Initial commit

common/functions_system.php

@@ -0,0 +1,54 @@
+<?php
+
+function system_root() {
+    $root = dirname(dirname(__FILE__));
+    return $root;
+}
+
+function system_path($path) {
+    if ( $path[0] === '/' ) {
+        $path = substr($path, 1);
+    }
+
+    return implode('/', [system_root(), $path]);
+}
+
+function require_system($path, $once = true) {
+    if ( $once ) {
+        return require_once system_path($path);
+    } else {
+        return require system_path($path);
+    }
+}
+
+function include_system($path, $once = true) {
+    if ( $once ) {
+        return include_once system_path($path);
+    } else {
+        return include system_path($path);
+    }
+}
+
+function system_url($path) {
+    if ( $path[0] === '/' ) {
+        $path = substr($path, 1);
+    }
+
+    return implode('/', [SYSTEM_URL, $path]);
+}
+
+function system_redirect($path) {
+    header('Location: ' . system_url($path));
+    exit;
+}
+
+function no_direct_access() {
+    $key = array_search(__FUNCTION__, array_column(debug_backtrace(), 'function'));
+    $caller_file = debug_backtrace()[$key]['file'];
+
+    if ( $caller_file === $_SERVER['SCRIPT_FILENAME'] ) {
+        header("HTTP/1.1 401 Unauthorized");
+        echo 'Forbidden';
+        exit;
+    }
+}