redirect logger

redirect-log.php

<?php

add_filter(
	'wp_redirect',
	function( $location ) {
		$log_entry = sprintf(
			"[%s] - Redirect URI: %s\nStack Trace: %s\n\n",
			date( 'Y-m-d H:i:s' ),
			$location,
			wp_debug_backtrace_summary()
		);

		$upload_dir = wp_upload_dir();
		$log_path   = $upload_dir['basedir'] . '/redirect-log.txt';

		error_log( $log_entry, 3, $log_path );

		return $location;
	}
);