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round() function in PHP
The round() function rounds a floating point number. For example, 0.90 to 1, 0.35 to 0, etc.
Syntax
round(val, precision, mode)
Parameters
val − The value to round
precision − It sets the precision i.e. the number of decimal digits to round to
mode − A constant that specify the following rounding mode
PHP_ROUND_HALF_UP - The constant rounds val up to precision decimal, when it is half way there. Rounds 1.5 to 2 and -1.5 to -2. Default
PHP_ROUND_HALF_DOWN - The constant rounds val down to precision decimal places, when it is half way there. Rounds 1.5 to 1 and -1.5 to -1
PHP_ROUND_HALF_EVEN - It rounds val to precision decimal places towards the next even value
PHP_ROUND_HALF_ODD - It rounds val to precision decimal places towards the next odd value.
Return
The round() function Returns the rounded value.
Example
<?php echo(round(2.099,2)); ?>
Output
2.1
Example
Let us see another example −
<?php echo(round(9.859,2)); ?>
Output
9.86
Example
Let us see another example −
<?php echo(round(10.5,0,PHP_ROUND_HALF_UP) . "<br>"); echo(round(-10.5,0,PHP_ROUND_HALF_UP) ); ?>
Output
11<br>-11
Example
Let us see another example −
<?php echo(round(19.5,0,PHP_ROUND_HALF_DOWN) . "<br>"); echo(round(-19.5,0,PHP_ROUND_HALF_DOWN) . "<br>"); ?>
Output
19<br>-19<br>
Example
Let us see another example −
<?php echo(round(9.9,0,PHP_ROUND_HALF_EVEN) . "<br>"); echo(round(-9.8,0,PHP_ROUND_HALF_EVEN) . "<br>"); echo(round(11.8,0,PHP_ROUND_HALF_ODD) . "<br>"); echo(round(-11.8,0,PHP_ROUND_HALF_ODD)); ?>
Output
10<br>-10<br>12<br>-12
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