Ändern Sie Ihren Beitrag mit einer schönen Petition

// e-mail address validating function
function validate_email( $email ) {
	if ( $email == '' ) {
		return false;
	} else {
		return filter_var( $email, FILTER_VALIDATE_EMAIL );
	}
}

// e-mail address validating function
function validate_email( $email ) {
	if ( $email == '' ) {
		return false;
	} else {
		$eregi = preg_replace( '/([a-z0-9_.-]+)' . '@' . '([a-z0-9.-]+){2,255}' . '.' . '([a-z]+){2,10}/i', '', $email );
	}
	return empty( $eregi ) ? true : false;
}

// submit the signer with a 'petition_submission' meta key to the post
function submission( $name, $email, $date ) {
	global $post;
	$array = array( 'name' => $name, 'email' => $email, 'date' => $date );
	$petition_meta = serialize( $array );
	add_post_meta( $post->ID, 'petition_submission', $petition_meta );
	return true;
}

// fetch the submissions from the post
function get_the_submissions( $number = 5 ) {
	$petition_meta = get_post_custom_values( 'petition_submission' );
	if ( $petition_meta ) {
		$output = array_slice( $petition_meta, $number * -1 );
		return array_reverse( $output );
	}
}

#petition_form {}
#petition_form label {
	font-weight: bold;
	font-size: larger;
	line-height: 150%;
}
#petition_form input {
	display: block;
	margin: 5px 0;
	padding: 3px;
}
#petition_name {
	width: 200px;
}
#petition_email {
	width: 200px;
}
#petition_submit {
	padding: 5px;
}
.petition_success {
	color: #693;
}
.petition_error {
	color: #A00;
}
.petition_list {
	list-style: none;
	margin: 0;
	padding: 0;
}
.petition_list li {
	background-image: none !important;
}
.petition_list span {
	display: inline-block;
	width: 45%;
	padding: 1%;
	margin: 1%;
	background-color: #FAFAFA;
}
.submission_name {}
.submission_date {
	font-style: italic;
	color: #888;
}

function petition_form_sc( $atts ) {
	// extract the shortcode parameters
	extract( shortcode_atts( array(
		// the text value of the submit button
		'submit' => 'Submit',
		// the text for the error message
		'error' => 'Your e-mail address is not valid. Please re-enter the form with a valid name and e-mail address.',
		// the text when the submission is successful
		'success' => 'Your submission has been saved. Thank you!'
	), $atts ) );

	// the HTML elements of our petition form
	$form = '<form action="'.get_permalink().'" method="post" id="petition_form">
		<label for="petition_name">Name:</label>
		<input type="text" name="petition_name" id="petition_name" />
		<label for="petition_email">E-mail address:</label>
		<input type="text" name="petition_email" id="petition_email" />
		<input type="submit" name="petition_submit" id="petition_submit" class="submit" value="'.$submit.'" />
	</form>';

	// if the form is "POST"ed...
	if ( $_SERVER['REQUEST_METHOD'] == 'POST' ) {
		// ...get the name...
		$name = $_POST['petition_name'];
		// ...and the e-mail address...
		$email = $_POST['petition_email'];
		// ...and the date of "just now", with the date format of your WP options.
		$date = date( get_option( 'date_format' ) );
		// validate the e-mail address first!
		if ( validate_email( $email ) == true ) {
			// the e-mail address is valid! remember the function below?
			submission( $name, $email, $date );
			// we sent the variables with the submission() function, now we print the success message WITHOUT THE FORM:
			return '<div class="petition_success">' . $success . '</div>';
			// (if you want the form to be printed again after the submission, just add .$form before the semicolon.)
		} else {
			// the e-mail address is NOT valid! we should print the error message WITH THE FORM:
			return '<div class="petition_error">' . $error . '</div>' . $form;
		}
	}
	// and if the form isn't "POST"ed (meaning the visitor just visited the page), just show the form!
	else {
		return $form;
	}
}
add_shortcode( 'petition_form', 'petition_form_sc' );

function petition_list_sc( $atts ) {
	// extract the shortcode parameters
	extract( shortcode_atts( array(
		// we could set a default number but remember, we already did that in the get_the_submissions() function :)
		'number' => ''
	), $atts ) );

	// get the $number latest submissions...
	$submissions = get_the_submissions( $number );

	// ...and list 'em!
	$output = '<ul class="petition_list">';
	if ( $submissions ) {
		foreach( $submissions as $submission ) {
			// unserialize the data
			$signer = unserialize( $submission );
			// unserialize the data AGAIN, don't know why...
			$signer = unserialize( $signer );
			// you might want to change this part, but the default format look great with the CSS in this tutorial.
			$output .= '<li>';
			$output .= '<span class="submission_name">' . $signer['name'] . '</span>';
			$output .= '<span class="submission_date">' . $signer['date'] . '</span>';
			$output .= '</li>';
		}
	}
	$output .= '</ul>';

	return $output;
}
add_shortcode( 'petition_list', 'petition_list_sc' );

function petition_count_sc() {
	$petition_meta = get_post_custom_values( 'petition_submission' );
	return count( $petition_meta );
}
add_shortcode( 'petition_count', 'petition_count_sc' );