PHP

What is PHP round() function and how to round off the value

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2018 / 05 / 07

float round ( float $val [, int $precision = 0 [, int $mode = PHP_ROUND_HALF_UP ]] );
Returns the rounded value of val to specified precision (number of digits after the decimal point). precision can also be negative or zero (default).

Example #1 round() examples

<?php
  echo round(3.4);         // 3
  echo round(3.5);         // 4
  echo round(3.6);         // 4
  echo round(3.6, 0);      // 4
  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
?>

 

Example #2 mode examples

<?php
  echo round(9.5, 0, PHP_ROUND_HALF_UP);   // 10
  echo round(9.5, 0, PHP_ROUND_HALF_DOWN); // 9
  echo round(9.5, 0, PHP_ROUND_HALF_EVEN); // 10
  echo round(9.5, 0, PHP_ROUND_HALF_ODD);  // 9

  echo round(8.5, 0, PHP_ROUND_HALF_UP);   // 9
  echo round(8.5, 0, PHP_ROUND_HALF_DOWN); // 8
  echo round(8.5, 0, PHP_ROUND_HALF_EVEN); // 8
  echo round(8.5, 0, PHP_ROUND_HALF_ODD);  // 9
?>

 

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