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  1. Cyber

    Php Arrays

    Simple arrays Arrays are a special type of variable that can contain many variables, and hold them in a list. For example, let's say we want to create a list of all the odd numbers between 1 and 10. Once we create the list, we can assign new variables that will refer to a variable in the array, using the index of the variable. To use the first variable in the list (in this case the number 1), we will need to give the first index, which is 0, since PHP uses zero based indices, like almost all programming languages today. $odd_numbers = [1,3,5,7,9]; $first_odd_number = $odd_numbers[0]; $second_odd_number = $odd_numbers[1]; echo "The first odd number is $first_odd_number\n"; echo "The second odd number is $second_odd_number\n"; We can now add new variables using an index. To add an item to the end of the list, we can assign the array with index 5 (the 6th variable): $odd_numbers = [1,3,5,7,9]; $odd_numbers[5] = 11; print_r($odd_numbers); Arrays can contain different types of variables according to your needs, and can even contain other arrays or objects as members. To delete an item from an array, use the unset function on the member itself. For example: $odd_numbers = [1,3,5,7,9]; unset($odd_numbers[2]); // will remove the 3rd item (5) from the list print_r($odd_numbers); Useful functions The count function returns the number of members an array has. $odd_numbers = [1,3,5,7,9]; echo count($odd_numbers); The reset function gets the first member of the array. (It also resets the internal iteration pointer). $odd_numbers = [1,3,5,7,9]; $first_item = reset($odd_numbers); echo $first_item; We can also use the index syntax to get the first member of the array, as follows: $odd_numbers = [1,3,5,7,9]; $first_item = $odd_numbers[0]; echo $first_item; The end function gets the last member of the array. $odd_numbers = [1,3,5,7,9]; $last_item = end($odd_numbers); echo $last_item; We can also use the count function to get the number of elements in the list, and then use it to refer to the last variable in the array. Note that we subtract one from the last index because indices are zero based in PHP, so we need to fix the fact that we don't count variable number zero. $odd_numbers = [1,3,5,7,9]; $last_index = count($odd_numbers) - 1; $last_item = $odd_numbers[$last_index]; echo $last_item; Stack and queue functions Arrays can be used as stacks and queues as well. To push a member to the end of an array, use the array_push function: $numbers = [1,2,3]; array_push($numbers, 4); // now array is [1,2,3,4]; // print the new array print_r($numbers); To pop a member from the end of an array, use the array_pop function: $numbers = [1,2,3,4]; array_pop($numbers); // now array is [1,2,3]; // print the new array print_r($numbers); To push a member to the beginning of an array, use the array_unshift function: $numbers = [1,2,3]; array_unshift($numbers, 0); // now array is [0,1,2,3]; // print the new array print_r($numbers); To pop a member from the beginning of an array, use the array_shift function: $numbers = [0,1,2,3]; array_shift($numbers); // now array is [1,2,3]; // print the new array print_r($numbers); Concatenating arrays We can use the array_merge to concatenate between two arrays: $odd_numbers = [1,3,5,7,9]; $even_numbers = [2,4,6,8,10]; $all_numbers = array_merge($odd_numbers, $even_numbers); print_r($all_numbers); Sorting arrays We can use the sort function to sort arrays. The rsort function sorts arrays in reverse. Notice that sorting is done on the input array and does not return a new array. $numbers = [4,2,3,1,5]; sort($numbers); print_r($numbers); Advanced array functions The array_slice function returns a new array that contains a certain part of a specific array from an offset. For example, if we want to discard the first 3 elements of an array, we can do the following: $numbers = [1,2,3,4,5,6]; print_r(array_slice($numbers, 3)); We can also decide to take a slice of a specific length. For example, if we want to take only two items, we can add another argument to the function: $numbers = [1,2,3,4,5,6]; print_r(array_slice($numbers, 3, 2)); The array_splice function does exactly the same, however it will also remove the slice returned from the original array (in this case, the numbers variable). $numbers = [1,2,3,4,5,6]; print_r(array_splice($numbers, 3, 2)); print_r($numbers);
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