comment_exists( string $comment_author, string $comment_date, string $timezone = 'blog' )

Determine if a comment exists based on author and date.

Description

For best performance, use $timezone = 'gmt', which queries a field that is properly indexed. The default value for $timezone is ‘blog’ for legacy reasons.

Parameters

$comment_author

(Required) Author of the comment.

$comment_date

(Required) Date of the comment.

$timezone

(Optional) Timezone. Accepts 'blog' or 'gmt'. Default 'blog'.

Default value: 'blog'

Return

(mixed) Comment post ID on success.

Source

File: wp-admin/includes/comment.php 

function comment_exists( $comment_author, $comment_date, $timezone = 'blog' ) {
	global $wpdb;

	$date_field = 'comment_date';
	if ( 'gmt' === $timezone ) {
		$date_field = 'comment_date_gmt';
	}

	return $wpdb->get_var( $wpdb->prepare("SELECT comment_post_ID FROM $wpdb->comments
			WHERE comment_author = %s AND $date_field = %s",
			stripslashes( $comment_author ),
			stripslashes( $comment_date )
	) );
}

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Related

Uses

Uses
Uses Description
wp-includes/wp-db.php: wpdb::get_var()

Retrieve one variable from the database.
wp-includes/wp-db.php: wpdb::prepare()

Prepares a SQL query for safe execution. Uses sprintf()-like syntax.

Changelog

Changelog
Version Description
WP-4.4.0 Added the $timezone parameter.
WP-2.0.0 Introduced.