PHP atan() Function

PHP atan() function is used to solve the trigonometry problems. It returns arc tangent of arg as a numeric value between Pi/2 and pi/2 radians.

Syntax:

Parameter	Description	Required/Optional
arg	Specify an argument to process.	Required

Example 1

<?php
$num=(0.5);
echo "Passing number is :".$num;
echo "<br>"."By using 'atan()' function your number is :".(atan($num));
?>

Output:

Passing number is :0.5
By using 'atan()' function your number is :0.46364760900081

Example 2

<?php
$num=(-0.50);
echo "Passing number is :".$num;
echo "<br>"."By using 'atan()' function your number is :".(atan($num));
?>

Output:

Passing number is :-0.5
By using 'atan()' function your number is :-0.46364760900081

Example 3

<?php
$num=5;
echo "Your passing number is :".$num;
echo "<br>"."By using 'atan()' function your number is :".(atan($num));
?>

Output:

Your passing number is :5
By using 'atan()' function your number is :1.373400766945

Example 4

<?php
$num=(-5);
echo "Your passing number is :".$num;
echo "<br>"."By using 'atan()' function your number is :".(atan($num));
?>

Output:

Your passing number is :-5
By using 'atan()' function your number is :-1.373400766945

Example 5

<?php
$num=200;
echo "Your passing number is :".$num;
echo "<br>"."By using 'atan()' function your number is :".(atan($num));
?>

Output:

Your passing number is :200
By using 'atan()' function your number is :1.5657963684609

Example 6

<?php
$num=-200;
echo "Your passing number is :".$num;
echo "<br>"."By using 'atan()' function your number is :".(atan($num));
?>

Output:

Your passing number is :-200
By using 'atan()' function your number is :-1.5657963684609

Example 7

<?php
$num=(3*pi()/2);
echo "passing number (3*pi()/2) is: ".$num;
echo "<br>"."By using 'atan()' function your number is :".(atan($num));
?>

Output:

passing number (3*pi()/2) is: 4.7123889803847
By using 'atan()' function your number is :1.3616916829712

Next TopicPHP Math

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PHP atan() Function

Syntax:

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

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