Updates to 3rd party libraries

Add Dockerfile and specific docker-php.ini

inc/vendor/markbaker/complex/classes/src/functions/log2.php

@@ -0,0 +1,32 @@
+<?php
+
+/**
+ *
+ * Function code for the complex log2() function
+ *
+ * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
+ * @license    https://opensource.org/licenses/MIT    MIT
+ */
+namespace Complex;
+
+/**
+ * Returns the base-2 logarithm of a complex number.
+ *
+ * @param     Complex|mixed    $complex    Complex number or a numeric value.
+ * @return    Complex          The base-2 logarithm of the complex argument.
+ * @throws    Exception        If argument isn't a valid real or complex number.
+ * @throws    \InvalidArgumentException  If the real and the imaginary parts are both zero
+ */
+function log2($complex)
+{
+    $complex = Complex::validateComplexArgument($complex);
+
+    if (($complex->getReal() == 0.0) && ($complex->getImaginary() == 0.0)) {
+        throw new \InvalidArgumentException();
+    } elseif (($complex->getReal() > 0.0) && ($complex->getImaginary() == 0.0)) {
+        return new Complex(\log($complex->getReal(), 2), 0.0, $complex->getSuffix());
+    }
+
+    return ln($complex)
+        ->multiply(\log(Complex::EULER, 2));
+}