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assign javascript value to php variable in javascript function

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What Is PHP Programming?

Want to learn more about what makes the web run? PHP is a programming language used for server-side web development. If this doesn’t make sense to you, or if you still aren’t quite sure what PHP programming is for, keep reading to learn more.

Understanding PHP

Web development topics can be pretty complicated for people who aren’t at least a little bit familiar with them, so it’s best to start with a simple explanation. In short, PHP is a server-side coding language that uses a format known as scripting. PHP is or has been behind some of the largest web businesses in the world, including Facebook and WordPress.

The Two Sides of Web Programming

The average website or app user doesn’t necessarily think that much about what goes on when they click a button, enter text in a box or scroll through results pages. Just a little bit of typing or clicking and information appears like magic. Of course, it isn’t magic. The clicking, scrolling and typing you do on the visible portion of a webpage is interaction with the website’s front end, or client side. All of the behind-the-scenes communication between different servers to retrieve and display information happens on the back end, or server side. PHP, a back-end language, isn’t about making things look nice the way front-end languages like CSS are.

Other Server-Side Languages

PHP is not the only server-side programming language out there. Others, like Ruby and Python, may be equally or more important in different situations. If you really want to gain an understanding of what PHP does and why, it may make sense to study up on these other languages as well. That doesn’t necessarily mean you need to master all three, but understanding the general function of server-side languages can provide extra context for PHP.

How to Learn PHP

Learning PHP requires some familiarity with how computer code and programming languages work. You can dive right into a free or paid PHP tutorial, but if you aren’t at least a little bit tech literate, you may be out of your depth. Tutorials often recommend that you learn HTML and CSS first. Learning PHP takes time and patience as you’ll need to not only understand the specifics of the language but also the tech jargon that surrounds it.

What Can You Do With PHP?

As a server-side language, PHP can allow you to do a lot of important work on a website’s back end. No, that’s not a double entendre. Back-end development is the process of building the unseen architecture that allows a website or app to function. For example, if you log into your bank account using a secure password, there’s a part of that transaction you see (e.g., the text boxes labelled “username” and “password”) and a part you don’t see, which involves communication of your request to a server, which verifies your username and password, deems them valid and allows you to proceed. All of that unseen communication is a server-side or back-end activity. So if you’re interested in the nitty gritty of what makes the web run rather than worrying about making things look nice and make sense for users, PHP would be a good language to learn. You may also want to learn other server-side languages so you can boost your capabilities and maybe even get a job in the tech industry.

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assign javascript value to php variable in javascript function

Getenv() PHP Function

Using getenv() to retrieve an ip address or document root.

The getenv() function is used to retrieve the value of an environment variable in PHP . The getenv() function returns the value of a specified environment variable. The function follows the syntax getenv (varname). 

What Are Environment Variables

Environment variables are imported into the environment where the PHP code runs. You probably have more than one deployment of code: a local one for development and one in the cloud, each with different credentials. The environment variables for any two locations are different, so it makes sense not to include them in the main code.

Examples of the Getenv() Function

Below are some examples of environment variables you can use. These code examples retrieve an IP address, the admin's contact information, and the document root.

assign javascript value to php variable in javascript function

assign javascript value to php variable in javascript function

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how to assign javascript variable value to php variable [duplicate]

I have declared a javascript variable ,

And unable to assign that value to php variable;

I know Ajax may be the solution of my problem. But i don't know how to use Ajax and solve the problem.

Punit Gajjar's user avatar

11 Answers 11

Using Cookie is the better solution i think -

SM Ataul Karim Riad's user avatar

Try using ajax with jQuery.post() if you want a more dynamic assignment of variables.

The reason you can't assign a variable directly is because they are processed in different places.

It's like trying to add eggs to an already baked cake, instead you should send the egg to the bakery to get a new cake with the new eggs. That's what jQuery's post is made for.

Alert the results from requesting test.php with an additional payload of data (HTML or XML, depending on what was returned).

alejandroid's user avatar

PHP is server side language and JS is client side.best way to do this is create a cookie using javascript and then read that cookie in PHP

Sachith Wickramaarachchi's user avatar

I have a better solution: Here, in the .php file, I have a variable called javascriptVar . Now, I want to assign the value of javascriptVar to my php variable called phpVar . I do this by simply call javascript variable by document.writeln in the script tag.

Nazmul81's user avatar

I guess you can use cookies for it.

1) First add a cookie jquery plugin.

2) Then store that window width in a cookie variable.

3) Access your cookie in PHP like $_COOKIE['variable name'].

http://www.w3schools.com/php/php_cookies.asp

hizbul25's user avatar

Javascript will be interpreted in Client's browser and you can not assign it to PHP variable which is interpreted on SERVER .

Feasible Solution : You can submit the Javascript value via ajax or through form submit.

Dimag Kharab's user avatar

You should see these links:

Assign Javascript value to PHP variable

Passing Javascript vars to PHP

Or you can use AJAX request or POST and GET methods to achieve this.

Snippet below may helpful for you:

Community's user avatar

Use this code to solve your problem.

Santhosh Raj's user avatar

Please use this code and it will works fine in all cases.

Stephan Vierkant's user avatar

Not the answer you're looking for? Browse other questions tagged javascript php jquery html ajax or ask your own question .

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PHP 7 Tutorial

How to pass JavaScript variables to PHP?

You can easily get the JavaScript variable value on the same page in PHP. Try the following codeL.

Johar Ali

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assign javascript value to php variable in javascript function

How to pass the javascript value to a PHP variable?

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How to pass JavaScript variables to PHP ?

JavaScript is the client side and PHP is the server side script language. The way to pass a JavaScript variable to PHP is through a request.

Method 1: This example uses form element and GET/POST method to pass JavaScript variables to PHP. The form of contents can be accessed through the GET and POST actions in PHP. When the form is submitted, the client sends the form data in the form of a URL such as:

This type of URL is only visible if we use the GET action, the POST action hides the information in the URL.

Client Side:

Server Side(PHP): On the server side PHP page, we request for the data submitted by the form and display the result.

Method 2: Using Cookies to store information: Client Side: Use Cookie to store the information, which is then requested in the PHP page. A cookie named gfg is created in the code below and the value GeeksforGeeks is stored. While creating a cookie, an expire time should also be specified, which is 10 days for this case.

Server Side(PHP): On the server side, we request for the cookie by specifying the name gfg and extract the data to display it on the screen.

JavaScript is best known for web page development but it is also used in a variety of non-browser environments. You can learn JavaScript from the ground up by following this JavaScript Tutorial and JavaScript Examples .

PHP is a server-side scripting language designed specifically for web development. You can learn PHP from the ground up by following this PHP Tutorial and PHP Examples .

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Assign a Javascript variable to PHP variable

Why do we assign a javascript variable to a php variable .

There are many reasons why one might want to assign a Javascript variable to a PHP variable. Some possible reasons include:

-To pass data from Javascript to PHP (for example, to use PHP to process or store data that was entered into a form via Javascript)

-To make use of PHP's built-in functions and libraries from within Javascript

-To take advantage of PHP's faster execution speed when working with large data sets or complex algorithms.

Use document.cookie and $_COOKIE to assign a JS variable to a PHP variable

The document.cookie is used to store cookies in javascript and  $_COOKIE is a PHP superglobal variable that is used to access cookies. We will use document.cookie to store javascript variable value to a cookie and access it in PHP using $_COOKIE .

In the above code example:

user image

The first time you log in it doesn't work. If you reload the page everything is fine. This is because php will execute first only then the javascript.

How to store JavaScript variable value in PHP variable

assign javascript value to php variable in javascript function

In this tutorial, we will learn how to store a JavaScript variable value in PHP variable value.  Since one runs on the server side and one runs on the client side. Hope this tutorial will be useful for you and  I will try to make this tutorial easy to learn.

JavaScript Variable into PHP variable

Suppose we have JavaScript and PHP live in the same document, then PHP will be executed first and we know it is executed on the server side and the JavaScript will be executed second and we know that it will be executed on the browser side. In this way, both will never interact.

Let’s understand with an example.

Suppose I declare a JavaScript variable and I am unable to assign that value to PHP. This can be directly resolved using Ajax. But the problem is I don’t know Ajax.

Using Ajax:

The most ideal way to pass the JavaScript variable value in the PHP variable is to pass the JS variable to an AJAX call. But to do this we need to reload the page with the variable in a $_GET parameter and access the variable in PHP using $_GET[‘a’].

Now your page will reload

Also Read:  How to remove a specific value from an array in PHP

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JS Tutorial

Js versions, js functions, js html dom, js browser bom, js web apis, js vs jquery, js graphics, js examples, js references, javascript variables, 4 ways to declare a javascript variable:.

What are Variables?

Variables are containers for storing data (storing data values).

In this example, x , y , and z , are variables, declared with the var keyword:

In this example, x , y , and z , are variables, declared with the let keyword:

In this example, x , y , and z , are undeclared variables:

From all the examples above, you can guess:

When to Use JavaScript var?

Always declare JavaScript variables with var , let , or const .

The var keyword is used in all JavaScript code from 1995 to 2015.

The let and const keywords were added to JavaScript in 2015.

If you want your code to run in older browsers, you must use var .

When to Use JavaScript const?

If you want a general rule: always declare variables with const .

If you think the value of the variable can change, use let .

In this example, price1 , price2 , and total , are variables:

The two variables price1 and price2 are declared with the const keyword.

These are constant values and cannot be changed.

The variable total is declared with the let keyword.

This is a value that can be changed.

Just Like Algebra

Just like in algebra, variables hold values:

Just like in algebra, variables are used in expressions:

From the example above, you can guess that the total is calculated to be 11.

Variables are containers for storing values.

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JavaScript Identifiers

All JavaScript variables must be identified with unique names .

These unique names are called identifiers .

Identifiers can be short names (like x and y) or more descriptive names (age, sum, totalVolume).

The general rules for constructing names for variables (unique identifiers) are:

JavaScript identifiers are case-sensitive.

The Assignment Operator

In JavaScript, the equal sign ( = ) is an "assignment" operator, not an "equal to" operator.

This is different from algebra. The following does not make sense in algebra:

In JavaScript, however, it makes perfect sense: it assigns the value of x + 5 to x.

(It calculates the value of x + 5 and puts the result into x. The value of x is incremented by 5.)

The "equal to" operator is written like == in JavaScript.

JavaScript Data Types

JavaScript variables can hold numbers like 100 and text values like "John Doe".

In programming, text values are called text strings.

JavaScript can handle many types of data, but for now, just think of numbers and strings.

Strings are written inside double or single quotes. Numbers are written without quotes.

If you put a number in quotes, it will be treated as a text string.

Declaring a JavaScript Variable

Creating a variable in JavaScript is called "declaring" a variable.

You declare a JavaScript variable with the var or the let keyword:

After the declaration, the variable has no value (technically it is undefined ).

To assign a value to the variable, use the equal sign:

You can also assign a value to the variable when you declare it:

In the example below, we create a variable called carName and assign the value "Volvo" to it.

Then we "output" the value inside an HTML paragraph with id="demo":

It's a good programming practice to declare all variables at the beginning of a script.

One Statement, Many Variables

You can declare many variables in one statement.

Start the statement with let and separate the variables by comma :

A declaration can span multiple lines:

Value = undefined

In computer programs, variables are often declared without a value. The value can be something that has to be calculated, or something that will be provided later, like user input.

A variable declared without a value will have the value undefined .

The variable carName will have the value undefined after the execution of this statement:

Re-Declaring JavaScript Variables

If you re-declare a JavaScript variable declared with var , it will not lose its value.

The variable carName will still have the value "Volvo" after the execution of these statements:

You cannot re-declare a variable declared with let or const .

This will not work:

JavaScript Arithmetic

As with algebra, you can do arithmetic with JavaScript variables, using operators like = and + :

You can also add strings, but strings will be concatenated:

Also try this:

If you put a number in quotes, the rest of the numbers will be treated as strings, and concatenated.

Now try this:

JavaScript Dollar Sign $

Since JavaScript treats a dollar sign as a letter, identifiers containing $ are valid variable names:

Using the dollar sign is not very common in JavaScript, but professional programmers often use it as an alias for the main function in a JavaScript library.

In the JavaScript library jQuery, for instance, the main function $ is used to select HTML elements. In jQuery $("p"); means "select all p elements".

JavaScript Underscore (_)

Since JavaScript treats underscore as a letter, identifiers containing _ are valid variable names:

Using the underscore is not very common in JavaScript, but a convention among professional programmers is to use it as an alias for "private (hidden)" variables.

Test Yourself With Exercises

Create a variable called carName and assign the value Volvo to it.

Start the Exercise

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COMMENTS

  1. What Is PHP Programming?

    Want to learn more about what makes the web run? PHP is a programming language used for server-side web development. If this doesn’t make sense to you, or if you still aren’t quite sure what PHP programming is for, keep reading to learn mor...

  2. The Session_Start() Function in PHP

    The session_start() function is used at the beginning of all PHP pages that access the information contained in a session. In PHP, information designated for use across several web pages can be stored in a session. A session is similar to a...

  3. Uses for the Getenv() PHP Function

    Examples of how to use the getenv() command in PHP to get retrieve the value of an environment variable, such as the document root or an IP address. The getenv() function is used to retrieve the value of an environment variable in PHP. The ...

  4. how to assign javascript variable value to php variable [duplicate]

    <script type="text/javascript"> var width=screen.width; </script> <?php echo $myPhpVar= "

  5. How to pass JavaScript variables to PHP

    You can easily get the JavaScript variable value on the same page in PHP. Try the following codeL. <script> var res = "success";

  6. HTML : how to assign javascript variable value to php variable

    HTML : how to assign javascript variable value to php variable [ Beautify Your Computer : https://www.hows.tech/p/recommended.html ] HTML

  7. How to pass the javascript value to a PHP variable?

    Solution 1 · 1. Add a hidden field. HTML. <input type="hidden" id="btnClickedValue" name="btnClickedValue" value="" /> · 2. Store the button inner

  8. How to pass JavaScript variables to PHP ?

    JavaScript is the client side and PHP is the server side script language. The way to pass a JavaScript variable to PHP is through a request.

  9. Assign a Javascript variable to PHP variable

    Use document.cookie and $_COOKIE to assign a JS variable to a PHP variable · We have a Javascript variable named user_name that contains a string value. · We are

  10. How to store JavaScript variable value in PHP variable

    The most ideal way to pass the JavaScript variable value in the PHP variable is to pass the JS variable to an AJAX call. But to do this we need to reload the

  11. How to assign javascript variable to php variable? Other than Cookies

    + 8. The Javascript variables can be posted to the PHP page using HTTP POST or HTTP GET. · + 5. Kode Krasher It sounds like you had fun getting

  12. How do I send a JavaScript variable to PHP variable?

    You need to pass the variable to PHP code from html form through submitting a form using GET or POST methods. (Page need to be refreshed) · Use ajax to pass the

  13. JavaScript Variables

    If you re-declare a JavaScript variable declared with var , it will not lose its value. The variable carName will still have the value "Volvo" after the

  14. How to pass PHP variable value to javascript variable in view.edit

    Hi, If js you are writing in view.edit.php you can assign the value $type_of_account directly to a javascript varible.