Listado Completo de Extensiones Cargadas

Array
(
    [0] => Core
    [1] => date
    [2] => libxml
    [3] => openssl
    [4] => pcre
    [5] => zlib
    [6] => bz2
    [7] => calendar
    [8] => ctype
    [9] => hash
    [10] => filter
    [11] => ftp
    [12] => gettext
    [13] => gmp
    [14] => json
    [15] => iconv
    [16] => SPL
    [17] => random
    [18] => Reflection
    [19] => session
    [20] => standard
    [21] => mbstring
    [22] => SimpleXML
    [23] => sockets
    [24] => tokenizer
    [25] => xml
    [26] => cgi-fcgi
    [27] => mysqlnd
    [28] => bcmath
    [29] => curl
    [30] => dba
    [31] => dom
    [32] => enchant
    [33] => fileinfo
    [34] => gd
    [35] => imagick
    [36] => imap
    [37] => intl
    [38] => ldap
    [39] => exif
    [40] => mysqli
    [41] => odbc
    [42] => PDO
    [43] => pdo_mysql
    [44] => PDO_ODBC
    [45] => pdo_pgsql
    [46] => pdo_sqlite
    [47] => pgsql
    [48] => Phar
    [49] => posix
    [50] => pspell
    [51] => redis
    [52] => soap
    [53] => sodium
    [54] => sqlite3
    [55] => sysvmsg
    [56] => sysvsem
    [57] => sysvshm
    [58] => tidy
    [59] => xmlreader
    [60] => xmlwriter
    [61] => xsl
    [62] => zip
    [63] => Zend OPcache
)

Prueba libreria con validar DNI (correcto no devuelve nada)

12345678Z:

12365478J: El DNI no es válido.