Different ways of customizing the WordPress comment form

custom_comments.php

<?php

// Customized the comment form fields ( not the comment text area )
add_filter('comment_form_default_fields', 'my_comment_form_args');

// Customizes the text area - you have to do this here, rather than in comment_form_default_fields
add_filter('comment_form_field_comment', 'my_comment_form_field_comment');

// Customized the comment notes above the form fields
add_filter( 'comment_form_defaults', 'my_comment_form_defaults' );

// Customize the comments title
add_filter('comment_form_defaults','my_comment_form_title');

// Show the comments count in the comments title ( Genesis Child Theme )
add_filter( 'genesis_title_comments', 'sp_genesis_title_comments' )

/**
 * Customize the text prior to the comment form fields
 * @param  array $defaults
 * @return $defaults
 */
function my_comment_form_defaults($defaults) {

	$defaults['comment_notes_before'] = '<p class="comment-notes">'. __( 'Your email address will not be published. Required fields are marked','my-text-domain' ).'</p>';

	return $defaults;

}

/**
 * Customize the Comments form title
 * @param array $args
 * @return $args
 */
function my_comment_form_title ($defaults) {

	$defaults['title_reply'] = __( 'Post a new comment','my-text-domain' );

	return $defaults;

}

/**
 * Modify the comment form input fields
 * @param  $args http://codex.wordpress.org/Function_Reference/comment_form
 * $args['author']
 * $args['email']
 * $args['url']
 * 
 * @return $args
 */
function my_comment_form_args($args) {

	$args['author'] = '<p class="comment-form-author"><input id="author" name="author" type="text" value="' . esc_attr( $commenter['comment_author'] ) . '" size="40" tabindex="1" aria-required="true" title="'. __( 'Your Name (required)','my-text-domain' ) .'" placeholder="'. __( 'Your Name (required)','my-text-domain' ) .'" required /><!-- .comment-form-author .form-section --></p>';
	$args['email'] = '<p class="comment-form-email"><input id="email" name="email" type="email" value="' . esc_attr( $commenter['comment_author_email'] ) . '" size="40" tabindex="2" aria-required="true" title="'. __( 'Email Address (required)','my-text-domain' ) .'" placeholder="'. __( 'Email Address (required)','my-text-domain' ) .'" required /><!-- .comment-form-email .form-section --></p>';
	$args['url'] = '<p class="comment-form-url"><input id="url" name="url" type="url" value="' . esc_attr( $commenter['comment_author_url'] ) . '" size="40" tabindex="3" aria-required="false" title="'. __( 'Website (url)','my-text-domain' ) .'" placeholder="'. __( 'Website (url)','my-text-domain' ) .'" required /><!-- .comment-form-url .form-section --></p>';

	return $args;
}

/**
 * Customize the comment form comment field
 * @param  string $field
 * @return string
 */
function my_comment_form_field_comment($field) {

	$field = '<p class="comment-form-comment"><textarea id="comment" name="comment" cols="45" rows="8" tabindex="4" title="' . __( 'Comment','my-text-domain' ) . '" placeholder="' . __( 'Comment','my-text-domain' ) . '" aria-required="true"></textarea><!-- #form-section-comment .form-section --></p>';

	return $field;

}

/**
 * Show how many comments there are in the commments title
 * @return string $title
 */
function sp_genesis_title_comments() {

	global $post;
	$comment_count = wp_count_comments( $post->ID )->approved;
	$title = '<p class="comments_title"><b>'. __( 'Comments','austin' ) .' ('. $comment_count .')</b></p>';

	return $title;

}

anyother comment box code available for my website please help me tnpsc exams

Would you be able to enter a code that would check if the email address provided in the form is the one used and if it is not on spam blacklists?