PHP decimal rounding example tutorial

Content of this section:
How to round decimals in php and js

The first part:

1, discard the decimal part and keep the integer part

Copy codeCode example:

php: intval(7/2)
js:parseInt(7/2)

2, round up, if there is a decimal, add 1 to the integer part

Copy codeCode example:

php: ceil(7/2)
js: Math.ceil(7/2)

3, round down.

Copy codeCode example:

php: round(7/2)
js: Math.round(7/2)

4, round down

Copy codeCode example:

php: floor(7/2)
js: Math.floor(7/2)

Part 2, PHP roundingCommonly used functions
In phpProgramming, the commonly used rounding functions are ceil, floor, round, intval .

Let’s introduce them separately.

1, ceil -- rounding method

Introduction
float ceil (float value)

Return not less than =noted id =note_temp>value is the next integer. If value has a decimal part, it will be carried. The return type of ceil() is still float. The float value range is usually larger than eger.

Example 1. ceil

Copy code code example:

<?php
echo ceil(4.3);     // 5
echo ceil(9.999);     // 10
?>

2, floor -- rounding by rounding off method

Introduction

float floor ( float value )

Return the next integer not greater than value will be value as a decimal Partial rounding and rounding floor return type is still float float value range is usually larger than eger

Example 1. floor

Copy code code example:

<?php
echo floor(4.3);     // 4
echo floor(9.999); // 9
?>

3, round -- round floating point numbers by 4 and 5

Introduction

float round (float val [, precision])

Return val according to Specify precision (the number of digits after the decimal point) to round the result precision. It can also be a negative number or zero (default value)

Example 1. round

Copy code code example :

<?php
echo round(3.4); // 3
echo round(3.5); // 4
echo round(3.6);// 4
echo round(3.6, 0);// 4 
// www.jbxue.com
echo round(1.95583, 2); // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2); // 5.05
echo round(5.055, 2); // 5.06
?>

4, val---convert the variable into an integer type
Example 1, val

Copy code code example:

<?phpecho val(4.3);    //4echo val(4.6); // 4  
?>

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