PHP rounding, rounding, rounding up, rounding down, decimal interception. What does rounding mean? Rounding is one hundred million. Excel value rounding

Four commonly used methods for PHP integer functions:

1. Round directly, discard decimals, and keep integers: intval();
2. Rounding: round();
3. Round up and add 1 if there are decimals: ceil();
4. Round down: floor().

1. intval—convert variables into integer types
If intval is a character type, it will be automatically converted to 0.

<code><span>intval(<span>3.14159</span>)</span>;  <span>// 3</span><span>intval(<span>3.64159</span>)</span>;  <span>// 3</span><span>intval(<span>'ruesin'</span>)</span>; <span>//0</span></code>

2. Rounding: round()

Rounds parameter 1 according to the precision specified by parameter 2. Parameter 2 can be negative or zero (default).

<code><span>round</span>(<span>3.14159</span>);      <span>// 3</span><span>round</span>(<span>3.64159</span>);      <span>// 4</span><span>round</span>(<span>3.64159</span>, <span>0</span>);   <span>// 4</span><span>round</span>(<span>3.64159</span>, <span>2</span>);   <span>// 3.64</span><span>round</span>(<span>5.64159</span>, <span>3</span>);   <span>// 3.642</span><span>round</span>(<span>364159</span>, -<span>2</span>);   <span>// 364200</span></code>

3. Round up and add 1 if there is a decimal: ceil()

Returns the next integer that is not less than value. If value has a decimal part, it will be rounded up by one.

This method is often used when we write paging classes to calculate the number of pages.

<code><span>ceil</span>(<span>3.14159</span>);  <span>// 4</span><span>ceil</span>(<span>3.64159</span>);  <span>// 4</span></code>

4. Round down: floor()

Returns the next integer not greater than value, and rounds the decimal part of value.

<code><span>floor</span>(<span>3.14159</span>);    <span>// 3</span><span>floor</span>(<span>3.64159</span>);    <span>// 3</span></code>

Please indicate the source for reprinting: http://blog.csdn.net/churk2012/article/details/51424588

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The above has introduced PHP rounding, rounding, rounding up, rounding down, and decimal interception, including rounding and PHP content. I hope it will be helpful to friends who are interested in PHP tutorials.