PhpStorm IDE Plugin:
PHP Advanced AutoComplete

Plugin URL: https://plugins.jetbrains.com/plugin/7276

Adds auto-completion support for various built-in PHP functions and methods, where parameter is a string literal.

The following functions are currently supported:

• header / header_remove
  HTTP response headers, status codes, charsets, mime-types, locations, and much more

• File and folder related functions and methods (fopen, file_get_contents, dir...)
  Files and/or folders paths relative to the current file (completion and reference)

• date / strftime / DateTime::format etc
  Format characters and common format strings

• strtotime / DateTime constructor / DateTime::modify
  DateTime notations

• htmlentities / htmlspecialchars
  Supported charsets

• mb_string functions
  Charset, where required; types for mb_get_info and supported languages for mb_language

• extension_loaded
  Known PHP extensions

• fopen / popen / SplFileInfo::openFile
  File modes

• fsockopen / stream_socket_client
  Socket transports (tcp://, udp://, etc)

• mysql_connect/mysqli_connect/mysqli/PDO
  Hostnames, database names and usernames from data sources defined in project

• mysql_select_db/mysqli_select_db/mysqli::select_db
  Database names from data sources defined in project

• mysqli_change_user/mysqli::change_user
  Usernames and database names from data sources defined in project

• mysql_set_charset/mysqli_set_charset/mysqli::set_charset
  Supported charsets for MySQL

• getenv
  Common environment variables (like in $_SERVER array keys)

If you have further suggestions/ideas, just send me an e-mail to phpstorm at king2500.net.