PHP atan2() Function

PHP atan2() is also predefined trigonometry function, which is used to return the arc tangent of two variables x and y or returns the angle theta of different (x,y) points with the atan2() function.

Note: The arc tangent of y/x in radians and between -Pi and Pi.

Syntax:

Parameter	Description	Required/Optional
X	Specify the dividend	Required
Y	Specify the divisor	Required

Example 1

<?php
echo "Your number is : (0.50,0.50)";
echo "<br>"."By using 'atan2()' function your number is :".(atan2(0.50,0.50));
?>

Output:

Your number is : (0.50,0.50)
By using 'atan2()' function your number is :0.78539816339745

Example 2

<?php
echo "Your number is : (-0.50,-0.50)";
echo "<br>"."By using 'atan2()' function your number is :".(atan2(0.50,0.50));
?>

Output:

Your number is : (-0.50,-0.50)
By using 'atan2()' function your number is :0.78539816339745

Example 3

<?php
echo "Your number is : (5,5)";
echo "<br>"."By using 'atan2()' function your number is :".(atan2(5,5));
?>

Output:

Your number is : (5,5)
By using 'atan2()' function your number is :0.78539816339745

Example 4

<?php
echo "Your number is : (-5,-5)";
echo "<br>"."By using 'atan2()' function your number is :".(atan2(-5,-5));
?>

Output:

Your number is : (-5,-5)
By using 'atan2()' function your number is :-2.3561944901923

Example 5

<?php
echo "Your number is : (-5,5)";
echo "<br>"."By using 'atan2()' function your number is :".(atan2(-5,5));
?>

Output:

Your number is : (-5,5)
By using 'atan2()' function your number is :-0.78539816339745

Next TopicPHP Math

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PHP atan2() Function

Note: The arc tangent of y/x in radians and between -Pi and Pi.

Syntax:

Example 1

Example 2

Example 3

Example 4

Example 5

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