how to define multidimensional array in php for multiple records

Welcome Sueet to eTI comunity.
Your query has been approved.

For you question: I generally prefer following format:
Say you have 2 classes with 4 student each with 5 subject marks for each :

Code:

$arr_records = array(
				'class1' => array(
								'student1' => array(
											'sub1' => 23,
											'sub2' =>44,
											'sub3' =>22,
											'sub4' =>24,
											),
								'student2' => array(
											'sub1' => 23,
											'sub2' =>25,
											'sub3' =>32,
											'sub4' =>24,
											),
								'student3' => array(
											'sub1' => 33,
											'sub2' =>20,
											'sub3' =>22,
											'sub4' =>27,
											),
								'student4' => array(
											'sub1' => 23,
											'sub2' =>20,
											'sub3' =>31,
											'sub4' =>24,
											),
								),
			'class1' => array(
								'student1' => array(
											'sub1' => 11,
											'sub2' =>41,
											'sub3' =>23,
											'sub4' =>24,
											),
								'student2' => array(
											'sub1' => 19,
											'sub2' =>18,
											'sub3' =>32,
											'sub4' =>24,
											),
								'student3' => array(
											'sub1' => 18,
											'sub2' =>17,
											'sub3' =>22,
											'sub4' =>27,
											),
								'student4' => array(
											'sub1' => 23,
											'sub2' =>41,
											'sub3' =>33,
											'sub4' =>24,
											),
							),
				);

I hope that helps.