(PHP 4, PHP 5, PHP 7, PHP 8)
sin — Sine
   sin() returns the sine of the num
   parameter.  The num parameter is in radians.
  
numA value in radians
   The sine of num
  
Örnek 1 sin() example
<?php
// Precision depends on your precision directive
echo sin(deg2rad(60)), PHP_EOL;  //  0.866025403 ...
echo sin(60), PHP_EOL;           // -0.304810621 ...
?>