Method:walkColumn

column walker

goes through the whole column and executes a callback for each one of the cells in it.

Note: callback functions get the value of the cell as an argument, and whatever that callback returns will be used to replace the current value of that cell.

1. Argument string $name the header name used to identify the column
2. Argument string $callback the callback function to be called per

each cell value

• Visibility public
• Returns boolean
• Also see getHeaders(), fillColumn(), appendColumn()