Is there a problem with the error in running the program?

<?php

class read
{
    private $data;

    function __construct()
    {
        if ($db = new DataBase()) {
            $this->data = $db->showData();
        }
    }

    function __toString()
    {
        $out = "";
        while ($this->data) {
            $out .= "<tr>";
            $out .= "</td>"".$this->data["id"].""</td>";
            $out .= "</td>"".$this->data["title"].""</td>";
            $out .= "</td>"".$this->data["u_id"].""</td>";
            $out .= "</td>"".$this->data["content"].""</td>";
            $out .= "</td>"".$this->data["time"].""</td>";
            $out .= "</tr>";
        }
        $out .= "</table></div>";
        return $out;
    }
}
Is there something wrong with this code? Running always goes wrong.

Php
Mar.12,2021 
 function __toString()
{
    $out = '';
    $out .= '<tr>';
    foreach($this->data as $v)
    {
        $out .= "</td>'".$v."'</td>";
    }
    $out .= '</tr>';
    $out .= '</table></div>';
    return $out;
}
while($row=mysql_fetch_row){
   //do something
}

this does not cause an endless loop because the mysql_fetch_row function automatically modifies the index value.

in addition, the code of the landlord does not need to use a loop at all.

Previous: Router.beforeEach

Next: How to use venv in python? What are the bin files for?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b35b24-2bfbc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35b24-2bfbc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?