Question

  Table
*------------------------------------------------*
|    id    |    title   |    filename            |
*------------------------------------------------*

Lets say this is the structure of the table. I want to update every single row of this table.

Lets say i want to replace every space in Filename with a underscore.

$new_filename = str_replace(" ", "_", $filename);

mysql_query("UPDATE table SET Filename = '$new_filename'");

This does not work. Each row has different Filename.

Answer 1

I would simply do this:

mysql_query("UPDATE table SET Filename = REPLACE(Filename, ' ', '_')");

This way you only execute one command and depending on your table size, this should be pretty quick

*edited