Tribe__Validate::options()
validates fields that have options (radios, dropdowns, etc.) by making sure the value is part of the options array
Source
File: src/Tribe/Validate.php
public function options() {
if ( array_key_exists( $this->value, $this->field['options'] ) ) {
$this->value = ( $this->value === 0 ) ? false : $this->value;
$this->result->valid = true;
} else {
$this->result->valid = false;
$this->result->error = sprintf( esc_html__( "%s must have a value that's part of its options.", 'tribe-common' ), $this->label );
}
}