Basic Class update

Start moving all basic class methods into dedicated classes.
Most of them are static and can be direct called.
No need to group them into one big class that is hard to maintain and
check.

Work is ongoing

www/lib/CoreLibs/Check/PhpVersion.php

@@ -0,0 +1,55 @@
+<?php declare(strict_types=1);
+
+namespace CoreLibs\Check;
+
+class PhpVersion
+{
+	/**
+	 * checks if running PHP version matches given PHP version (min or max)
+	 * @param  string $min_version minimum version as string (x, x.y, x.y.x)
+	 * @param  string $max_version optional maximum version as string (x, x.y, x.y.x)
+	 * @return bool                true if ok, false if not matching version
+	 */
+	public static function checkPHPVersion(string $min_version, string $max_version = ''): bool
+	{
+		// exit with false if the min/max strings are wrong
+		if (!preg_match("/^\d{1}(\.\d{1})?(\.\d{1,2})?$/", $min_version)) {
+			return false;
+		}
+		// max is only chcked if it is set
+		if ($max_version && !preg_match("/^\d{1}(\.\d{1})?(\.\d{1,2})?$/", $max_version)) {
+			return false;
+		}
+		// split up the version strings to calc the compare number
+		$version = explode('.', $min_version);
+		$min_version = (int)$version[0] * 10000 + (int)($version[1] ?? 0) * 100 + (int)($version[2] ?? 0);
+		if ($max_version) {
+			$version = explode('.', $max_version);
+			$max_version = (int)$version[0] * 10000 + (int)($version[1] ?? 0) * 100 + (int)($version[2] ?? 0);
+			// drop out if min is bigger max, equal size is okay, that would be only THIS
+			if ($min_version > $max_version) {
+				return false;
+			}
+		}
+		// set the php version id
+		if (!defined('PHP_VERSION_ID')) {
+			$version = explode('.', phpversion());
+			// creates something like 50107
+			define('PHP_VERSION_ID', (int)$version[0] * 10000 + (int)$version[1] * 100 + (int)$version[2]);
+		}
+		// check if matching for version
+		if ($min_version && !$max_version) {
+			if (PHP_VERSION_ID >= $min_version) {
+				return true;
+			}
+		} elseif ($min_version && $max_version) {
+			if (PHP_VERSION_ID >= $min_version && PHP_VERSION_ID <= $max_version) {
+				return true;
+			}
+		}
+		// if no previous return, fail
+		return false;
+	}
+}
+
+// __END__