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Editing: checkbox.php

<?php
/**
** A base module for [checkbox], [checkbox*], and [radio]
**/

/* form_tag handler */

add_action( 'wpcf7_init', 'wpcf7_add_form_tag_checkbox', 10, 0 );

function wpcf7_add_form_tag_checkbox() {
	wpcf7_add_form_tag( array( 'checkbox', 'checkbox*', 'radio' ),
		'wpcf7_checkbox_form_tag_handler',
		array(
			'name-attr' => true,
			'selectable-values' => true,
			'multiple-controls-container' => true,
		)
	);
}

function wpcf7_checkbox_form_tag_handler( $tag ) {
	if ( empty( $tag->name ) ) {
		return '';
	}

$validation_error = wpcf7_get_validation_error( $tag->name );

$class = wpcf7_form_controls_class( $tag->type );

if ( $validation_error ) {
		$class .= ' wpcf7-not-valid';
	}

$label_first = $tag->has_option( 'label_first' );
	$use_label_element = $tag->has_option( 'use_label_element' );
	$exclusive = $tag->has_option( 'exclusive' );
	$free_text = $tag->has_option( 'free_text' );
	$multiple = false;

if ( 'checkbox' == $tag->basetype ) {
		$multiple = ! $exclusive;
	} else { // radio
		$exclusive = false;
	}

if ( $exclusive ) {
		$class .= ' wpcf7-exclusive-checkbox';
	}

$atts = array();

$atts['class'] = $tag->get_class_option( $class );
	$atts['id'] = $tag->get_id_option();

if ( $validation_error ) {
		$atts['aria-describedby'] = wpcf7_get_validation_error_reference(
			$tag->name
		);
	}

$tabindex = $tag->get_option( 'tabindex', 'signed_int', true );

if ( false !== $tabindex ) {
		$tabindex = (int) $tabindex;
	}

$html = '';
	$count = 0;

if ( $data = (array) $tag->get_data_option() ) {
		if ( $free_text ) {
			$tag->values = array_merge(
				array_slice( $tag->values, 0, -1 ),
				array_values( $data ),
				array_slice( $tag->values, -1 ) );
			$tag->labels = array_merge(
				array_slice( $tag->labels, 0, -1 ),
				array_values( $data ),
				array_slice( $tag->labels, -1 ) );
		} else {
			$tag->values = array_merge( $tag->values, array_values( $data ) );
			$tag->labels = array_merge( $tag->labels, array_values( $data ) );
		}
	}

$values = $tag->values;
	$labels = $tag->labels;

$default_choice = $tag->get_default_option( null, array(
		'multiple' => $multiple,
	) );

$hangover = wpcf7_get_hangover( $tag->name, $multiple ? array() : '' );

foreach ( $values as $key => $value ) {
		if ( $hangover ) {
			$checked = in_array( $value, (array) $hangover, true );
		} else {
			$checked = in_array( $value, (array) $default_choice, true );
		}

if ( isset( $labels[$key] ) ) {
			$label = $labels[$key];
		} else {
			$label = $value;
		}

$item_atts = array(
			'type' => $tag->basetype,
			'name' => $tag->name . ( $multiple ? '[]' : '' ),
			'value' => $value,
			'checked' => $checked ? 'checked' : '',
			'tabindex' => false !== $tabindex ? $tabindex : '',
		);

$item_atts = wpcf7_format_atts( $item_atts );

if ( $label_first ) { // put label first, input last
			$item = sprintf(
				'<span class="wpcf7-list-item-label">%1$s</span><input %2$s />',
				esc_html( $label ), $item_atts
			);
		} else {
			$item = sprintf(
				'<input %2$s /><span class="wpcf7-list-item-label">%1$s</span>',
				esc_html( $label ), $item_atts
			);
		}

if ( $use_label_element ) {
			$item = '<label>' . $item . '</label>';
		}

if ( false !== $tabindex
		and 0 < $tabindex ) {
			$tabindex += 1;
		}

$class = 'wpcf7-list-item';
		$count += 1;

if ( 1 == $count ) {
			$class .= ' first';
		}

if ( count( $values ) == $count ) { // last round
			$class .= ' last';

if ( $free_text ) {
				$free_text_name = $tag->name . '_free_text';

$free_text_atts = array(
					'name' => $free_text_name,
					'class' => 'wpcf7-free-text',
					'tabindex' => false !== $tabindex ? $tabindex : '',
				);

if ( wpcf7_is_posted()
				and isset( $_POST[$free_text_name] ) ) {
					$free_text_atts['value'] = wp_unslash(
						$_POST[$free_text_name] );
				}

$free_text_atts = wpcf7_format_atts( $free_text_atts );

$item .= sprintf( ' <input type="text" %s />', $free_text_atts );

$class .= ' has-free-text';
			}
		}

$item = '<span class="' . esc_attr( $class ) . '">' . $item . '</span>';
		$html .= $item;
	}

$atts = wpcf7_format_atts( $atts );

$html = sprintf(
		'<span class="wpcf7-form-control-wrap %1$s"><span %2$s>%3$s</span>%4$s</span>',
		sanitize_html_class( $tag->name ), $atts, $html, $validation_error
	);

return $html;
}

/* Validation filter */

add_filter( 'wpcf7_validate_checkbox',
	'wpcf7_checkbox_validation_filter', 10, 2 );
add_filter( 'wpcf7_validate_checkbox*',
	'wpcf7_checkbox_validation_filter', 10, 2 );
add_filter( 'wpcf7_validate_radio',
	'wpcf7_checkbox_validation_filter', 10, 2 );

function wpcf7_checkbox_validation_filter( $result, $tag ) {
	$name = $tag->name;
	$is_required = $tag->is_required() || 'radio' == $tag->type;
	$value = isset( $_POST[$name] ) ? (array) $_POST[$name] : array();

if ( $is_required and empty( $value ) ) {
		$result->invalidate( $tag, wpcf7_get_message( 'invalid_required' ) );
	}

return $result;
}

/* Tag generator */

add_action( 'wpcf7_admin_init',
	'wpcf7_add_tag_generator_checkbox_and_radio', 30, 0 );

function wpcf7_add_tag_generator_checkbox_and_radio() {
	$tag_generator = WPCF7_TagGenerator::get_instance();
	$tag_generator->add( 'checkbox', __( 'checkboxes', 'contact-form-7' ),
		'wpcf7_tag_generator_checkbox' );
	$tag_generator->add( 'radio', __( 'radio buttons', 'contact-form-7' ),
		'wpcf7_tag_generator_checkbox' );
}

function wpcf7_tag_generator_checkbox( $contact_form, $args = '' ) {
	$args = wp_parse_args( $args, array() );
	$type = $args['id'];

if ( 'radio' != $type ) {
		$type = 'checkbox';
	}

if ( 'checkbox' == $type ) {
		$description = __( "Generate a form-tag for a group of checkboxes. For more details, see %s.", 'contact-form-7' );
	} elseif ( 'radio' == $type ) {
		$description = __( "Generate a form-tag for a group of radio buttons. For more details, see %s.", 'contact-form-7' );
	}

$desc_link = wpcf7_link( __( 'https://contactform7.com/checkboxes-radio-buttons-and-menus/', 'contact-form-7' ), __( 'Checkboxes, radio buttons and menus', 'contact-form-7' ) );

?>
<div class="control-box">
<fieldset>
<legend><?php echo sprintf( esc_html( $description ), $desc_link ); ?></legend>

</tbody>
</table>
</fieldset>
</div>

<div class="insert-box">
	<input type="text" name="<?php echo $type; ?>" class="tag code" readonly="readonly" onfocus="this.select()" />

<p class="description mail-tag"><label for="<?php echo esc_attr( $args['content'] . '-mailtag' ); ?>"><?php echo sprintf( esc_html( __( "To use the value input through this field in a mail field, you need to insert the corresponding mail-tag (%s) into the field on the Mail tab.", 'contact-form-7' ) ), '<strong><span class="mail-tag"></span></strong>' ); ?><input type="text" class="mail-tag code hidden" readonly="readonly" id="<?php echo esc_attr( $args['content'] . '-mailtag' ); ?>" /></label></p>
</div>
<?php
}

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