Checkboxes com palestras e origem selecionada automaticamente

page-palestras

<fieldset>
<legend>Todas as palestras</legend>


<?php // WP_Query arguments
$args = array (
	'post_type' => array( 'palestra' ),
);

// The Query
$palestras = new WP_Query( $args );


// The Loop
if ( $palestras->have_posts() ) {
	while ( $palestras->have_posts() ) {
		$palestras->the_post();

	    // Pega a url, extrai o array, extrai "id="" do array e retorna valor
	    $url = home_url( add_query_arg( NULL, NULL ) );
	    $tiraid = parse_url($url, PHP_URL_QUERY);
	    $resto = substr($tiraid, 3);

	    // Config Checked();
	    $checked = $resto;
	    $current = get_the_ID();
	    $echo = true;

		echo '<br /><label><input type="checkbox" name="';
		get_the_title();
		echo '" value="';
		get_the_ID();
		echo '" ';

		// Aqui a mágica acontece
		if ( $checked == $current ) echo 'checked="checked"';

		echo ' />';
		the_title();
		echo '</label><br />';
	}
} else {
	// no posts found
}

// Restore original Post Data
wp_reset_postdata();
?>

<input type="submit" value="Enviar" /></fieldset>