array An array is the collection of elements an array is like a special variable which can hold more than one number or string at a time.array hold the key value of the data value. example: $arr_array = array(5,7,6,9,15); in the above $arr_array is the name of array variable and array hold the index number of the given value. type of array In a php ,there are basically two type of an array. 1- Numeric array 2- Associative array Numeric array numeric arrays are those array in which the indexes are in numeric form.the key of an numeric array are integer , begining at 0. example $arr_array(5,7,16,15,19); in a example index 0 hold the value 5 , index 1 hold the value 7 and so on till the value. Associative array associative array are those array which have indeces in string and character form. for example $arr_array = array( 'english=>65, 'hindi'=>25, 'math'=>75); In the above example the key is english,hindi and math that is hold the value.