Method:walkRow row walker goes through one full row of data and executes a callback function per each cell in that row. 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. - Argument string |integer $row anything that is numeric is a valid row
identificator. As long as it is within the range of the currently loaded dataset - Argument string $callback the callback function to be executed
per each cell in a row - Visibility public
- Returns boolean
- false if callback does not exist
- false if row does not exits
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