Display INFORMATION_SCHEMA.COLUMNS results in a string - php

Question

First of all, english is not my first language so sorry if I make some mistakes. I am kinda new to PHP and MySQL and I am working on a little personal project. I am stuck on something that I really don't know how to do and I would like to have your opinions on the best way to do it.
I want to generate a file (using fwrite) that will contain this information :
class applications
{
private $_"value1";
private $_"value2";
private $_"value3";
etc depending on how many columns the table have
}
"value" are equal to the name of each columns of a table.
To get the columns names I am using INFORMATION_SCHEMA.COLUMNS in this request :
$columns = $db->prepare("SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = '$_POST[dropdown]' AND table_schema = 'tp2'");
$columns->execute();
$resultCol = $columns->fetchAll();
To write the file I am using this code :
$ouv = fopen($dir."/".$nomfile.".class.".$ext, 'w+');
fwrite($ouv, $text);
The variable $text must contain the result of a foreach loop that looks something like that :
foreach($resultCol as $value3)
{
print_r("private "."$"."_".$value3[0].";"."<br/>") ;
}
This print_r would work if I would like to display it in a php page but I need to save it as a string in a file.
Since $text is a variable, I can't use a foreach in it and I really don't know how to do it.
So in your opinion, what would be the best/easiest way to do what I am trying to do ?

Answer 1

Steps:
Open file
Loop through the result set
read row column values
construct text
write into file
close the file
Example:
$ouv = fopen( $dir . "/" . $nomfile . ".class." . $ext, 'w+' );
foreach( $resultCol as $value3 )
{
$text = "private $_" . $value3[0] . ";" ;
fwrite( $ouv, $text );
}
fclose( $ouv );