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  • Bug fixes for general core bugs in 3.11.x will end 14 Nov 2022 (12 months plus 6 months extension).
  • Bug fixes for security issues in 3.11.x will end 13 Nov 2023 (18 months plus 12 months extension).
  • PHP version: minimum PHP 7.3.0 Note: minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is supported too.
<?php

/**
 *
 * Function code for the complex sqrt() function
 *
 * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
 * @license    https://opensource.org/licenses/MIT    MIT
 */
namespace Complex;

/**
 * Returns the square root of a complex number.
 *
 * @param     Complex|mixed    $complex    Complex number or a numeric value.
 * @return    Complex          The Square root of the complex argument.
 * @throws    Exception        If argument isn't a valid real or complex number.
 */
< function sqrt($complex)
> function sqrt($complex): Complex
{ $complex = Complex::validateComplexArgument($complex); $theta = theta($complex); $delta1 = \cos($theta / 2); $delta2 = \sin($theta / 2); $rho = \sqrt(rho($complex)); return new Complex($delta1 * $rho, $delta2 * $rho, $complex->getSuffix()); }