What is the rounding function in php

In PHP, the rounding function is the round() function, which can round floating point numbers; the syntax format is "round(number)", and the parameter number specifies the value to be rounded and cannot be omitted .

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

In PHP, the rounding function is round ()function.

Let’s take a look at an example:

<?php
echo(round(0.60) . "<br>");
echo(round(0.50) . "<br>");
echo(round(0.49) . "<br>");
echo(round(-4.40) . "<br>");
echo(round(-4.60));
?>

Output:

1
1
0
-4
-5

Explanation:

##round () function rounds floating point numbers.

Basic syntax:

round(number,precision,mode);

ParametersDescriptionRequired. Specifies the value to be rounded. Optional. Specifies the number of digits after the decimal point. Default is 0, can also be negative. Optional. Specifies a constant representing the rounding mode:

number
precision
mode	PHP_ROUND_HALF_UP - Default. Round up number to precision decimal places when encountering .5. Rounds 1.5 to 2 and -1.5 to -2. PHP_ROUND_HALF_DOWN - Round down number to precision decimal places when encountering .5. Rounds 1.5 to 1 and -1.5 to -1. PHP_ROUND_HALF_EVEN - When encountering .5, take the next even value and round number to precision decimal places. PHP_ROUND_HALF_ODD - Rounds the next odd value when encountering .5 number to precision decimal places.

Example:

<?php
echo(round(0.5) . "<br>");
echo(round(0.495,1) . "<br>");
echo(round(0.495,2,PHP_ROUND_HALF_DOWN) . "<br>");
echo(round(-4.405,2) . "<br>");
?>

Output:

1
0.5
0.49
-4.41

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