PHP pi() Function

The pi() is the important mathematical function of PHP, which is used to solve math problems. It returns the approximation value of PI.

We can use the M_PI constant as results to pi().

Syntax:

Example 1

<?php
echo "By using 'pi()' Function the value of PI : ".(pi());
?>

Output:

By using 'pi()' Function the value of PI : 3.1415926535898

Example 2

<?php
echo "By using 'M_PI' constant the value of PI : ".M_PI_2;
	?>

Output:

By using 'M_PI' constant the value of PI : 1.5707963267949

Example 3

<?php
echo "By using 'M_PI_2' constant the value of PI : ".M_PI_2; //  pi/2 
echo "<br>"."By using 'M_PI_4' constant the value of PI : ".M_PI_4;  //  pi/4
?>

Output:

By using 'M_PI_2' constant the value of PI : 1.5707963267949
By using 'M_PI_4' constant the value of PI : 0.78539816339745

Example 4

<?php
echo "By using 'M_SQRTPI' constant the value of PI : ".M_SQRTPI;   //sqrt(pi)
?>

Output:

By using 'M_SQRTPI' constant the value of PI : 1.7724538509055

Example 5

<?php
echo "By using 'M_2_SQRTPI' constant the value of PI : ".M_2_SQRTPI; // 2/sqrt(pi)
?>

Output:

By using 'M_2_SQRTPI' constant the value of PI : 1.1283791670955

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PHP pi() Function

Syntax:

Example 1

Example 2

Example 3

Example 4

Example 5

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