Blog Crashed with Parse error: syntax error

I updated photolab theme and blog crashed, this is the message:

Parse error: syntax error, unexpected T_FUNCTION in /home/content/18/5019418/html/blog/wp-content/themes/photolab/inc/tools.php on line 28

This is the code of tools.php :

<?php

class Tools{

/**
* Join array to string
* @param array $arr — array like ‘key’ => ‘value’
* @return string — joined string
*/
public static function join($arr = array())
{
$arr = self::removeEmpty($arr);
$result = array();
foreach ($arr as $key => $value)
{
$result[] = sprintf(‘%s=”%s”‘, $key, $value);
}
return implode(‘ ‘, $result);
}

/**
* Remove empty elements
* @param array $arr — array with empty elements
* @return array — array without empty elements
*/
public static function removeEmpty($arr)
{
return array_filter($arr, function($var) { return $var != ”; });
}

/**
* Lave just right keys in array
* @param array $right_keys — right keys array
* @param array $arr — array to sanitize
* @return array — sanitized array
*/
public static function leaveRightKeys($right_keys, $arr)
{
if(count($arr))
{
foreach ($arr as $key => $value)
{
if(!in_array($key, $right_keys)) unset($arr[$key]);
}
}
return $arr;
}

/**
* Leave keys from array
* @param array $remove_keys — kyes to remove
* @param array $arr — array from we need remove these keys
* @return array — sanitized array
*/
public static function removeKeys($remove_keys, $arr)
{
if(count($remove_keys))
{
foreach ($remove_keys as $key => $value)
{
if(array_key_exists($value, $arr)) unset($arr[$value]);
}
}
return $arr;
}

/**
* Get key or return empty string
* @param string $key — key name
* @param array $arr — array to check key
* @param mixed $default — default value
* @return mixed — key
*/
public static function tryGet($key, $arr, $default = ”)
{
if(array_key_exists($key, $arr)) return $arr[$key];
return $default;
}

/**
* Render your view
* @param string $view_name — view name
* @param array $variables — variables to extract in rendering View
* @return string — HTML code
*/
public static function renderView($view_name, $variables = array())
{
extract($variables);
ob_start();
include sprintf(‘views/%s.php’, $view_name);
return ob_get_clean();
}

/**
* Render select control
* @param array $values — options for select ctrl
* @param string $attributes — attributes to
* @return string — HTML code
*/
public static function renderSelectControl($values, $attributes = array())
{
$attributes = array_merge(array(‘value’ => ”), $attributes);
return self::renderView(
‘select_control’,
array(
‘attributes’ => $attributes,
‘values’ => $values
)
);
}
}

This is the line 28:

return array_filter($arr, function($var) { return $var != ”; });

Please help me to correct this syntax error as soon as possible. Thank you!