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

/**
 * Returns the theta of a complex number.
 *   This is the angle in radians from the real axis to the representation of the number in polar coordinates.
 *
 * @param     Complex|mixed    $complex    Complex number or a numeric value.
 * @return    float            The theta value of the complex argument.
 * @throws    Exception        If argument isn't a valid real or complex number.
 */
< function theta($complex)
> function theta($complex): float
{ $complex = Complex::validateComplexArgument($complex); if ($complex->getReal() == 0.0) { if ($complex->isReal()) { return 0.0; } elseif ($complex->getImaginary() < 0.0) { return M_PI / -2; } return M_PI / 2; } elseif ($complex->getReal() > 0.0) { return \atan($complex->getImaginary() / $complex->getReal()); } elseif ($complex->getImaginary() < 0.0) { return -(M_PI - \atan(\abs($complex->getImaginary()) / \abs($complex->getReal()))); } return M_PI - \atan($complex->getImaginary() / \abs($complex->getReal())); }