How to convert object to array

# Converting Object to an Array

Finally, with ES2017, it’s official now! We have 3 variations to convert an Object to an Array 🎊

Array has an array of methods (sorry, bad pun 😝). So by converting the object into an array, you have access to all of that. Woohoo 🥳

# Time for a story.

# Ancient times

I always was so angry and wished there was a better way.

And then ES6 happened! My life changed! We finally have an easier way 🥳

Now, there was a built-in method that quickly turns all the keys in my object into an array:

Life was beautiful! But then I became angry again. Why can I only extract the keys, I want my values too! Humans always want more don’t we 😂 And then ES2017 rolled in.

# Object.values

Hi, I’m ES2017 and I grant you all your wish 🧞‍♀️. you can now easily extract the values into an array with one method.

# Object.entries

But ES2017 didn’t stop there. It gave me more! I grant you BOTH keys and values now, so stop being angry. I was blown away. It turned my frown upside down 😆

# Object.entries + Destructuring

But then I’m like. nested array 🤨. C’mon, that’s not fun to work with. ES6 swoops in and like, don’t worry! That’s why I gave you destructuring!

ES6, that’s why you are simply the best 💛

# End of story

Hope you enjoyed my code story-telling time 😂

Now go out there and have some fun with all these amazing Object methods 😊

# Browser Support

Polyfill

# But wait, there’s more.

Note: This is extremely new, so support will be limited. Keep this in your knowledge box, but maybe wait a bit longer before you put it in your actual toolbox 🧰

PHP object to array

Introduction to PHP object to array

The following article provides an outline for PHP object to array. As we all know, object is known as a class instance which has memory allocated. In the case of an array, it is a data structure containing one or more values of a similar type in a single name. On the other hand, an associative array is not like a normal PHP array. An associative array is an array that consists of a string index which stores item values linked with key values other than in order of the linear index.

Methods of a PHP object to array

Now, let us see different ways in which we can convert PHP object to array.

Web development, programming languages, Software testing & others

Method 1 – With the help of the json_decode and json_encode method.

In this method, the function json_decode takes JSON encoded string and changes it into a PHP variable, whereas the json_encode function returns a string which is encoded in a json format for a particular value.

Syntax:

Method 2 – With the help of type casting.

Typecasting is a technique in which one data type variable into the another data type. It is considered as an explicit data type conversion. It can translate a PHP object to an array with the help of typecasting rules in PHP.

Syntax:

How to Convert object to array in PHP?

As we all know, there are several formats of data like strings, objects, arrays etc. In the case of PHP also, there are data formats like this. In order to get the needed output, a php object obj result is needed in a format of an associative array.

Now, let us see how to translate a php object.

Code:

This is the skeleton for converting an object into an array.

Now let us see how to perform this.

When the object is var_dump, all items will be displayed.

Here, one important point to consider is json_decode that translates a json string to an object, except you offer another option that is boolean which can be true or false. Even if the second parameter is considered as true, an array will be obtained.

Also, when json encode operation and decode operation are used, arrays are converted to objects that take up many resources if the array is large. In that case, the better method to type cast an array to an object that uses the object cast.

Based on the requirements, you can choose the method you want for the conversion of an array into an object in PHP.

Examples of a PHP object to array

Different examples are mentioned below:

Example #1

PHP program to convert an object to an array using the typecasting method.

Code:

Output:

In this program, a class hospital is created, and inside that, three elements such as el1, el2, and el3. Then, a __construct() function is declared, which gets executed during the time object is created. Once this is done, the constructor takes parameters that are later offered during the object creation using the keyword “new”. From the program, it can be seen that objects get printed in the first case of expression var_dump(). But in the second case of expression, an object is casted into an array using the typecasting procedure.

Example #2

PHP program to convert an object to an array using json encode and json decode.

Code:

Output:

In this program also, a class hospital is created, and inside that, two elements such as el1 and el2, are created. Then, a __construct() function is declared, which gets executed during the time object is created. Once this is done, the constructor takes parameters that are later offered during the object creation using the keyword “new”. From the program, it can be seen that objects get printed in the first case of expression var_dump(). But in the second case of expression, an object is casted into an array using the typecasting procedure. Here, the first method in the method sections is used for converting an object into an array.

Conclusion

An associative array is an array that consists of a string index which stores item values linked with key values other than in order of the linear index. This article saw how PHP object to array is working, methods to achieve it, and different examples.

Recommended Articles

This is a guide to PHP object to array. Here we discuss the introduction, methods, how to convert object to array in PHP? and examples respectively. You may also have a look at the following articles to learn more –

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How to convert an Object <> to an Array [] of key-value pairs in JavaScript

I want to convert an object like this:

into an array of key-value pairs like this:

How can I convert an Object to an Array of key-value pairs in JavaScript?

19 Answers 19

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You can use Object.keys() and map() to do this

The best way is to do:

The Object.entries function returns almost the exact output you’re asking for, except the keys are strings instead of numbers.

If you need the keys to be numbers, you could map the result to a new array with a callback function that replaces the key in each pair with a number coerced from it.

I use an arrow function and Object.assign for the map callback in the example above so that I can keep it in one instruction by leveraging the fact that Object.assign returns the object being assigned to, and a single instruction arrow function’s return value is the result of the instruction.

This is equivalent to:

As mentioned by @TravisClarke in the comments, the map function could be shortened to:

However, that would create a new array for each key-value pair, instead of modifying the existing array in place, hence doubling the amount of key-value pair arrays created. While the original entries array is still accessible, it and its entries will not be garbage collected.

Now, even though using our in-place method still uses two arrays that hold the key-value pairs (the input and the output arrays), the total number of arrays only changes by one. The input and output arrays aren’t actually filled with arrays, but rather references to arrays and those references take up a negligible amount of space in memory.

You could go one step further and eliminate growth altogether by modifying the entries array in-place instead of mapping it to a new array:

How to convert JSON object to JavaScript array?

I need to convert JSON object string to a JavaScript array.

This my JSON object:

And I want to have:

How can I achieve this?

12 Answers 12

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If you have a well-formed JSON string, you should be able to do

I do this all the time when transfering arrays through AJAX.

Suppose you have:

You could get the values with (supported in practically all browser versions):

This will solve the problem:

In both the cases, output will be:

The above solutions do not work for nested objects. For nested objects, we can do something like this:

The output in this case will be:

You can insert object items to an array as this

if the goal is to create an array of objects, here is a solution that will accomplish what you’re trying to do using Object.keys():

Or using Object.entries()

Consider having a json object we want to convert

There is several solution you can use :

Theses functions convert any object to an array. One returns an array with all the keys, and the other all the values :

I’m not sure to understand the initial question, but the solution would probably be

This function is a mix of the two above:

It no use for the initial question, but this function is so usefull I had to mention it. Especially, when the value_ are nested object. Let say our values are objects like this :

and we want to end up with an array like this

We need to use Object.entries() to get all our key with their value. We will start with an overdetailed code :

We can make use of spread operator to simplify our code :

How can I convert the «arguments» object to an array in JavaScript?

It’s trivially easy to construct a new array from an arguments object with a simple for loop. For example, this function sorts its arguments:

However, this is a rather pitiful thing to have to do simply to get access to the extremely useful JavaScript array functions. Is there a built-in way to do it using the standard library?

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ES6 using rest parameters

If you are able to use ES6 you can use:

As you can read in the link

The rest parameter syntax allows us to represent an indefinite number of arguments as an array.

ES6 using Array.from()

Using Array.from:

Array.from simply convert Array-like or Iterable objects into Array instances.

You can actually just use Array ‘s slice function on an arguments object, and it will convert it into a standard JavaScript array. You’ll just have to reference it manually through Array’s prototype:

Why does this work? Well, here’s an excerpt from the ECMAScript 5 documentation itself:

NOTE: The slice function is intentionally generic; it does not require that its this value be an Array object. Therefore it can be transferred to other kinds of objects for use as a method. Whether the slice function can be applied successfully to a host object is implementation-dependent.

Therefore, slice works on anything that has a length property, which arguments conveniently does.

If Array.prototype.slice is too much of a mouthful for you, you can abbreviate it slightly by using array literals:

However, I tend to feel that the former version is more explicit, so I’d prefer it instead. Abusing the array literal notation feels hacky and looks strange.