Initial commit.

config.lib.php

@@ -0,0 +1,42 @@
+<?php
+/*
+ * Return a configuration value or secret.
+ *
+ * Values come from the environment first (for example Apache SetEnv),
+ * then from the .env file, then from $default. The .env file is the one
+ * named by the XXX_ENV_FILE environment variable, or else the .env file
+ * next to this one. Git does not track .env; see .env.example.
+ *
+ * Each line of .env is NAME=value. Blank lines and lines that start
+ * with # are skipped, and quotes around a value are removed.
+ */
+function config($key, $default = NULL) {
+  static $values = NULL;
+
+  $env = getenv($key);
+  if ($env !== FALSE)
+    return $env;
+
+  if ($values === NULL) {
+    $values = array();
+    $file = getenv('XXX_ENV_FILE') ?: __DIR__ . '/.env';
+    if (is_readable($file)) {
+      foreach (file($file, FILE_IGNORE_NEW_LINES) as $line) {
+        $line = trim($line);
+        if ($line === '' || $line[0] === '#' || strpos($line, '=') === FALSE)
+          continue;
+        list($name, $value) = explode('=', $line, 2);
+        $name  = trim(preg_replace('/^export\s+/', '', $name));
+        $value = trim($value);
+        if (strlen($value) >= 2 &&
+            ($value[0] === '"' || $value[0] === "'") &&
+            substr($value, -1) === $value[0])
+          $value = substr($value, 1, -1);
+        $values[$name] = $value;
+      }
+    }
+  }
+
+  return array_key_exists($key, $values) ? $values[$key] : $default;
+}
+?>