检索注释表单字段的最大字符长度。

原型

wp_get_comment_fields_max_lengths()

返回值

(array)  注释表单字段的最大字符长度。

源文件

路径:wp-includes/comment.php

<?php
...
function wp_get_comment_fields_max_lengths() {
	global $wpdb;
	$lengths = array(
		'comment_author'       => 245,
		'comment_author_email' => 100,
		'comment_author_url'   => 200,
		'comment_content'      => 65525,
	);
	if ( $wpdb->is_mysql ) {
		foreach ( $lengths as $column => $length ) {
			$col_length = $wpdb->get_col_length( $wpdb->comments, $column );
			$max_length = 0;
			// No point if we can't get the DB column lengths
			if ( is_wp_error( $col_length ) ) {
				break;
			}
			if ( ! is_array( $col_length ) && (int) $col_length > 0 ) {
				$max_length = (int) $col_length;
			} elseif ( is_array( $col_length ) && isset( $col_length['length'] ) && intval( $col_length['length'] ) > 0 ) {
				$max_length = (int) $col_length['length'];
				if ( ! empty( $col_length['type'] ) && 'byte' === $col_length['type'] ) {
					$max_length = $max_length - 10;
				}
			}
			if ( $max_length > 0 ) {
				$lengths[ $column ] = $max_length;
			}
		}
	}
	/**
	 * Filters the lengths for the comment form fields.
	 *
	 * @since 4.5.0
	 *
	 * @param array $lengths Associative array `'field_name' => 'maximum length'`.
	 */
	return apply_filters( 'wp_get_comment_fields_max_lengths', $lengths );
}
...
?>

其他

英文文档:https://developer.wordpress.org/reference/functions/wp_get_comment_fields_max_lengths/