1 files changed, 41 insertions, 0 deletions
diff --git a/installer/installer.php b/installer/installer.php
index 7a417634..70afc440 100644
--- a/installer/installer.php
+++ b/installer/installer.php
@@ -178,4 +178,45 @@ class installer {
   static function prepend_prefix($prefix, $sql) {
     return  preg_replace("#{([a-zA-Z0-9_]+)}#", "{$prefix}$1", $sql);
   }
+
+  static function check_environment() {
+  if (!function_exists("mysql_query") && !function_exists("mysqli_set_charset")) {
+    $errors[] = "Gallery 3 requires a MySQL database, but PHP doesn't have either the <a href=\"http://php.net/mysql\">MySQL</a> or the  <a href=\"http://php.net/mysqli\">MySQLi</a> extension.";
+  }
+
+  if (!@preg_match("/^.$/u", utf8_encode("\xF1"))) {
+    $errors[] = "PHP is missing <a href=\"http://php.net/pcre\">Perl-Compatible Regular Expression</a> support.";
+  }
+
+  if (!(function_exists("spl_autoload_register"))) {
+    $errors[] = "PHP is missing <a href=\"http://php.net/spl\">Standard PHP Library (SPL)</a> support";
+  }
+
+  if (!(class_exists("ReflectionClass"))) {
+    $errors[] = "PHP is missing <a href=\"http://php.net/reflection\">reflection</a> support";
+  }
+
+  if (!(function_exists("filter_list"))) {
+    $errors[] = "PHP is missing the <a href=\"http://php.net/filter\">filter extension</a>";
+  }
+
+  if (!(extension_loaded("iconv"))) {
+    $errors[] = "PHP is missing the <a href=\"http://php.net/iconv\">iconv extension</a>";
+  }
+
+  if (!(extension_loaded("simplexml"))) {
+    $errors[] = "PHP is missing the <a href=\"http://php.net/simplexml\">SimpleXML extension</a>";
+  }
+
+  if (extension_loaded("mbstring") && (ini_get("mbstring.func_overload") & MB_OVERLOAD_STRING)) {
+    $errors[] = "The <a href=\"http://php.net/mbstring\">mbstring extension</a> is overloading PHP's native string functions.  Please disable it.";
+  }
+
+  if (!function_exists("json_encode")) {
+    $errors[] = "PHP is missing the <a href=\"http://php.net/manual/en/book.json.php\">JavaScript Object Notation (JSON) extension</a>.  Please install it.";
+  }
+
+  return @$errors;
+}
+
 }