PHP Reference
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Quick Reference

The PHP round() function rounds a floating-point number.

<?php
echo(round(0.49));
?>

Output

0

Syntax

round(number, precision, mode)

Parameters

ParameterDescription
numberSpecifies the value to round (required)
precisionSpecifies the number of decimal digits to round to (default is 0)
modeSpecifies a constant to specify the rounding mode:

  • PHP_ROUND_HALF_UP - Rounds number 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 - Round number 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 - Round number to precision decimal places towards the next even value

  • PHP_ROUND_HALF_ODD - Round number to precision decimal places towards the next odd value

PHP Notes:

  • When using PHP, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
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