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<?php namespace Illuminate\Validation\Rules; use InvalidArgumentException; class RequiredIf { /** * The condition that validates the attribute. * * @var callable|bool */ public $condition; /** * Create a new required validation rule based on a condition. * * @param callable|bool $condition * @return void */ public function __construct($condition) { if (! is_string($condition)) { $this->condition = $condition; } else { throw new InvalidArgumentException('The provided condition must be a callable or boolean.'); } } /** * Convert the rule to a validation string. * * @return string */ public function __toString() { if (is_callable($this->condition)) { return call_user_func($this->condition) ? 'required' : ''; } return $this->condition ? 'required' : ''; } }