How to create table with dynamic number of columns MYSQL - php

Question

I'm trying to create table in mysql.
There is $column_str which stores the names of the column.
If we have 3 columns it will be $columns_str="123", 4 columns -> $columns_str="1234"
So, I need to create table using variable $columns_str.
This code creates table1 with 1 column: "123":
$columns_str="123"; $table_name = table1;
$connection->query("CREATE TABLE `kcup`.`$table_name` ( `$columns_str` TEXT NOT NULL ) ENGINE = InnoDB;")
I need table with 3 columns: "1","2","3".
Help pls and thank you!

Answer 1

To create a table with three columns named 1, 2, and 3 when you have a variable $columns_str="123" you could use something like this;
<?php
$columns_str="123";
$table_name = 'table1';
$cols = str_split($columns_str);
$colQuery = '`id` int(11) NOT NULL AUTO_INCREMENT,';
foreach($cols as $col)
{
$colQuery .= "
`$col` TEXT NOT NULL,";
}
$colQuery .= "
PRIMARY KEY (`id`)";
$connection->query("CREATE TABLE `kcup`.`$table_name` ( $colQuery ) ENGINE = InnoDB;")
This would run the following SQL command;
CREATE TABLE `kcup`.`table1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`1` TEXT NOT NULL,
`2` TEXT NOT NULL,
`3` TEXT NOT NULL,
PRIMARY KEY (`id`)
) ENGINE = InnoDB;

Answer 2

You can't create a table with dynamics columns, but you can simulate it with a table like this one
ID FIELD VALUE
1 ID 4345
1 NAME PAUL
1 SURNAME SMITH
2 ID 4346
2 NAME MARC
2 SURNAME BROWN
The PK of that table is ID, FIELD
Addyng a new field is equivalent to add a new row.
So adding the field EMAIL is equivalent to add two rows (one for PAUL and one for MARC) and you will have the following records
ID FIELD VALUE
1 ID 4345
1 NAME PAUL
1 SURNAME SMITH
2 ID 4346
2 NAME MARC
2 SURNAME BROWN
1 EMAIL paul.smith#email.com
2 EMAIL marc.brown#email.com