cURL – 127 uses (requires libcurl)
- HTTP API (class
WP_Http_curl
) url_is_accessable_via_ssl()
- SimplePie (overridden with class
WP_SimplePie_File
) - GoogleSpell (from TinyMCE package, is not used?)
Date/Time – 367 uses
DOM – 6 uses (requires libxml)
iis7_rewrite_rule_exists()
iis7_delete_rewrite_rule()
iis7_add_rewrite_rule()
saveDomDocument()
POSIX Regex – 23 uses
Filter – 2 uses
- class
PHPMailer->ValidateAddress()
(optional)
FTP – 72 uses
- class
ftp_base
- class
ftp
(pure and sockets versions) - class
WP_Filesystem_FTPext
- class
WP_Filesystem_ftpsockets
GD – 56 uses
wp-admin\includes\image-edit.php
wp-admin\includes\image.php
wp-includes\media.php
Hash – 6 uses
wp-includes\pluggable.php
multiple uses (optional – fallback inwp-includes\compat.php
)
iconv – 5 uses
- class
SimplePie
(optional) wp_check_invalid_utf8()
(optional)wp-mail.php
(optional)
JSON – 20 uses
- optional, fallbacks in
wp-includes/compat.php
libxml – 4 uses
- class
WP_oEmbed->_parse_xml()
(optional) - SimplePie
Multibyte String – 29 uses
- some fallback in
wp-includes/compat.php
MySQL – 60 uses
- class
wpdb
- class
SimplePie_Cache
(overridden with classWP_Feed_Cache
)
OpenSSL – 4 uses
- class
PHPMailer
PCRE – 743 uses
SimpleXML – 1 uses
- class
WP_oEmbed
(seems optional)
Sockets – 64 uses
- class
ftp
(sockets
implementation)
SPL – 3 uses
-
Tokenizer – 3 uses
wp_doc_link_parse()
(optional)
XML Parser – 89 uses
XMLReader – 1 uses
- SimplePie (seems optional)