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Edit File: upgrade.php

<?php

add_action( 'wpcf7_upgrade', 'wpcf7_upgrade_58', 10, 2 );

/**
 * Runs functions necessary when upgrading from old plugin versions before 5.8.
 *
 * @since 5.8.0 New `_config_validation` post meta is introduced.
 */
function wpcf7_upgrade_58( $new_ver, $old_ver ) {
	if ( ! version_compare( $old_ver, '5.8-dev', '<' ) ) {
		return;
	}

$posts = WPCF7_ContactForm::find( array(
		'post_status' => 'any',
		'posts_per_page' => -1,
	) );

foreach ( $posts as $post ) {
		$post_id = $post->id();

// Delete the old post meta for config-validation results.
		delete_post_meta( $post_id, '_config_errors' );

// Add the contact form hash.
		add_post_meta( $post_id, '_hash',
			wpcf7_generate_contact_form_hash( $post_id ),
			true // Unique
		);
	}
}

add_action( 'wpcf7_upgrade', 'wpcf7_convert_to_cpt', 10, 2 );

/**
 * Converts old data in the dedicated database table to custom posts.
 *
 * @since 3.0.0 `wpcf7_contact_form` CPT is introduced.
 */
function wpcf7_convert_to_cpt( $new_ver, $old_ver ) {
	global $wpdb;

if ( ! version_compare( $old_ver, '3.0-dev', '<' ) ) {
		return;
	}

$old_rows = array();

$table_name = $wpdb->prefix . "contact_form_7";

if ( $wpdb->get_var( "SHOW TABLES LIKE '$table_name'" ) ) {
		$old_rows = $wpdb->get_results( "SELECT * FROM $table_name" );
	} elseif ( $opt = get_option( 'wpcf7' )
	and ! empty( $opt['contact_forms'] ) ) {
		foreach ( (array) $opt['contact_forms'] as $key => $value ) {
			$old_rows[] = (object) array_merge(
				$value,
				array( 'cf7_unit_id' => $key )
			);
		}
	}

foreach ( (array) $old_rows as $row ) {
		$q = "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_old_cf7_unit_id'"
			. $wpdb->prepare( " AND meta_value = %d", $row->cf7_unit_id );

if ( $wpdb->get_var( $q ) ) {
			continue;
		}

$postarr = array(
			'post_type' => 'wpcf7_contact_form',
			'post_status' => 'publish',
			'post_title' => maybe_unserialize( $row->title ),
		);

$post_id = wp_insert_post( $postarr );

if ( $post_id ) {
			update_post_meta( $post_id, '_old_cf7_unit_id', $row->cf7_unit_id );

$metas = array(
				'form',
				'mail',
				'mail_2',
				'messages',
				'additional_settings',
			);

foreach ( $metas as $meta ) {
				update_post_meta( $post_id, '_' . $meta,
					wpcf7_normalize_newline_deep( maybe_unserialize( $row->{$meta} ) )
				);
			}
		}
	}
}

add_action( 'wpcf7_upgrade', 'wpcf7_prepend_underscore', 10, 2 );

/**
 * Prepends an underscore to post meta keys.
 */
function wpcf7_prepend_underscore( $new_ver, $old_ver ) {
	if ( version_compare( $old_ver, '3.0-dev', '<' ) ) {
		return;
	}

if ( ! version_compare( $old_ver, '3.3-dev', '<' ) ) {
		return;
	}

$posts = WPCF7_ContactForm::find( array(
		'post_status' => 'any',
		'posts_per_page' => -1,
	) );

foreach ( $posts as $post ) {
		$props = $post->get_properties();

foreach ( $props as $prop => $value ) {
			if ( metadata_exists( 'post', $post->id(), '_' . $prop ) ) {
				continue;
			}

update_post_meta( $post->id(), '_' . $prop, $value );
			delete_post_meta( $post->id(), $prop );
		}
	}
}

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