Get SVG File in php

svg_allowed_html

function get_svg_allowed_html() {
	$allowed_html = [
		'svg'            => [
			'fill'      => true,
			'height'    => true,
			'width'     => true,
			'xmlns'     => true,
			'viewbox'   => true,
			'class'     => true,
			'transform' => true,
      'id'        => true
		],
		'path'           => [
			'class'        => true,
			'd'            => true,
      'id'            => true,
			'fill'         => true,
			'opacity'      => true,
			'fill-opacity' => true,
			'style'        => true,
			'stroke'       => true,
			'stroke-width' => true,
			'transform'    => true,
		],
		'circle'         => [
			'class' => true,
			'cx'    => true,
			'cy'    => true,
			'fill'  => true,
			'r'     => true,
		],
		'defs'           => true,
		'lineargradient' => [
			'class'         => true,
			'gradientunits' => true,
			'id'            => true,
			'x1'            => true,
			'x2'            => true,
			'xlink:href'    => true,
			'y1'            => true,
			'y2'            => true,
		],
		'stop'           => [
			'class'        => true,
			'offset'       => true,
			'style'        => true,
			'stop-color'   => true,
			'stop-opacity' => true,
		],
		'rect'           => [
			'class'        => true,
			'fill-opacity' => true,
			'fill'         => true,
			'height'       => true,
			'rx'           => true,
			'stroke-width' => true,
			'stroke'       => true,
			'transform'    => true,
			'width'        => true,
			'y'            => true,
		],
		'g'              => [
			'class'     => true,
			'clip-path' => true,
			'fill'      => true,
			'opacity'   => true,
		],
		'clippath'       => [
			'class' => true,
			'id'    => true,
		],
	];

	return $allowed_html;
}

use_svg.php

<?php
/**
 * Custom template tags for this theme.
 *
 * This file is for custom template tags only and it should not contain
 * functions that will be used for filtering or adding an action.
 *
 * All functions should be prefixed with UstTheme in order to prevent
 * pollution of the global namespace and potential conflicts with functions
 * from plugins.
 * Example: `ust_scaffold_function()`
 *
 * @package UstTheme\Template_Tags
 *
 */

// phpcs:ignoreFile

if ( ! function_exists( 'ust_get_svg' ) ) :
	/**
	 * Outputs an SVG file from the theme
	 *
	 * @param string  $filename Filename of the SVG to get.
	 * @param boolean $echo Echo or return. Default false.
	 * @param array   $attr Array of optional attributes.
	 * @return string HTML for the SVG.
	 */
	function ust_get_svg( $filename = '', $echo = false, $attr = array() ) {
		$default_attr = array(
			'class'       => 'svg',
			'aria-hidden' => 'true',
		);

		$attrs = '';

		$attr = wp_parse_args( $attr, $default_attr );
		$attr = array_map( 'esc_attr', $attr );

		// Bail early if no filename is passed
		if ( empty( $filename ) ) {
			return;
		}

		if ( ! file_exists( UST_THEME_PATH . "dist/svg/{$filename}.svg" ) ) {
			return;
		}

		// Get the SVG
		$svg = file_get_contents( UST_THEME_PATH . "dist/svg/{$filename}.svg" ); // phpcs:ignore

		foreach ( $attr as $name => $value ) {
			$attrs .= " $name=" . '"' . $value . '"';
		}

		ob_start();
		?>
		<span <?php echo $attrs; // phpcs:ignore ?>>
			<?php echo wp_kses( $svg, get_svg_allowed_html() ); ?>
		</span>
		<?php
		$svg = \ob_get_clean();

		// Output the SVG
		if ( $echo ) {
			echo $svg; // phpcs:ignore
		}

		return $svg;
	}
endif;

if ( ! function_exists( 'ust_the_svg' ) ) {
	function ust_the_svg( $filename = '', $attr = array() ) {
		ust_get_svg( $filename, true, $attr );
	}
}