>

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PHP floating point type rounding intval---for variables Convert to integer type

Example intval()

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><</span><span> ?php   </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></span></li>
<li class="alt"><span> </span></li>
</ol>

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Hope the above-mentioned functions related to rounding of PHP floating point types will be useful to everyone help.