For saving some data of the last instruction in each column, to support IF-like and WHILE-like instructions.

Sample:

 		array(
 			// Some data of the IF instruction in the first column.
 			1 => array(
 				'name' => 'PhpMyCellScript.IF', // The full instruction name.
 				'row' => 1, // The row number of the instruction.
 				'is_while_like_instruction' => false, // Whether the instruction is a WHILE-like instruction.
 				'is_if_like_instruction' => true, // Whether the instruction is an IF-like instruction.
 				'entered_if_branch' => true // Whether the IF branch is entered.
 			),
 			// Some data of the WHILE instruction in the second column.
 			2 => array(
 				'name' => 'PhpMyCellScript.WHILE',
 				'row' => 2,
 				'is_while_like_instruction' => true,
 				'is_if_like_instruction' => false
 			),
 			// Some data of the ECHO instruction in the third column.
 			3 => array(
 				'name' => 'PhpMyCellScript\Addons\Example.ECHO',
 				'row' => 3,
 				'is_while_like_instruction' => false,
 				'is_if_like_instruction' => false
 			)
 		)

• access: public

The last row of the worksheet.

• access: public

Keep track of the row position of the current instruction.

• access: public

For caching worksheet cell values to improve performance.

• access: public