# Inbuilt Arithmetic Functions in PHP

PHP have some inbuilt mathematical functions for calculations. They are

# abs() — This function returns the absolute value of a number
# acos() — Using for to find arccosine of a number
# acosh() — helps to Inverse hyperbolic cosine
# asin() — Using for to get Arc sine
# asinh() — Inverse hyperbolic sine
# atan2() — Arc tangent of two variables
# atan() — Using for to get Arc tangent
# atanh() — Inverse hyperbolic tangent
# base_convert() — Convert a number between arbitrary bases
# bindec() — Using for Binary to decimal
# ceil() — Returns the value of a number rounded upwards to the nearest integer
# cos() — Returns the cosine of a number
# cosh() — Hyperbolic cosine
# decbin() — For convert Decimal to binary
# dechex() — For convert Decimal to hexadecimal
# decoct() — For convert Decimal to octal
# deg2rad() — It Converts the number in degrees to the radian equivalent
# exp() — It Calculates the exponent of e
# expm1() — It Returns exp(number) – 1, computed in a way that is accurate even when the value of number is close to zero
# floor() — Returns the value of a number rounded downwards to the nearest integer
# fmod() — Returns the floating point remainder (modulo) of the division of the arguments
# getrandmax() — Show largest possible random value
# hexdec() — Using for convert Hexadecimal to decimal
# hypot() — Using for to Calculate the length of the hypotenuse of a right-angle triangle
# is_finite() — Finds whether a value is a legal finite number
# is_infinite() — Finds whether a value is infinite
# is_nan() — Finds whether a value is not a number
# lcg_value() — Combined linear congruential generator
# log10() — Base-10 logarithm
# log1p() — Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero
# log() — Natural logarithm
# max() — Find highest value
# min() — Find lowest value
# mt_getrandmax() — Show largest possible random value
# mt_rand() — Generate a better random value
# mt_srand() — Seed the better random number generator
# octdec() — Octal to decimal
# pi() — Get value of pi
# pow() — Exponential expression
# rad2deg() — Converts the radian number to the equivalent number in degrees
# rand() — Generate a random integer
# round() — Rounds a float
# sin() — This function returns the sine of a number
# sinh() — Hyperbolic sine
# sqrt() — To get Square root value of a number
# srand() — Seed the random number generator
# tan() — Tangent value of a number
# tanh() — This function returns Hyperbolic tangent

Round a number, down using the floor function in PHP
<?php
echo floor(3.141586);
?>

Output : 3