PHP sqrt() Function – Returns the Square Root
The PHP sqrt() function returns the square root of a given float argument, returning NaN for negative inputs; the documentation details its syntax, parameter description, return value, and provides example code demonstrating usage with numbers like 9 and 10.
The sqrt() function in PHP calculates the square root of a floating‑point number.
Syntax : float sqrt(float $arg) Parameter $arg: the number whose square root is to be computed.
Return value : the square root of $arg; if $arg is negative, the function returns NAN.
Example :
<?php
// Precision depends on your precision directive
echo sqrt(9); // 3
echo sqrt(10); // 3.16227766 ...
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