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Filename : Headers.php

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<?php declare(strict_types = 1);
/**
 * Abstract output class for HTTP headers.
 *
 * @package query-monitor
 */

abstract class QM_Output_Headers extends QM_Output {

	/**
	 * @return void
	 */
	public function output() {

		$id = $this->collector->id;

		foreach ( $this->get_output() as $key => $value ) {
			if ( ! is_scalar( $value ) ) {
				$value = wp_json_encode( $value );
			}

			# Remove illegal characters (Header value may not contain NUL bytes)
			if ( is_string( $value ) ) {
				$value = str_replace( chr( 0 ), '', $value );
			}

			# Remove illegal characters (Header name may not contain underscores)
			$key = str_replace( '_', '-', $key );

			header( sprintf( 'X-QM-%s-%s: %s', $id, $key, $value ) );
		}

	}

}