php - Add column in MySQL with number of total columns as title -


how can add new column in table named "tische" column-title of total columns in table? tried following codem doesn't work...

<?php  //creating sql query   $number = "select count(*) information_schema.columns table_name = 'tische'"; $rs     = mysqli_query($number); $result = mysqli_fetch_array($rs); $add    = "alter table tische add column `$result` varchar(100) not null after zeit";  //importing our db connection script require_once('dbconnect.php');  //executing query database if (mysqli_query($con, $add)) {     echo 'element erfolgreich hinzugefügt'; } else {     echo 'fehler!'; } //closing database  mysqli_close($con);

when execute querys in console of phpmyadmin, works. not in php-script... please me

add require_once('dbconnect.php'); in page of top. add $con variable in mysqli_query first param $rs = mysqli_query($con, $number);

syntax of mysqli_query :

mysqli_query(mysqli $con , string $query [, int $resultmode = mysqli_store_result ])

your correction code bellow : 

<?php        //importing our db connection script     require_once('dbconnect.php');      //creating sql query       $number = "select count(*) total information_schema.columns table_name = 'tische'";     $rs = mysqli_query($con, $number);      $column_name = 0;     if(mysqli_num_rows($rs) > 0) {         while($result = mysqli_fetch_array($rs)) {             $column_name = $result['total'];         }          $add = "alter table tische add column `$column_name` varchar(100) not null after zeit";           //executing query database         if(mysqli_query($con,$add)){          echo 'element erfolgreich hinzugefügt';         } else {         echo 'fehler!';         }     }     //closing database      mysqli_close($con); ?>

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