Validate Phone Numbers in Contact Form 7
Checks Contact Form 7 phone fields for a realistic number of digits and only the characters phone numbers use, instead of accepting any text.
Opens WPIDE on
Code
$wpide_cf7_phone_min_digits = 7;
$wpide_cf7_phone_max_digits = 15;
$wpide_cf7_phone_check = function ( $result, $tag ) use ( $wpide_cf7_phone_min_digits, $wpide_cf7_phone_max_digits ) {
$phone = isset( $_POST[ $tag->name ] ) ? trim( (string) wp_unslash( $_POST[ $tag->name ] ) ) : '';
if ( '' === $phone ) {
return $result;
}
$digits = strlen( preg_replace( '/\D/', '', $phone ) );
if ( ! preg_match( '/^\+?[0-9\s().\-]+$/', $phone ) || $digits < $wpide_cf7_phone_min_digits || $digits > $wpide_cf7_phone_max_digits ) {
$result->invalidate( $tag, 'Please enter a valid phone number.' );
}
return $result;
};
add_filter( 'wpcf7_validate_tel', $wpide_cf7_phone_check, 20, 2 );
add_filter( 'wpcf7_validate_tel*', $wpide_cf7_phone_check, 20, 2 );Notes
Adjust the minimum and maximum digit counts for your country; spaces, dashes, dots, brackets and a leading + are always allowed.
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