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:
- We can construct ordered arrays with short array syntax, e.g.
- We can print arrays using the built-in
print_r()function or by converting them into strings using the
- 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.
array_pop()function removes the last element of an array.
array_push()function adds elements to the end of an array.
array_shift()function removes the first element of an array.
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.
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!