What is the purpose of the file loadin.php in a web application?

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php配置文件加载：template_dir=/templates/smarty_compile_dir=/templates_c/smarty_config_dir=/configs/smarty_cache_dir=/cache/数据库连接：$dbh=new PDO(mysql:host=localhost;dbname=j14048025, j14048025, 14048025);执行设置字符集：$dbh->exec(set names utf8);

template_dir="./templates/"; $smarty->compile_dir="./templates_c/"; $smarty->config_dir ="./configs/"; $smarty->cache_dir = "./cache/"; $dbh=new PDO("mysql:host=localhost;dbname=j14048025","j14048025","14048025"); $dbh->exec("set names utf8"); $link=mysql_connect("localhost","j14048025","14048025"); mysql_select_db("j14048025"); mysql_query("set names utf8",$link); ?>