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Math Functions

PHP provides nearly fifty functions that can perform various mathematical functions. Combined with mathematical operators, they can make your homework a lot easier!

The simplest math functions are those that only require a single parameter. This parameter is usually a number, which is accepted either as a variable or a string. The ceil() function, for example, will return a number rounded up to the nearest full number.

<?php
  $num = 55;
  echo ceil($num);
  // Result Will Be: 55

  $result = ceil(295.34);
  echo $result;
  // Result Will Be: 296
?>

As you can see, the results of these functions can be echoed, stored in a variable, etc.

Some math functions accept multiple parameters. The rand() function, for example, generates a random number in between the two numbers that it is given. Multiple parameter are separated by commas.

<?php
  echo rand(0, 500);
  // Result Is: 482
?>

If you refresh the page, you will see the above result change each time to a random number between 0 and 500.

Below is a list of almost twenty useful math functions, along with a brief description and required parameters.

Function(Parameters) Description
rand(min_number, max_number) Returns a Random Integer
ceil(number) Returns the Value of a Number Rounded Upwards to the Nearest Integer
floor(number) Returns the Value of a Number Rounded Downwards to the Nearest Integer
abs(number) Returns the Absolute Value of a Number
base_convert(number) Converts a Number From One Base to Another
bindec(binary_number) Converts a Binary Number to a Decimal Number
decbin(decimal_number) Converts a Decimal Number to a Binary Number
dechex(decimal_number) Converts a Decimal Number to a Hexadecimal Number
decoct(decimal_number) Converts a Decimal Number to an Octal Number
fmod(number, divisor) Returns the Remainder (Modulo) of the Division of the Arguments
hexdec(hex_number) Converts a Hexadecimal Number to a Decimal Number
is_finite(number) Returns True if a Value is a Finite Number
is_infinite(number) Returns True if a Value is an Infinite Number
is_nan(value_to_check) Returns True if a Value is Not a Number
max(number1, number2) Returns the Number With the Highest Value of Two Specified Numbers
min(number1, number2) Returns the Number With the Lowest Value of Two Specified Numbers
pi() Returns the Value of PI
pow(x, y) Returns the Value of "x" to the Power of "y"
round(number, optional) Rounds a Number to the Nearest Integer (Number of Digits After Decimal Point Optional)
sqrt(number) Returns the Square Root of a Number

A complete list of the math functions available can be found in the official PHP manual. Each function includes examples that will help you understand how to use it.