How to implement division and rounding of two numbers in PHP

php method to realize division and rounding of two numbers: 1. Use the "/" operator to perform division operation, the syntax is "value 1 / value 2"; 2. Use the rounding functions intval(), round( ), ceil() or floor() just round the result of the division operation.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php implements the division of two numbers The whole number can be divided into two parts:

• Dividing two numbers: You can use the "/" operator to perform division operation

• Rounding: You can use the rounding function to round the result of the division operation

There are four commonly used methods of PHP rounding function:

• Round directly, discard decimals, keep integers: intval();

• Round to integers: round();

• Round up Integer, if there are decimals, add 1: ceil();

• Round down to integer: floor().

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$a=10;
$b=3;
$c=$a/$b;
echo "两数相除的结果：".$c;
echo "<br>使用intval()取整：".intval($c);
echo "<br>使用round()取整：".round($c);
echo "<br>使用ceil()取整：".ceil($c);
echo "<br>使用floor()取整：".floor($c);
?>

##Expand knowledge: understand ceil, floor, round, intval functions

1. intval—convert the variable into an integer type

If intval is a character type, it will be automatically converted to 0.

intval(3.14159);  // 3
intval(3.64159);  // 3
intval('ruesin'); //0

2. Rounding: round()

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

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

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.

ceil(3.14159);  // 4
ceil(3.64159);  // 4

4. Round down: floor()

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

floor(3.14159);    // 3
floor(3.64159);    // 3

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