Multi-dimensional arrays are such type of arrays which stores an another array at each index instead of single element. In other words, define multi-dimensional arrays as array of arrays. As the name suggests, every element in this array can be an array and they can also hold other sub-arrays within. Arrays or sub-arrays in multidimensional arrays can be accessed using multiple dimensions.
Dimensions: Dimensions of multidimensional array indicates the number of indices needed to select an element. For a two dimensional array two indices to select an element.
Two dimensional array: It is the simplest form of a multidimensional array. It can be created using nested array. These type of arrays can be used to store any type of elements, but the index is always a number. By default, the index starts with zero.
array ( array (elements...), array (elements...), ... )
Array (  => Array (  => Ankit  => Ram  => Shyam )  => Array (  => Unnao  => Trichy  => Kanpur ) )
Two dimensional associative array: Al associative array is similar to indexed array but instead of linear storage (indexed storage), every value can be assigned with a user-defined key of string type.
Display Marks: Array ( [Ankit] => Array ( [C] => 95 [DCO] => 85 [FOL] => 74 ) [Ram] => Array ( [C] => 78 [DCO] => 98 [FOL] => 46 ) [Anoop] => Array ( [C] => 88 [DCO] => 46 [FOL] => 99 ) )
Three Dimensional Array: It is the form of multidimensional array. Initialization in Three-Dimensional array is same as that of Two-dimensional arrays. The difference is as the number of dimension increases so the number of nested braces will also increase.
array ( array ( array (elements...), array (elements...), ... ), array ( array (elements...), array (elements...), ... ), ... )
Array (  => Array (  => Array (  => 1  => 2 )  => Array (  => 3  => 4 ) )  => Array (  => Array (  => 5  => 6 )  => Array (  => 7  => 8 ) ) )
Accessing multidimensional array elements: There are mainly two ways to access multidimensional array elements in PHP.
- Elements can be accessed using dimensions as array_name[‘first dimension’][‘second dimension’].
- Elements can be accessed using for loop.
- Elements can be accessed using for each loop.
95 95 85 74 78 98 46 88 46 99
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