Learn
Ordered Arrays
Review
We covered a lot in this lesson! Great job. Take a second to review everything you learned:
- Arrays are ordered collections of data that are a type of data structure fundamental to computer science.
- In PHP, we refer to this data structure as ordered arrays.
- The location of an element in an array is known as its index.
- The elements in an ordered array are arranged in ascending numerical order starting with index zero.
- We can construct ordered arrays with a built-in PHP function:
array()
. - We can construct ordered arrays with short array syntax, e.g.
[1,2,3]
. - We can print arrays using the built-in
print_r()
function or by converting them into strings using theimplode()
function. - We use square brackets (
[]
) to access elements in an array by their index. - We can add elements to the end of an array by appending square brackets (
[]
) to an array variable name and assigning the value with the assignment operator (=
). - We can change elements in an array using array indexing and the assignment operator.
- The
array_pop()
function removes the last element of an array. - The
array_push()
function adds elements to the end of an array. - The
array_shift()
function removes the first element of an array. - The
array_unshift()
function adds elements to the beginning of the array. - We can use chained square brackets (
[]
) to access and change elements within a nested array.
Instructions
We provided some example code for each of the core concepts covered in this lesson. Feel free to play around with the code to practice or experiment!