Uniform Resource Identifier (URI) Schemes.

uri-schemes.php

<?php
// All schemes from IANA
// https://www.iana.org/assignments/uri-schemes/uri-schemes.txt
return [
    'aaa',
    'aaas',
    'about',
    'acap',
    'acct',
    'acd',
    'acr',
    'adiumxtra',
    'adt',
    'afp',
    'afs',
    'aim',
    'amss',
    'android',
    'appdata',
    'apt',
    'ar',
    'ark',
    'at',
    'attachment',
    'aw',
    'barion',
    'bb',
    'beshare',
    'bitcoin',
    'bitcoincash',
    'blob',
    'bolo',
    'brid',
    'browserext',
    'cabal',
    'calculator',
    'callto',
    'cap',
    'cast',
    'casts',
    'chrome',
    'chrome-extension',
    'cid',
    'coap',
    'coap+tcp',
    'coap+ws',
    'coaps',
    'coaps+tcp',
    'coaps+ws',
    'com-eventbrite-attendee',
    'content',
    'content-type',
    'crid',
    'cstr',
    'cvs',
    'dab',
    'dat',
    'data',
    'dav',
    'dhttp',
    'diaspora',
    'dict',
    'did',
    'dis',
    'dlna-playcontainer',
    'dlna-playsingle',
    'dns',
    'dntp',
    'doi',
    'dpp',
    'drm',
    'drop',
    'dtmi',
    'dtn',
    'dvb',
    'dvx',
    'dweb',
    'ed2k',
    'eid',
    'elsi',
    'embedded',
    'ens',
    'ethereum',
    'example',
    'facetime',
    'fax',
    'feed',
    'feedready',
    'fido',
    'file',
    'filesystem',
    'finger',
    'first-run-pen-experience',
    'fish',
    'fm',
    'ftp',
    'fuchsia-pkg',
    'geo',
    'gg',
    'git',
    'gitoid',
    'gizmoproject',
    'go',
    'gopher',
    'graph',
    'grd',
    'gtalk',
    'h323',
    'ham',
    'hcap',
    'hcp',
    'hs20',
    'http',
    'https',
    'hxxp',
    'hxxps',
    'hydrazone',
    'hyper',
    'iax',
    'icap',
    'icon',
    'im',
    'imap',
    'info',
    'iotdisco',
    'ipfs',
    'ipn',
    'ipns',
    'ipp',
    'ipps',
    'irc',
    'irc6',
    'ircs',
    'iris',
    'iris.beep',
    'iris.lwz',
    'iris.xpc',
    'iris.xpcs',
    'isostore',
    'itms',
    'jabber',
    'jar',
    'jms',
    'keyparc',
    'lastfm',
    'lbry',
    'ldap',
    'ldaps',
    'leaptofrogans',
    'lid',
    'lorawan',
    'lpa',
    'lvlt',
    'machineProvisioningProgressReporter',
    'magnet',
    'mailserver',
    'mailto',
    'maps',
    'market',
    'matrix',
    'message',
    'microsoft.windows.camera',
    'microsoft.windows.camera.multipicker',
    'microsoft.windows.camera.picker',
    'mid',
    'mms',
    'modem',
    'mongodb',
    'moz',
    'ms-access',
    'ms-appinstaller',
    'ms-browser-extension',
    'ms-calculator',
    'ms-drive-to',
    'ms-enrollment',
    'ms-excel',
    'ms-eyecontrolspeech',
    'ms-gamebarservices',
    'ms-gamingoverlay',
    'ms-getoffice',
    'ms-help',
    'ms-infopath',
    'ms-inputapp',
    'ms-launchremotedesktop',
    'ms-lockscreencomponent-config',
    'ms-media-stream-id',
    'ms-meetnow',
    'ms-mixedrealitycapture',
    'ms-mobileplans',
    'ms-newsandinterests',
    'ms-officeapp',
    'ms-people',
    'ms-project',
    'ms-powerpoint',
    'ms-publisher',
    'ms-recall',
    'ms-remotedesktop',
    'ms-remotedesktop-launch',
    'ms-restoretabcompanion',
    'ms-screenclip',
    'ms-screensketch',
    'ms-search',
    'ms-search-repair',
    'ms-secondary-screen-controller',
    'ms-secondary-screen-setup',
    'ms-settings',
    'ms-settings-airplanemode',
    'ms-settings-bluetooth',
    'ms-settings-camera',
    'ms-settings-cellular',
    'ms-settings-cloudstorage',
    'ms-settings-connectabledevices',
    'ms-settings-displays-topology',
    'ms-settings-emailandaccounts',
    'ms-settings-language',
    'ms-settings-location',
    'ms-settings-lock',
    'ms-settings-nfctransactions',
    'ms-settings-notifications',
    'ms-settings-power',
    'ms-settings-privacy',
    'ms-settings-proximity',
    'ms-settings-screenrotation',
    'ms-settings-wifi',
    'ms-settings-workplace',
    'ms-spd',
    'ms-stickers',
    'ms-sttoverlay',
    'ms-transit-to',
    'ms-useractivityset',
    'ms-virtualtouchpad',
    'ms-visio',
    'ms-walk-to',
    'ms-whiteboard',
    'ms-whiteboard-cmd',
    'ms-word',
    'msnim',
    'msrp',
    'msrps',
    'mss',
    'mt',
    'mtqp',
    'mumble',
    'mupdate',
    'mvn',
    'mvrp',
    'mvrps',
    'news',
    'nfs',
    'ni',
    'nih',
    'nntp',
    'notes',
    'num',
    'ocf',
    'oid',
    'onenote',
    'onenote-cmd',
    'opaquelocktoken',
    'openid',
    'openpgp4fpr',
    'otpauth',
    'p1',
    'pack',
    'palm',
    'paparazzi',
    'payment',
    'payto',
    'pkcs11',
    'platform',
    'pop',
    'pres',
    'prospero',
    'proxy',
    'pwid',
    'psyc',
    'pttp',
    'qb',
    'query',
    'quic-transport',
    'redis',
    'rediss',
    'reload',
    'res',
    'resource',
    'rmi',
    'rsync',
    'rtmfp',
    'rtmp',
    'rtsp',
    'rtsps',
    'rtspu',
    'sarif',
    'secondlife',
    'secret-token',
    'service',
    'session',
    'sftp',
    'sgn',
    'shc',
    'shttp (OBSOLETE)',
    'sieve',
    'simpleledger',
    'simplex',
    'sip',
    'sips',
    'skype',
    'smb',
    'smp',
    'sms',
    'smtp',
    'snews',
    'snmp',
    'soap.beep',
    'soap.beeps',
    'soldat',
    'spiffe',
    'spotify',
    'ssb',
    'ssh',
    'starknet',
    'steam',
    'stun',
    'stuns',
    'submit',
    'svn',
    'swh',
    'swid',
    'swidpath',
    'tag',
    'taler',
    'teamspeak',
    'tel',
    'teliaeid',
    'telnet',
    'tftp',
    'things',
    'thismessage',
    'tip',
    'tn3270',
    'tool',
    'turn',
    'turns',
    'tv',
    'udp',
    'unreal',
    'upt',
    'urn',
    'ut2004',
    'uuid-in-package',
    'v-event',
    'vemmi',
    'ventrilo',
    'ves',
    'videotex',
    'vnc',
    'view-source',
    'vscode',
    'vscode-insiders',
    'vsls',
    'w3',
    'wais',
    'web3',
    'wcr',
    'webcal',
    'web+ap',
    'wifi',
    'wpid',
    'ws',
    'wss',
    'wtai',
    'wyciwyg',
    'xcon',
    'xcon-userid',
    'xfire',
    'xmlrpc.beep',
    'xmlrpc.beeps',
    'xmpp',
    'xftp',
    'xrcp',
    'xri',
    'ymsgr',
    'z39.50',
    'z39.50r',
    'z39.50s',
];