September 2001
Intermediate to advanced
768 pages
32h 45m
English
Content preview from PHP Functions Essential Reference
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atan
float atan(float x) Returns the calculated arctangent for the given argument.
Returns:
Arctangent as a float
Description:
atan() calculates the arctangent for a single value.
Version:
PHP 3, PHP 4
See also:
acos() asin() atan2() cos() sin() tan()
Example:
Calculate the arctangent for a value
$tan = 10.0; echo "The arctangent of $tan is ", atan($tan); |
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.