The following two statements are functionally identical. The bcpowmod() version however, executes in less time and can accept larger parameters.

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deg2rad() function
The deg2rad() function converts a degree to its radian number.


Syntax

deg2rad(degree_number)

Example 1

<?php
echo deg2rad("30") . "<br />";
echo deg2rad("10") . "<br />";
echo deg2rad("1587") . "<br />";
echo deg2rad("70");
?>

The output of the code above will be:

0.523598775598
0.174532925199
27.6983752292
1.2217304764

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Hi,
To Set default scale parameter for all bc math functions we can use bcscale() function. This function sets the default scale parameter for all subsequent bc math functions that do not explicitly specify a scale parameter.

For e.g

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To get the square root of an arbitrary precision number we can use bcsqrt() function

For example

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To subtract one arbitrary precision number from another we can use bcsub()

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The atan() function returns the arctangent of a number as a numeric value between -PI/2 and PI/2 radians.

<?php
echo(atan(0.50) . "<br />");
echo(atan(-0.50) . "<br />");
echo(atan(5) . "<br />");
echo(atan(10) . "<br />");
echo(atan(-5) . "<br />");
echo(atan(-10))
?>

ans:

0.463647609001
-0.463647609001
1.37340076695
1.4711276743
-1.37340076695
-1.4711276743

The atan2() function returns the angle theta of an (x,y) point as a numeric value between -PI and PI radians.

<?php
echo(atan2(0.50,0.50) . "<br />");
echo(atan2(-0.50,-0.50) . "<br />");
echo(atan2(5,5) . "<br />");
echo(atan2(10,20) . "<br />");
echo(atan2(-5,-5) . "<br />");
echo(atan2(-10,10))
?>

ans
0.785398163397
-2.35619449019
0.785398163397
0.463647609001
-2.35619449019
-0.785398163397

Hi,

mt_srand() Definition and Usage

The mt_srand() function seeds the random number generator for mt_rand().

This function should be called only once per script, and it must be called before any calls to mt_rand().

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Senraj.A

Hi,

In this example we will seed the random number generator:

The output of the code above could be:

1132656473

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Hi,

mt_srand()

Note: In PHP 4.2.0 and later, there is no need to seed the random generator with mt_srand(). This is done automatically.

Tip: The greater the randomness of the seed, the more random number you'll get. A suitable number to seed this function with, is mktime().

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Math functions will handle values in the range of the integer and float types.
These are predefined functions within library.

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Hi,
How we can use these functions effectively in PHP scripts?

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Hi,

The pow() Definition and Usage

function raises the first argument to the power of the second argument, and returns the result.

Example

The output of the code above will be:

16
36
36
0.0277777777778
-1.#IND

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Nice one examples buddy.

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Hi,
These mathematical functions are used to create arithmetical calculation and logic in a web page.

For example while generating the reports of anything, there we can go for these functions.

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Hi,

pi() Definition and Usage

The pi() function returns the value of PI.

Example

The output of the code above will be:

3.14159265359

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<?php
$oct = "0031";
$dec = base_convert($oct,8,10);
echo "$oct in octal is equal to $dec in decimal.";
?>

output

0031 in octal is equal to 25 in decimal.

The lcg_value() function returns a pseudo random number in the range of 0 and 1.

<?php
echo lcg_value();
?>

The output of the code above could be:

0.408212029326

The mt_rand() function returns a random integer using the Mersenne Twister algorithm.

If this function is called without parameters, it returns a pseudo-random value between 0 and RAND_MAX.

If you want a random number between 10 and 100 (inclusive), use mt_rand (10,100).

<?php
echo(mt_rand() . "<br />");
echo(mt_rand() . "<br />");
echo(mt_rand(10,100))
?>

The output of the code above could be:

1150905288
613289478
21

The rad2deg() function converts a radian number to its degree.

<?php
$rad = M_PI;
$deg = rad2deg($rad);
echo "$rad radians is equal to $deg degrees";
?>

The output of the code above will be:

3.14159265359 radians is equal to 180 degrees