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<?php
/**
 * Icons API: Icon registration and rendering helper functions.
 *
 * @package WordPress
 * @subpackage Icons
 * @since 7.1.0
 */

/**
 * Registers a new icon collection.
 *
 * @since 7.1.0
 *
 * @param string $slug Icon collection slug.
 * @param array  $args {
 *     Arguments for registering an icon collection.
 *
 *     @type string $label       Required. A human-readable label for the icon collection.
 *     @type string $description Optional. A human-readable description for the icon collection.
 * }
 * @return bool True if the icon collection was registered successfully, else false.
 */
function wp_register_icon_collection( $slug, $args ) {
	return WP_Icon_Collections_Registry::get_instance()->register( $slug, $args );
}

/**
 * Unregisters an icon collection.
 *
 * @since 7.1.0
 *
 * @param string $slug Icon collection slug.
 * @return bool True if the icon collection was unregistered successfully, else false.
 */
function wp_unregister_icon_collection( $slug ) {
	return WP_Icon_Collections_Registry::get_instance()->unregister( $slug );
}

/**
 * Registers a new icon.
 *
 * @since 7.1.0
 *
 * @param string $icon_name Namespaced icon name in the form "collection/icon-name"
 *                          (e.g. "my-plugin/arrow-left"). The "core" collection is
 *                          reserved for WordPress core icons; third-party code should
 *                          register icons under its own collection rather than the
 *                          "core" collection.
 * @param array  $args {
 *     List of properties for the icon.
 *
 *     @type string $label     Required. A human-readable label for the icon.
 *     @type string $content   Optional. SVG markup for the icon.
 *                             If not provided, the content will be retrieved from the `file_path` if set.
 *                             If both `content` and `file_path` are not set, the icon will not be registered.
 *     @type string $file_path Optional. The full path to the file containing the icon content.
 * }
 * @return bool True if the icon was registered successfully, else false.
 */
function wp_register_icon( $icon_name, $args ) {
	return WP_Icons_Registry::get_instance()->register( $icon_name, $args );
}

/**
 * Unregisters an icon.
 *
 * @since 7.1.0
 *
 * @param string $icon_name Namespaced icon name in the form "collection/icon-name"
 *                          (e.g. "core/arrow-left").
 * @return bool True if the icon was unregistered successfully, else false.
 */
function wp_unregister_icon( $icon_name ) {
	return WP_Icons_Registry::get_instance()->unregister( $icon_name );
}

/**
 * Registers the default icon collections.
 *
 * @since 7.1.0
 * @access private
 */
function _wp_register_default_icon_collections() {
	wp_register_icon_collection(
		'core',
		array(
			'label'       => __( 'WordPress' ),
			'description' => __( 'Default icon collection.' ),
		)
	);
}

/**
 * Registers the default core icons from the manifest.
 *
 * @since 7.1.0
 * @access private
 */
function _wp_register_default_icons() {
	$icons_directory = ABSPATH . WPINC . '/images/icon-library/';
	$manifest_path   = ABSPATH . WPINC . '/assets/icon-library-manifest.php';

if ( ! is_readable( $manifest_path ) ) {
		wp_trigger_error(
			__FUNCTION__,
			__( 'Core icon collection manifest is missing or unreadable.' )
		);
		return;
	}

$collection = include $manifest_path;

if ( empty( $collection ) ) {
		wp_trigger_error(
			__FUNCTION__,
			__( 'Core icon collection manifest is empty or invalid.' )
		);
		return;
	}

foreach ( $collection as $icon_name => $icon_data ) {
		if (
			empty( $icon_data['filePath'] )
			|| ! is_string( $icon_data['filePath'] )
		) {
			_doing_it_wrong(
				__FUNCTION__,
				__( 'Core icon collection manifest must provide a valid "filePath" for each icon.' ),
				'7.0.0'
			);
			return;
		}

wp_register_icon(
			'core/' . $icon_name,
			array(
				'label'     => $icon_data['label'],
				'file_path' => $icons_directory . $icon_data['filePath'],
			)
		);
	}
}

/**
 * Returns the SVG markup for a registered icon.
 *
 * @since 7.1.0
 *
 * @param string $name The namespaced icon name (e.g. 'core/plus',
 *                     'core/arrow-down', 'my-plugin/custom-icon').
 * @param array  $args {
 *     Optional. Arguments for the icon. Default empty array.
 *
 *     @type int|null $size  Width and height in pixels. Pass null to leave the
 *                           SVG's intrinsic dimensions untouched. Default 24.
 *     @type string   $class Additional CSS class names. Multiple classes may be
 *                           provided as a space-separated string. Default empty string.
 *     @type string   $label Accessible label. If provided, the SVG gets
 *                           role="img" and aria-label. If omitted, the SVG
 *                           gets aria-hidden="true" and focusable="false".
 *                           Default empty string.
 * }
 * @return string SVG markup for the icon, or empty string if not found.
 */
function wp_get_icon( $name, $args = array() ) {
	$icon = WP_Icons_Registry::get_instance()->get_registered_icon( $name );
	if ( is_null( $icon ) ) {
		return '';
	}

$svg = $icon['content'];
	if ( empty( $svg ) ) {
		return '';
	}

$args = wp_parse_args(
		$args,
		array(
			'size'  => 24,
			'class' => '',
			'label' => '',
		)
	);

$processor = new WP_HTML_Tag_Processor( $svg );
	if ( ! $processor->next_tag( 'svg' ) ) {
		return '';
	}

if ( is_numeric( $args['size'] ) ) {
		$size = absint( $args['size'] );
		$processor->set_attribute( 'width', (string) $size );
		$processor->set_attribute( 'height', (string) $size );
	}

if ( ! empty( $args['class'] ) ) {
		foreach ( preg_split( '/\s+/', $args['class'], -1, PREG_SPLIT_NO_EMPTY ) as $class_name ) {
			$processor->add_class( $class_name );
		}
	}

if ( ! empty( $args['label'] ) ) {
		$processor->set_attribute( 'role', 'img' );
		$processor->set_attribute( 'aria-label', $args['label'] );
		$processor->remove_attribute( 'aria-hidden' );
		$processor->remove_attribute( 'focusable' );
	} else {
		$processor->set_attribute( 'aria-hidden', 'true' );
		$processor->set_attribute( 'focusable', 'false' );
		$processor->remove_attribute( 'role' );
		$processor->remove_attribute( 'aria-label' );
	}

return $processor->get_updated_html();
}

Editing: icons.php

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