syntax error - unexpected t_variable php -

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i have written simple php file on openshift. started simple operation (sql) , got following error:

[sun apr 06 11:59:35 2014] [error] [client 127.2.31.1] php parse error:  syntax error, unexpected t_variable in /var/lib/openshift/53413f4a500446a9c8000172/app-root/runtime/repo/test.php on line 15

here code:

<html> <head> </head> <body> <?php     echo 'start';     try{         $dbh=new pdo("mysql:host=$_env{'openshift_mysql_db_host'};dbname=$_env{'openshift_app_name'}",$_env{'openshift_mysql_db_username'},$_env{'openshift_mysql_db_password'}) or die('cannot connect db');//open mysql database connection         $dbh->setattribute(pdo::attr_errmode,pdo::errmode_exception);         $sth=$dbh->prepare('select * from fs where filename<>? and desc<>?');         $sth->execute(array('',''));         $result=$sth->fetchall(pdo::fetch_assoc);         print_r($result);     }catch(proexception $err){         echo $err->getmessage();     }     echo 'end'; ?> </body> </html>

i used php checker , reported same error in line15. can't figure out problem. help.

i believe error lies here:

}catch(proexception $err){

unless proexception defined previously, suggested vp_arth, meant pdoexception.

}catch(pdoexception $err){

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