How to use indexed array and associative array in PHP

Editor to share with you how to use indexed arrays and associative arrays in PHP. I believe most people don't know much about it, so share this article for your reference. I hope you can learn a lot after reading this article. Let's learn about it together.

PHP array

Arrays are special variables that can store one or more values in separate variable names.

If you have a list of items (such as a list of car brands), storing these brand names in a single variable looks like this:

$cars1= "Volvo"; $cars2= "BMW"; $cars3= "SAAB"

But what if you want to traverse the variable and find a specific value?

Or what if you need to store 300 car brands instead of 3? The solution is to create an array!

Arrays can store many values in a single variable name, and you can access a value by referencing the subscript.

Create an array in PHP

In PHP, the array () function is used to create an array. There are three array types in PHP:

Indexed array-an array with a numerical index

Associative array-an array with the specified key

Multidimensional array-an array containing one or more arrays

PHP indexed array

There are two ways to create an index array:

/ / the index is automatically assigned (the index starts at 0): $cars=array ("Volvo", "BMW", "SAAB"); / / or you can manually assign the index: $cars [0] = "Volvo"; $cars [1] = "BMW"; $cars [2] = "SAAB"; / / instance

Note: create an indexed array named $cars, assign it three elements, and then output a piece of text containing the values of the array.

Get the length of the array-count () function

The count () function returns the length (number of elements) of the array:

Traversing indexed array

To iterate through and output all the values of the indexed array, you can use a for loop, like this:

PHP associative array

An associative array is an array that uses the specified key that you assign to the array. There are two ways to create associative arrays:

/ / method 1:$age=array ("Peter" = > "35", "Ben" = > "37", "Joe" = > "43"); / / method 2:$age ["Peter"] = "35"; $age ["Ben"] = "37"; $age ["Joe"] = "43"; / / instance

Traversing associative array

To iterate through and output all the values of the associative array, you can use a foreach loop, like this:

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