PHP underscore code error, help to see

Return a copy of the array with falsy values removed public  function compact ($collection =null) {    list ($collecti ON) = Self::_wrapargs (Func_get_args (), 1);        $collection = Self::_collection ($collection);        $__ = new Self;    Return Self::_wrap ($__->select ($collection, function ($val) {      return (bool) $val;    }));  }

function ($val) {

Code from PHP underscore, this place error, does not seem to be able to do parameters.

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Return a copy of the array with falsy values removed public  function compact ($collection =null) {    list ($collecti ON) = Self::_wrapargs (Func_get_args (), 1);        $collection = Self::_collection ($collection);        $__ = new Self;    Return Self::_wrap ($__->select ($collection, function ($val) {      return (bool) $val;    }));  }

function ($val) {

Code from PHP underscore, this place error, does not seem to be able to do parameters.

function ($val) {

This notation is a function of lambda functions (anonymous functions), which used to appear in the scripting languages such as JS. However, starting with PHP 5.3, this anonymous function is supported. So you have a problem is not enough PHP version, upgrade to the latest version of PHP 5.3.x can solve this problem.

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