Open In App

PHP atan2( ) Function

Last Updated : 22 Jun, 2023
Comments
Improve
Suggest changes
Like Article
Like
Report
The atan2() function is a builtin function in PHP and is used to calculate the arc tangent of two variables x and y passed to it as arguments. The function returns the result in radians, which is between -Pi and Pi (inclusive). Syntax: 
float atan2($y, $x)
Parameters: This function accepts two parameters and are described below:
  1. $y: This parameter specifies the dividend.
  2. $x: This parameter specifies the divisor.
Return Value: It returns a float value which is the arc tangent of y/x in radians. Examples: 
Input : atan2(0.50, 0.50)
Output : 0.78539816339745

Input : atan2(-0.50, -0.50)
Output : -2.3561944901923

Input : atan2(5, 5) 
Output : 0.78539816339745

Input : atan2(10, 20) 
Output : 0.46364760900081
Below programs, taking different values of the parameters are used to illustrate the atan2() function in PHP:
  • When (0.50, 0.50) is passed as a parameter: PHP 
    <?php

echo (atan2(0.50, 0.50));

?>
    Output: 
    0.78539816339745
  • When (-0.50, -0.50) is passed as a parameter: PHP 
    <?php

echo (atan2(-0.50, -0.50));

?>
    Output: 
    -2.3561944901923
  • When (5, 5) is passed as a parameter: PHP 
    <?php

echo (atan2(5, 5));

?>
    Output: 
    0.78539816339745
  • When (10, 20) is passed as a parameter: PHP 
    <?php

echo (atan2(10, 20));

?>
    Output: 
    0.46364760900081
    • Reference: https://www.php.net/manual/en/function.atan2.php

    S

    Shubrodeep Banerjee
    Improve
    Article Tags :

Explore

Lightbox