Php/docs/function.sqrt

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sqrt

(PHP 4, PHP 5, PHP 7)

sqrtSquare root


Description

sqrt ( float $arg ) : float

Returns the square root of arg.


Parameters

arg
The argument to process


Return Values

The square root of arg or the special value NAN for negative numbers.


Examples

Example #1 sqrt() example

<?php// Precision depends on your precision directiveecho sqrt(9); // 3echo sqrt(10); // 3.16227766 ...?>

See Also

  • pow() - Exponential expression