Phpunderscore code error.

{Code...} function ($ val) {code comes from phpunderscore. An error is reported in this area and it seems that no parameter can be set.

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

Function ($ val ){

The Code comes from php underscore. An error is reported in this area and it does not seem to support parameters.

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

Function ($ val ){

The Code comes from php underscore. An error is reported in this area and it does not seem to support parameters.

function ($val) {

This method is used to write lambda functions (anonymous functions). It is often used in js and other scripting languages. However, this anonymous function has been supported since php 5.3. So the problem you encounter is that the php version is not enough. upgrade to the latest version of php 5.3.x to solve this problem.