PHP MCQ Online Questions and Answers : PHP is the popular server-side scripting language. Knowledge of PHP language is now essential for dynamic web page development.

Table of Contents Show

Order Results
PHP Statements
Order Results
Order Results
Why can't i use PHP in HTML file?
How to integrate PHP with HTML?
How many ways you can embed PHP code in an HTML page?
Where to write PHP in HTML?

PHP can be used to generate dynamic web pages (i.e hundreds of different page contents using same template file) that helps us to edit, update and manange a bunch of web pages from a single master page. PHP can also handle files located on the server. Database (e.g MySql) records can also be read or updated using PHP code. Apart from that PHP can also be used to enhance online security by encrypting data. To revise the topic of PHP, please go through the selected list of important mcq questions on PHP with answer and practice them for your exams or interview.

Here you will find a list of common important questions on php programming in MCQ quiz style with answer for competitive exams and interviews. These frequently asked sample questions on PHP are given with correct choice of answer that you can check instantly. Presently we have added total 2 sets of questions on php programming for you to practice. We will keep adding more questions and provide this question bank in PDF format, so that you can download them instantly in E-book style.

Following section consists of some important multiple choice questions (mcq) on php programming GeneralKnowledge with answers.

Save the file and load it in your browser by filling out Bob’s form and clicking the Submit Order button. You should see something similar to the output shown in Figure 1.2.

Figure 1.2 Text passed to PHP’s echo construct is echoed to the browser

Notice how the PHP code you wrote was embedded inside a normal-looking HTML file. Try viewing the source from your browser. You should see this code

    Bob's Auto Parts - Order Results

Bob's Auto Parts

Order Results

Order processed.

None of the raw PHP is visible because the PHP interpreter has run through the script and replaced it with the output from the script. This means that from PHP you can produce clean HTML viewable with any browser; in other words, the user’s browser does not need to understand PHP.

This example illustrates the concept of server-side scripting in a nutshell. The PHP has been interpreted and executed on the web server, as distinct from JavaScript and other client-side technologies interpreted and executed within a web browser on a user’s machine.

The code that you now have in this file consists of four types of text:

HTML
PHP tags
PHP statements
Whitespace

You can also add comments.

Most of the lines in the example are just plain HTML.

PHP Tags

The PHP code in the preceding example began with and ended with ?>. This is similar to all HTML tags because they all begin with a less than (<) symbol and end with a greater than (>) symbol. These symbols ( and ?>) are called PHP tags. They tell the web server where the PHP code starts and finishes. Any text between the tags is interpreted as PHP. Any text outside these tags is treated as normal HTML. The PHP tags allow you to escape from HTML.

There are actually two styles of PHP tags; each of the following fragments of code is equivalent:

XML style
```
Order processed.'; ?>
```
This is the tag style that we use in this book; it is the preferred PHP tag style. The server administrator cannot turn it off, so you can guarantee it will be available on all servers, which is especially important if you are writing applications that may be used on different installations. This tag style can be used with Extensible Markup Language (XML) documents. In general, we recommend you use this tag style.
Short style

Order processed.'; ?>

This tag style is the simplest and follows the style of a Standard Generalized Markup Language (SGML) processing instruction. To use this type of tag—which is the shortest to type—you either need to enable the short_open_tag setting in your config file or compile PHP with short tags enabled. You can find more information on how to use this tag style in Appendix A. The use of this style is not recommended for use in code you plan to distribute. It will not work in many environments as it is no longer enabled by default.

PHP Statements

You tell the PHP interpreter what to do by including PHP statements between your opening and closing tags. The preceding example used only one type of statement:

echo 'Order processed.
';

As you have probably guessed, using the echo construct has a very simple result: It prints (or echoes) the string passed to it to the browser. In Figure 1.2, you can see the result is that the text Order processed. appears in the browser window.

Notice that there is a semicolon at the end of the echo statement. Semicolons separate statements in PHP much like periods separate sentences in English. If you have programmed in C or Java before, you will be familiar with using the semicolon in this way.

Leaving off the semicolon is a common syntax error that is easily made. However, it’s equally easy to find and to correct.

Whitespace

Spacing characters such as newlines (carriage returns), spaces, and tabs are known as whitespace. As you probably already know, browsers ignore whitespace in HTML, and so does the PHP engine. Consider these two HTML fragments:

Welcome to Bob's Auto Parts!

What would you like to order today?

and

Welcome to Bob's
Auto Parts!

What would you like
to order today?

These two snippets of HTML code produce identical output because they appear the same to the browser. However, you can and are encouraged to use whitespace sensibly in your HTML as an aid to humans—to enhance the readability of your HTML code. The same is true for PHP. You don’t need to have any whitespace between PHP statements, but it makes the code much easier to read if you put each statement on a separate line. For example,

echo 'hello ';
echo 'world';

and

echo 'hello ';echo 'world';

are equivalent, but the first version is easier to read.

Comments

Comments are exactly that: Comments in code act as notes to people reading the code. Comments can be used to explain the purpose of the script, who wrote it, why they wrote it the way they did, when it was last modified, and so on. You generally find comments in all but the simplest PHP scripts.

The PHP interpreter ignores any text in comments. Essentially, the PHP parser skips over the comments, making them equivalent to whitespace.

PHP supports C, C++, and shell script–style comments.

The following is a C-style, multiline comment that might appear at the start of a PHP script:

/* Author: Bob Smith
   Last modified: April 10
   This script processes the customer orders.
*/

Multiline comments should begin with a /* and end with */. As in C, multiline comments cannot be nested.

You can also use single-line comments, either in the C++ style:

    Bob's Auto Parts - Order Results

Bob's Auto Parts

Order Results

Order processed.

or in the shell script style:

    Bob's Auto Parts - Order Results

Bob's Auto Parts

Order Results

Order processed.

With both of these styles, everything after the comment symbol (# or //) is a comment until you reach the end of the line or the ending PHP tag, whichever comes first.

In the following line of code, the text before the closing tag, here is a comment, is part of a comment. The text after the closing tag, here is not, will be treated as HTML because it is outside the closing tag:

Why can't i use PHP in HTML file?

The first thing to know is that, by default, you can't use PHP in HTML files, meaning files that end with . html . It's possible to configure your server to allow PHP in . html files, but that's outside our scope—so for now, just remember that, if you want to write PHP, you want to be working with .

How to integrate PHP with HTML?

You can add PHP tags to your HTML Page. You simply need to enclose the PHP code with the PHP starts tag <?

How many ways you can embed PHP code in an HTML page?

PHP provides four different ways to do this. As you'll see, the first, and preferred, method looks like XML. The second method looks like SGML. The third method is based on ASP tags.

Where to write PHP in HTML?

A PHP script can be placed anywhere in the document. The default file extension for PHP files is " .php ". A PHP file normally contains HTML tags, and some PHP scripting code.