Only use the last part of the name of the GlyphIcon. The second parameter is the font-size used for sizing the GlyphIcon.
<?php
// only use the last part o f the name of the GlyphIcon. The second parameter is the font-size used for sizing the GlyphIcon.
$glyphicon = new Barebone\Bootstrap\GlyphIcon('barcode', 32);
$glyphicon1 = new Barebone\Bootstrap\GlyphIcon('align-left',28);
$glyphicon2 = new Barebone\Bootstrap\GlyphIcon('align-center', 28);
$glyphicon3 = new Barebone\Bootstrap\GlyphIcon('align-right', 16);
echo $glyphicon.$glyphicon1.$glyphicon2.$glyphicon3;
<span class="glyphicon glyphicon-barcode" style="font-size:32px"></span> <span class="glyphicon glyphicon-align-left" style="font-size:28px"></span> <span class="glyphicon glyphicon-align-center" style="font-size:28px"></span> <span class="glyphicon glyphicon-align-right" style="font-size:16px"></span>
You can access the glyphicons also as constant.
<?= Barebone\Bootstrap\GlyphIcon::ICON_ALIGN_LEFT;
glyphicon-align-left
<?php
//
// ICONS
// --------------------------------------------------
const ICON_ADJUST = 'glyphicon-adjust';
const ICON_ALIGN_CENTER = 'glyphicon-align-center';
const ICON_ALIGN_JUSTIFY = 'glyphicon-align-justify';
const ICON_ALIGN_LEFT = 'glyphicon-align-left';
const ICON_ALIGN_RIGHT = 'glyphicon-align-right';
const ICON_ARROW_DOWN = 'glyphicon-arrow-down';
const ICON_ARROW_LEFT = 'glyphicon-arrow-left';
const ICON_ARROW_RIGHT = 'glyphicon-arrow-right';
const ICON_ARROW_UP = 'glyphicon-arrow-up';
const ICON_ASTERISK = 'glyphicon-asterisk';
const ICON_BACKWARD = 'glyphicon-backward';
const ICON_BAN_CIRCLE = 'glyphicon-ban-circle';
const ICON_BARCODE = 'glyphicon-barcode';
const ICON_BELL = 'glyphicon-bell';
const ICON_BOLD = 'glyphicon-bold';
const ICON_BOOK = 'glyphicon-book';
const ICON_BOOKMARK = 'glyphicon-bookmark';
const ICON_BRIEFCASE = 'glyphicon-briefcase';
const ICON_BULLHORN = 'glyphicon-bullhorn';
const ICON_CALENDAR = 'glyphicon-calendar';
const ICON_CAMERA = 'glyphicon-camera';
const ICON_CERTIFICATE = 'glyphicon-certificate';
const ICON_CHECK = 'glyphicon-check';
const ICON_CHEVRON_DOWN = 'glyphicon-chevron-down';
const ICON_CHEVRON_LEFT = 'glyphicon-chevron-left';
const ICON_CHEVRON_RIGHT = 'glyphicon-chevron-right';
const ICON_CHEVRON_UP = 'glyphicon-chevron-up';
const ICON_CIRCLE_ARROW_DOWN = 'glyphicon-circle-arrow-down';
const ICON_CIRCLE_ARROW_LEFT = 'glyphicon-circle-arrow-left';
const ICON_CIRCLE_ARROW_RIGHT = 'glyphicon-circle-arrow-right';
const ICON_CIRCLE_ARROW_UP = 'glyphicon-circle-arrow-up';
const ICON_CLOUD = 'glyphicon-cloud';
const ICON_CLOUD_DOWNLOAD = 'glyphicon-cloud-download';
const ICON_CLOUD_UPLOAD = 'glyphicon-cloud-upload';
const ICON_COG = 'glyphicon-cog';
const ICON_COLLAPSE_DOWN = 'glyphicon-collapse-down';
const ICON_COLLAPSE_UP = 'glyphicon-collapse-up';
const ICON_COMMENT = 'glyphicon-comment';
const ICON_COMPRESSED = 'glyphicon-compressed';
const ICON_COPYRIGHT_MARK = 'glyphicon-copyright-mark';
const ICON_CREDIT_CARD = 'glyphicon-credit-card';
const ICON_CUTLERY = 'glyphicon-cutlery';
const ICON_DASHBOARD = 'glyphicon-dashboard';
const ICON_DOWNLOAD = 'glyphicon-download';
const ICON_DOWNLOAD_ALT = 'glyphicon-download-alt';
const ICON_EARPHONE = 'glyphicon-earphone';
const ICON_EDIT = 'glyphicon-edit';
const ICON_EJECT = 'glyphicon-eject';
const ICON_ENVELOPE = 'glyphicon-envelope';
const ICON_EURO = 'glyphicon-euro';
const ICON_EXCLAMATION_SIGN = 'glyphicon-exclamation-sign';
const ICON_EXPAND = 'glyphicon-expand';
const ICON_EXPORT = 'glyphicon-export';
const ICON_EYE_CLOSE = 'glyphicon-eye-close';
const ICON_EYE_OPEN = 'glyphicon-eye-open';
const ICON_FACETIME_VIDEO = 'glyphicon-facetime-video';
const ICON_FAST_BACKWARD = 'glyphicon-fast-backward';
const ICON_FAST_FORWARD = 'glyphicon-fast-forward';
const ICON_FILE = 'glyphicon-file';
const ICON_FILM = 'glyphicon-film';
const ICON_FILTER = 'glyphicon-filter';
const ICON_FIRE = 'glyphicon-fire';
const ICON_FLAG = 'glyphicon-flag';
const ICON_FLASH = 'glyphicon-flash';
const ICON_FLOPPY_DISK = 'glyphicon-floppy-disk';
const ICON_FLOPPY_OPEN = 'glyphicon-floppy-open';
const ICON_FLOPPY_REMOVE = 'glyphicon-floppy-remove';
const ICON_FLOPPY_SAVE = 'glyphicon-floppy-save';
const ICON_FLOPPY_SAVED = 'glyphicon-floppy-saved';
const ICON_FOLDER_CLOSE = 'glyphicon-folder-close';
const ICON_FOLDER_OPEN = 'glyphicon-folder-open';
const ICON_FONT = 'glyphicon-font';
const ICON_FORWARD = 'glyphicon-forward';
const ICON_FULLSCREEN = 'glyphicon-fullscreen';
const ICON_GBP = 'glyphicon-gbp';
const ICON_GIFT = 'glyphicon-gift';
const ICON_GLASS = 'glyphicon-glass';
const ICON_GLOBE = 'glyphicon-globe';
const ICON_HAND_DOWN = 'glyphicon-hand-down';
const ICON_HAND_LEFT = 'glyphicon-hand-left';
const ICON_HAND_RIGHT = 'glyphicon-hand-right';
const ICON_HAND_UP = 'glyphicon-hand-up';
const ICON_HD_VIDEO = 'glyphicon-hd-video';
const ICON_HDD = 'glyphicon-hdd';
const ICON_HEADER = 'glyphicon-header';
const ICON_HEADPHONES = 'glyphicon-headphones';
const ICON_HEART = 'glyphicon-heart';
const ICON_HEART_EMPTY = 'glyphicon-heart-empty';
const ICON_HOME = 'glyphicon-home';
const ICON_IMPORT = 'glyphicon-import';
const ICON_INBOX = 'glyphicon-inbox';
const ICON_INDENT_LEFT = 'glyphicon-indent-left';
const ICON_INDENT_RIGHT = 'glyphicon-indent-right';
const ICON_INFO_SIGN = 'glyphicon-info-sign';
const ICON_ITALIC = 'glyphicon-italic';
const ICON_LEAF = 'glyphicon-leaf';
const ICON_LINK = 'glyphicon-link';
const ICON_LIST = 'glyphicon-list';
const ICON_LIST_ALT = 'glyphicon-list-alt';
const ICON_LOCK = 'glyphicon-lock';
const ICON_LOG_IN = 'glyphicon-log-in';
const ICON_LOG_OUT = 'glyphicon-log-out';
const ICON_MAGNET = 'glyphicon-magnet';
const ICON_MAP_MARKER = 'glyphicon-map-marker';
const ICON_MINUS = 'glyphicon-minus';
const ICON_MINUS_SIGN = 'glyphicon-minus-sign';
const ICON_MOVE = 'glyphicon-move';
const ICON_MUSIC = 'glyphicon-music';
const ICON_NEW_WINDOW = 'glyphicon-new-window';
const ICON_OFF = 'glyphicon-off';
const ICON_OK = 'glyphicon-ok';
const ICON_OK_CIRCLE = 'glyphicon-ok-circle';
const ICON_OK_SIGN = 'glyphicon-ok-sign';
const ICON_OPEN = 'glyphicon-open';
const ICON_PAPERCLIP = 'glyphicon-paperclip';
const ICON_PAUSE = 'glyphicon-pause';
const ICON_PENCIL = 'glyphicon-pencil';
const ICON_PHONE = 'glyphicon-phone';
const ICON_PHONE_ALT = 'glyphicon-phone-alt';
const ICON_PICTURE = 'glyphicon-picture';
const ICON_PLANE = 'glyphicon-plane';
const ICON_PLAY = 'glyphicon-play';
const ICON_PLAY_CIRCLE = 'glyphicon-play-circle';
const ICON_PLUS = 'glyphicon-plus';
const ICON_PLUS_SIGN = 'glyphicon-plus-sign';
const ICON_PRINT = 'glyphicon-print';
const ICON_PUSHPIN = 'glyphicon-pushpin';
const ICON_QRCODE = 'glyphicon-qrcode';
const ICON_QUESTION_SIGN = 'glyphicon-question-sign';
const ICON_RANDOM = 'glyphicon-random';
const ICON_RECORD = 'glyphicon-record';
const ICON_REFRESH = 'glyphicon-refresh';
const ICON_REGISTRATION_MARK = 'glyphicon-registration-mark';
const ICON_REMOVE = 'glyphicon-remove';
const ICON_REMOVE_CIRCLE = 'glyphicon-remove-circle';
const ICON_REMOVE_SIGN = 'glyphicon-remove-sign';
const ICON_REPEAT = 'glyphicon-repeat';
const ICON_RESIZE_FULL = 'glyphicon-resize-full';
const ICON_RESIZE_HORIZONTAL = 'glyphicon-resize-horizontal';
const ICON_RESIZE_SMALL = 'glyphicon-resize-small';
const ICON_RESIZE_VERTICAL = 'glyphicon-resize-vertical';
const ICON_RETWEET = 'glyphicon-retweet';
const ICON_ROAD = 'glyphicon-road';
const ICON_SAVE = 'glyphicon-save';
const ICON_SAVED = 'glyphicon-saved';
const ICON_SCREENSHOT = 'glyphicon-screenshot';
const ICON_SD_VIDEO = 'glyphicon-sd-video';
const ICON_SEARCH = 'glyphicon-search';
const ICON_SEND = 'glyphicon-send';
const ICON_SHARE = 'glyphicon-share';
const ICON_SHARE_ALT = 'glyphicon-share-alt';
const ICON_SHOPPING_CART = 'glyphicon-shopping-cart';
const ICON_SIGNAL = 'glyphicon-signal';
const ICON_SORT = 'glyphicon-sort';
const ICON_SORT_BY_ALPHABET = 'glyphicon-sort-by-alphabet';
const ICON_SORT_BY_ALPHABET_ALT = 'glyphicon-sort-by-alphabet-alt';
const ICON_SORT_BY_ATTRIBUTES = 'glyphicon-sort-by-attributes';
const ICON_SORT_BY_ATTRIBUTES_ALT = 'glyphicon-sort-by-attributes-alt';
const ICON_SORT_BY_ORDER = 'glyphicon-sort-by-order';
const ICON_SORT_BY_ORDER_ALT = 'glyphicon-sort-by-order-alt';
const ICON_SOUND_5_1 = 'glyphicon-sound-5-1';
const ICON_SOUND_6_1 = 'glyphicon-sound-6-1';
const ICON_SOUND_7_1 = 'glyphicon-sound-7-1';
const ICON_SOUND_DOLBY = 'glyphicon-sound-dolby';
const ICON_SOUND_STEREO = 'glyphicon-sound-stereo';
const ICON_STAR = 'glyphicon-star';
const ICON_STAR_EMPTY = 'glyphicon-star-empty';
const ICON_STATS = 'glyphicon-stats';
const ICON_STEP_BACKWARD = 'glyphicon-step-backward';
const ICON_STEP_FORWARD = 'glyphicon-step-forward';
const ICON_STOP = 'glyphicon-stop';
const ICON_SUBTITLES = 'glyphicon-subtitles';
const ICON_TAG = 'glyphicon-tag';
const ICON_TAGS = 'glyphicon-tags';
const ICON_TASKS = 'glyphicon-tasks';
const ICON_TEXT_HEIGHT = 'glyphicon-text-height';
const ICON_TEXT_WIDTH = 'glyphicon-text-width';
const ICON_TH = 'glyphicon-th';
const ICON_TH_LARGE = 'glyphicon-th-large';
const ICON_TH_LIST = 'glyphicon-th-list';
const ICON_THUMBS_DOWN = 'glyphicon-thumbs-down';
const ICON_THUMBS_UP = 'glyphicon-thumbs-up';
const ICON_TIME = 'glyphicon-time';
const ICON_TINT = 'glyphicon-tint';
const ICON_TOWER = 'glyphicon-tower';
const ICON_TRANSFER = 'glyphicon-transfer';
const ICON_TRASH = 'glyphicon-trash';
const ICON_TREE_CONIFER = 'glyphicon-tree-conifer';
const ICON_TREE_DECIDUOUS = 'glyphicon-tree-deciduous';
const ICON_UNCHECKED = 'glyphicon-unchecked';
const ICON_UPLOAD = 'glyphicon-upload';
const ICON_USD = 'glyphicon-usd';
const ICON_USER = 'glyphicon-user';
const ICON_VOLUME_DOWN = 'glyphicon-volume-down';
const ICON_VOLUME_OFF = 'glyphicon-volume-off';
const ICON_VOLUME_UP = 'glyphicon-volume-up';
const ICON_WARNING_SIGN = 'glyphicon-warning-sign';
const ICON_WRENCH = 'glyphicon-wrench';
const ICON_ZOOM_IN = 'glyphicon-zoom-in';
const ICON_ZOOM_OUT = 'glyphicon-zoom-out';