How can i call html id in php?

Question

No matter what your backend language, all web pages end up as HTML for layout and content, CSS for display properties for that content, and optionally Javascript for any dynamic behavior once the page is downloaded by the browser.

Nội dung chính Show

Using The id Attribute
Difference Between Class and ID
HTML Bookmarks with ID and Links
Using The id Attribute in JavaScript
Chapter Summary
HTML Exercises
Test Yourself With Exercises
How can I use HTML ID in PHP?
Can I use ID in PHP?
Can you put HTML tags in PHP?
How can get HTML element value in PHP?

PHP, Ruby, C#, whatever - they all spit out those 3 things. To be a web developer is to understand how HTML+CSS+JS work, and then to understand how your server-side language generates those 3 things.

In PHP or any language, you'd output some HTML like so:

<div id="some-id">This is text I want to show</div>

And in your CSS file you'd have:

#some-id { display: none; }

Which would result in a page that when downloaded and rendered in a browser contains a DIV with text that's hidden. To make it visible when the user clicks something, you'd use jQuery or similar javascript language to attach an event handler like so:

$('#some-id')        // Grab the div
  .click(            // Add a click handler
    function() {     // Create a one time use function for the handler to call
      $(this).show();// Show the div
    }
  );

Client-side code is always in Javascript. Server-side code can be in one of many different languages. Your .NET experience has given you the wrong idea about how the web works, but it's not too late! :-) Good luck with it.

The HTML id attribute is used to specify a unique id for an HTML element.

You cannot have more than one element with the same id in an HTML document.

Using The id Attribute

The id attribute specifies a unique id for an HTML element. The value of the id attribute must be unique within the HTML document.

The id attribute is used to point to a specific style declaration in a style sheet. It is also used by JavaScript to access and manipulate the element with the specific id.

The syntax for id is: write a hash character (#), followed by an id name. Then, define the CSS properties within curly braces {}.

In the following example we have an <h2> element that points to the id name "myHeader". This <h2> element will be styled according to the #myHeader style definition in the head section:

Example

<!DOCTYPE html>
<html>
<head>
<style>
#myHeader {
background-color: lightblue;
color: black;
padding: 40px;
text-align: center;
}
</style>
</head>
<body>

<h2 id="myHeader">My Header</h2>

</body>
</html>

Try it Yourself »

Note: The id name is case sensitive!

Note: The id name must contain at least one character, cannot start with a number, and must not contain whitespaces (spaces, tabs, etc.).

Difference Between Class and ID

A class name can be used by multiple HTML elements, while an id name must only be used by one HTML element within the page:

Example

/* Style all elements with the class name "city" */
.city {
background-color: tomato;
color: white;
padding: 10px;
}
</style>

<h2 id="myHeader">My Cities</h2>

<h2 class="city">London</h2>
<p>London is the capital of England.</p>

<h2 class="city">Paris</h2>
<p>Paris is the capital of France.</p>

<h2 class="city">Tokyo</h2>
<p>Tokyo is the capital of Japan.</p>

Try it Yourself »

Tip: You can learn much more about CSS in our CSS Tutorial.

HTML Bookmarks with ID and Links

HTML bookmarks are used to allow readers to jump to specific parts of a webpage.

Bookmarks can be useful if your page is very long.

To use a bookmark, you must first create it, and then add a link to it.

Then, when the link is clicked, the page will scroll to the location with the bookmark.

Example

First, create a bookmark with the id attribute:

<h2 id="C4">Chapter 4</h2>

Then, add a link to the bookmark ("Jump to Chapter 4"), from within the same page:

Or, add a link to the bookmark ("Jump to Chapter 4"), from another page:

<a href="html_demo.html#C4">Jump to Chapter 4</a>

Using The id Attribute in JavaScript

The id attribute can also be used by JavaScript to perform some tasks for that specific element.

JavaScript can access an element with a specific id with the getElementById() method:

Example

Use the id attribute to manipulate text with JavaScript:

Try it Yourself »

Chapter Summary

The id attribute is used to specify a unique id for an HTML element
The value of the id attribute must be unique within the HTML document
The id attribute is used by CSS and JavaScript to style/select a specific element
The value of the id attribute is case sensitive
The id attribute is also used to create HTML bookmarks
JavaScript can access an element with a specific id with the getElementById() method

HTML Exercises

Test Yourself With Exercises

Exercise:

Add the correct HTML attribute to make the H1 element red.

<!DOCTYPE html>
<html>
<head>
<style>
#myheader {color:red;}
</style>
</head>
<body>

</body>
</html>

Start the Exercise

How can I use HTML ID in PHP?

You can use PHP DOM Extension..

PHP is server-side, which means it runs on a machine different from the user..

Javascript and HTML are client-side, which means they run on the user's machine..

Can I use ID in PHP?

A unique user ID can be created in PHP using the uniqid () function. This function has two parameters you can set. The first is the prefix, which is what will be appended to the beginning of each ID. The second is more_entropy.

Can you put HTML tags in PHP?

HTML in PHP tags. This method is especially useful if you have a lot of HTML code but want to also include PHP. As you can see, you can use any HTML you want without doing anything special or extra in your PHP file, as long as it's outside and separate from the PHP tags.