Php execution delema

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PHP

Disregarding the errors, briefly explain what the code is doing.

<?php
//-------------- PHP Defaults for Application ---------------
$_SESSION["app_datasrc"]="login";
$_SESSION["app_name"]="acs;
$_SESSION["app_path"] = getcwd() ;
$_SESSION["app_img_path"] = getcwd() "\_images" ;
$_SESSION["app_access_log"] = getcwd()."\_logs\app_access.log";
//-------------------------------------------------------
?>

What I have tried:

I have tried identifying what the code is doing but I do not know.