foxpro, php : error => odbc_connect(): SQL error: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified...

class VFPConnect {
    var $dsn;
    var $conn;
    function __construct($db=""){
        $this->dsn = "Driver={Microsoft Visual FoxPro Driver};SourceType=DBF;SourceDB=".$db.";";
        $this->dsn .= "Exclusive=NO;collate=Machine;NULL=NO;DELETED=NO;BACKGROUNDFETCH=NO;";
        $this->conn = odbc_connect($this->dsn,'','');
    }
}

class VFPConn {
    var $conn;
    var $rs;
    function __construct($db_path,$sql){
        $this->conn = (new VFPConnect($db_path))->conn;
        $this->rs = odbc_exec($this->conn,$sql) or die("connect fail");
    }
    
    function close(){
        odbc_close($this->conn);
    }
}

require('../../php/connect.php');
$db = realpath('../../../../xxx/xx01');
$sql = "SELECT xxxx FROM xxxxx";
$conn = new VFPConn($db,$sql);
$rs = $conn->rs;
while(odbc_fetch_row($rs)){
    $pdf->SetXY(2,$nline+= 6);
    $pdf->Cell(40,10, odbc_result($rs,1));   
}
$rs->close();