PHP 7.0.26 Released

Math Functions

Table of Contents

  • abs — Absolute value
  • acos — Arc cosine
  • acosh — Inverse hyperbolic cosine
  • asin — Arc sine
  • asinh — Inverse hyperbolic sine
  • atan2 — Arc tangent of two variables
  • atan — Arc tangent
  • atanh — Inverse hyperbolic tangent
  • base_convert — Convert a number between arbitrary bases
  • bindec — Binary to decimal
  • ceil — Round fractions up
  • cos — Cosine
  • cosh — Hyperbolic cosine
  • decbin — Decimal to binary
  • dechex — Decimal to hexadecimal
  • decoct — Decimal to octal
  • deg2rad — Converts the number in degrees to the radian equivalent
  • exp — Calculates the exponent of e
  • expm1 — Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
  • floor — Round fractions down
  • fmod — Returns the floating point remainder (modulo) of the division of the arguments
  • getrandmax — Show largest possible random value
  • hexdec — Hexadecimal to decimal
  • hypot — Calculate the length of the hypotenuse of a right-angle triangle
  • intdiv — Integer division
  • 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 random value via the Mersenne Twister Random Number Generator
  • mt_srand — Seeds the Mersenne Twister 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 — Sine
  • sinh — Hyperbolic sine
  • sqrt — Square root
  • srand — Seed the random number generator
  • tan — Tangent
  • tanh — Hyperbolic tangent
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User Contributed Notes 50 notes

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2
pat.mat AT sympatico DOT com
13 years ago
For people interest in Differential Equations, I've done a function that receive a string like: x^2+x^3 and put it in
2x+3x^2 witch is the differantial of the previous equation.

In the code there is one thing missing: the $string{$i} is often going outOfBound (Uninitialized string offset: 6 in...)
if your error setting is set a little too high... I just dont know how to fix this.

So there is the code for differential equation with (+ and -) only:

<?
function differentiel($equa)
{
   
$equa = strtolower($equa);
    echo
"Equation de depart: ".$equa."<br>";
   
$final = "";
   
    for(
$i = 0; $i < strlen($equa); $i++)
    {
       
//Make a new string from the receive $equa
       
if($equa{$i} == "x" && $equa{$i+1} == "^")
        {
           
$final .= $equa{$i+2};
           
$final .= "x^";
           
$final .= $equa{$i+2}-1;
        }
        elseif(
$equa{$i} == "+" || $equa{$i} == "-")
        {
           
$final .= $equa{$i};
        }
        elseif(
is_numeric($equa{$i}) && $i == 0)
        {
           
//gerer parenthese et autre terme generaux + gerer ^apres: 2^2
           
$final .= $equa{$i}."*";
        }
        elseif(
is_numeric($equa{$i}) && $i > 0 && $equa{$i-1} != "^")
        {
           
//gerer ^apres: 2^2
           
$final .= $equa{$i}."*";
        }
        elseif(
$equa{$i} == "^")
        {
            continue;
        }
        elseif(
is_numeric($equa{$i}) && $equa{$i-1} == "^")
        {
            continue;
        }
        else
        {
            if(
$equa{$i} == "x")
            {
               
$final .= 1;
            }
            else
            {
               
$final .= $equa{$i};
            }
        }
    }
   
//
    //Manage multiplication add in the previous string $final
    //
   
$finalMul = "";
    for(
$i = 0; $i < strlen($final); $i++)
    {
        if(
is_numeric($final{$i}) && $final{$i+1} == "*" && is_numeric($final{$i+2}))
        {
           
$finalMul .= $final{$i}*$final{$i+2};
        }
        elseif(
$final{$i} == "*")
        {
            continue;
        }
        elseif(
is_numeric($final{$i}) && $final{$i+1} != "*" && $final{$i-1} == "*")
        {
            continue;
        }
        else
        {
           
$finalMul .= $final{$i};   
        }
    }
    echo
"equa final: ".$finalMul;
}
?>

I know this is not optimal but i've done this quick :)
If you guys have any comment just email me.
I also want to do this fonction In C to add to phpCore maybe soon...
Patoff
up
1
peter-stangl at t-online dot de
11 years ago
I needed to approximate an integral because i was not able to calculate it, so i wrote this function. It approximates an integral with the composite Simpson's rule.
More information on Simpson's rule: http://en.wikipedia.org/wiki/Simpson%27s_rule

<?php

function simpsonf($x){
// returns f(x) for integral approximation with composite Simpson's rule
  
return(pow((1+pow($x, (-4))), 0.5));
}
function
simpsonsrule($a, $b, $n){
// approximates integral_a_b f(x) dx with composite Simpson's rule with $n intervals
// $n has to be an even number
// f(x) is defined in "function simpsonf($x)"
  
if($n%2==0){
     
$h=($b-$a)/$n;
     
$S=simpsonf($a)+simpsonf($b);
     
$i=1;
      while(
$i <= ($n-1)){
        
$xi=$a+$h*$i;
         if(
$i%2==0){
           
$S=$S+2*simpsonf($xi);
         }
         else{
           
$S=$S+4*simpsonf($xi);
         }
        
$i++;
      }
      return(
$h/3*$S);
      }
   else{
      return(
'$n has to be an even number');
   }
}

?>
up
1
webkid%webkid.com
15 years ago
And the reason I needed a Factorial function is because I there were no nPr or nCr functions native to PHP, either.

function n_pick_r($n,$r){$n=(int)$n; $r=(int)$r;return (fact($n)/fact($n-$r));}
function n_choose_r($n,$r){$n=(int)$n; $r=(int)$r;return (n_pick_r($n,$r)/fact($r));}

Hope that helps someone!
up
1
jbeardsl [found_at] gte [d0t] net
15 years ago
I was looking for a truncate function. Not finding one, I wrote my own. Since it deals with everything as a number, I imagine it's faster than the alternative of using string functions. HTH...

<?php
function truncate ($num, $digits = 0) {

   
//provide the real number, and the number of
    //digits right of the decimal you want to keep.

   
$shift = pow(10, $digits);
    return ((
floor($num * $shift)) / $shift);
}
?>
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