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✏️ Editing: class-acf-admin-tool-import.php

<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

if ( ! class_exists( 'ACF_Admin_Tool_Import' ) ) :

class ACF_Admin_Tool_Import extends ACF_Admin_Tool {

/**
		 *  initialize
		 *
		 *  This function will initialize the admin tool
		 *
		 *  @date    10/10/17
		 *  @since   5.6.3
		 *
		 *  @param   n/a
		 *  @return  n/a
		 */

function initialize() {

// vars
			$this->name  = 'import';
			$this->title = __( 'Import Field Groups', 'acf' );
			$this->icon  = 'dashicons-upload';

}

/**
		 *  html
		 *
		 *  This function will output the metabox HTML
		 *
		 *  @date    10/10/17
		 *  @since   5.6.3
		 *
		 *  @param   n/a
		 *  @return  n/a
		 */

function html() {

?>
		<p><?php _e( 'Select the Advanced Custom Fields JSON file you would like to import. When you click the import button below, ACF will import the field groups.', 'acf' ); ?></p>
		<div class="acf-fields">
			<?php

acf_render_field_wrap(
				array(
					'label'    => __( 'Select File', 'acf' ),
					'type'     => 'file',
					'name'     => 'acf_import_file',
					'value'    => false,
					'uploader' => 'basic',
				)
			);

?>
		</div>
		<p class="acf-submit">
			<input type="submit" class="button button-primary" value="<?php _e( 'Import File', 'acf' ); ?>" />
		</p>
			<?php

}

/**
		 *  submit
		 *
		 *  This function will run when the tool's form has been submit
		 *
		 *  @date    10/10/17
		 *  @since   5.6.3
		 *
		 *  @param   n/a
		 *  @return  n/a
		 */

function submit() {

// Check file size.
			if ( empty( $_FILES['acf_import_file']['size'] ) ) {
				return acf_add_admin_notice( __( 'No file selected', 'acf' ), 'warning' );
			}

// Get file data.
			$file = $_FILES['acf_import_file'];

// Check errors.
			if ( $file['error'] ) {
				return acf_add_admin_notice( __( 'Error uploading file. Please try again', 'acf' ), 'warning' );
			}

// Check file type.
			if ( pathinfo( $file['name'], PATHINFO_EXTENSION ) !== 'json' ) {
				return acf_add_admin_notice( __( 'Incorrect file type', 'acf' ), 'warning' );
			}

// Read JSON.
			$json = file_get_contents( $file['tmp_name'] );
			$json = json_decode( $json, true );

// Check if empty.
			if ( ! $json || ! is_array( $json ) ) {
				return acf_add_admin_notice( __( 'Import file empty', 'acf' ), 'warning' );
			}

// Ensure $json is an array of groups.
			if ( isset( $json['key'] ) ) {
				$json = array( $json );
			}

// Remeber imported field group ids.
			$ids = array();

// Loop over json
			foreach ( $json as $field_group ) {

// Search database for existing field group.
				$post = acf_get_field_group_post( $field_group['key'] );
				if ( $post ) {
					$field_group['ID'] = $post->ID;
				}

// Import field group.
				$field_group = acf_import_field_group( $field_group );

// append message
				$ids[] = $field_group['ID'];
			}

// Count number of imported field groups.
			$total = count( $ids );

// Generate text.
			$text = sprintf( _n( 'Imported 1 field group', 'Imported %s field groups', $total, 'acf' ), $total );

// Add links to text.
			$links = array();
			foreach ( $ids as $id ) {
				$links[] = '<a href="' . get_edit_post_link( $id ) . '">' . get_the_title( $id ) . '</a>';
			}
			$text .= ' ' . implode( ', ', $links );

// Add notice
			acf_add_admin_notice( $text, 'success' );
		}
	}

// initialize
	acf_register_admin_tool( 'ACF_Admin_Tool_Import' );

endif; // class_exists check

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