var_dump as dashboard notice.

dev.php

<?php

/**
 * Function to var_dump contents as WordPress Dashboard notification.
 *
 * Instructions:
 * Optional argument $file can be supplied as __FILE__ $line supplied as __LINE__ if you also want to
 * print out the file and line number (for whatever reason) where this function is called.
 *
 * @param variable $dump_this Will dump the variable as an admin notice.
 * @param string   $file Original file link.
 * @param string   $line number where the functino is executed.
 */
function dd( $dump_this, $file = 'NA', $line = 'NA' ) {
	add_action(
		'admin_notices',
		function () use ( $dump_this, $file, $line ) {
			echo '<div class="notice  is-dismissible">';
			if ( 'NA' !== $file ) {
				echo '<span style="color:#be5046;font-weight:600">' . esc_html( $file ) . '</span>';
			}
			if ( 'NA' !== $line ) {
				echo '<span style="color:#98c379;font-weight:600"> : ' . esc_html( $line ) . '</span>';
			}
			var_dump( $dump_this ); // phpcs:ignore
			echo '</div>';
			return;
		}
	);
}