PHP Fundamentals Quiz
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Questions and Answers

What will happen if the header() function is called after any output has been sent to the browser?

  • PHP will ignore the header() function.
  • The output will be sent but without any headers.
  • An error will occur indicating that headers cannot be modified. (correct)
  • The headers will be sent successfully.

What is the correct content type header for returning JSON data?

  • Content-Type: application/xml
  • Content-Type: text/plain
  • Content-Type: application/json (correct)
  • Content-Type: text/html

Where should empty lines or spaces not be placed when working with the header() function?

  • At the end of the PHP file only.
  • Within the blocks of PHP code.
  • After the header() call.
  • At the beginning of the PHP file before the opening tag. (correct)

What is the primary purpose of the PHP built-in server introduced in PHP 5.4?

<p>To run applications for development and testing. (D)</p> Signup and view all the answers

What is the intended output of the echo statement 'echo STDERR;'?

<p>Outputs the error messages to the standard error output. (B)</p> Signup and view all the answers

What is the main function of PHP when used in web development?

<p>PHP adds dynamic content by being executed on the web server. (A)</p> Signup and view all the answers

Which version of PHP is supported until December 3, 2018?

<p>PHP 7.1 (B)</p> Signup and view all the answers

What is the significance of the echo statement in PHP?

<p>It outputs data to the web browser directly. (A)</p> Signup and view all the answers

Which of the following PHP versions is considered a legacy version?

<p>PHP 3.0 (D)</p> Signup and view all the answers

When a PHP script is executed, what does it ultimately send to the user's browser?

<p>Processed HTML (D)</p> Signup and view all the answers

Which PHP versions were supported until 2018?

<p>5.5 and 5.6 (D)</p> Signup and view all the answers

Which statement about the PHP versioning system is true?

<p>Each version has a distinct end-of-life date. (C)</p> Signup and view all the answers

What is the earliest version listed in PHP 4.x?

<p>4.0 (C)</p> Signup and view all the answers

What is a notable difference between echo and print in PHP?

<p>echo is faster than print. (A)</p> Signup and view all the answers

Which function is used to send a raw HTTP header in PHP?

<p>header() (B)</p> Signup and view all the answers

Why is proper data escaping essential when outputting data in PHP?

<p>To prevent XSS attacks. (A)</p> Signup and view all the answers

What does the header function with 'Content-Type: application/json' indicate?

<p>The output is a valid JSON string. (D)</p> Signup and view all the answers

When using echo in PHP, which statement is true?

<p>It can accept multiple arguments without parentheses. (C)</p> Signup and view all the answers

What output will the following PHP code generate: header('Content-Type: text/plain'); echo 'Hello World';?

<p>A plain text document displaying 'Hello World'. (D)</p> Signup and view all the answers

Which statement correctly describes the short syntax for outputting data prior to PHP 5.4.0?

<p>It requires short_open_tag configuration to be enabled. (C)</p> Signup and view all the answers

What would be the correct PHP code to output a variable as JSON?

<p>$jsonData = json_encode(array('key' =&gt; 'value')); (A)</p> Signup and view all the answers

Flashcards

PHP 7.0

A version of the PHP programming language, released in 2015.

PHP 5.6

A version of the PHP programming language released in 2014.

How does PHP work with web servers?

PHP is executed on a web server and the resulting HTML is sent to the browser. This means the server processes the PHP code first, and then sends the output HTML to the user's browser.

What is the role of 'echo' in PHP?

The "echo" statement in PHP allows you to write text directly into a webpage. When the page is loaded, this text will appear as part of the content.

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What is the shortcut syntax for 'echo'?

The shortcut syntax allows you to write a value directly after the 'echo' command, making your code shorter and more compact.

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How do HTML and PHP interact on a webpage?

PHP scripts are executed by a web server, and the resulting HTML is then sent to the browser. The browser then interprets the HTML and displays the webpage to the user.

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What is the difference between PHP and HTML?

PHP scripts are processed on the server before any HTML is sent to the user's browser. This allows PHP to dynamically generate content, making the website more interactive.

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Why is it crucial to understand PHP versions?

It's important to note that PHP versions have their own support periods. Make sure to use versions that are actively supported for optimal security and compatibility.

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echo

A language construct in PHP used to print output to the screen. It has a void return and can take multiple arguments without parentheses.

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print

Another language construct in PHP for printing output. It returns an integer value of 1 and takes only one argument.

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printf

A function in PHP used for formatted output. It takes a format string and arguments to control the output.

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XSS

Cross-Site Scripting, a security vulnerability where malicious scripts are injected into websites. It can be used for data theft or manipulation.

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header()

A function in PHP used to send raw HTTP headers to the client.

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PSR-1

A standard for PHP code style, promoting readability and maintainability.

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Text

A type of data that represents text. It can be used for storage, display, and manipulation in programs.

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JSON

Data format designed for exchanging information between systems. It is human-readable and machine-parsable.

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What is the header() function in PHP?

The function header() in PHP is used to send raw HTTP headers to the client (usually a web browser). It allows you to set various header information like content type, cookies, redirects, and more.

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Why is it crucial to call header() before sending any output in PHP?

PHP requires all headers to be sent before any output is generated. If you attempt to use header() after any output, the browser won't receive the headers and an error will occur.

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What is PHP's built-in server?

PHP's built-in server is a handy tool for development and testing purposes. You can use it to run PHP applications without needing a traditional web server like Apache or Nginx.

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How can you use PHP's output buffering to send headers after output?

If you need to send headers after output, you can use PHP's output buffering. Output buffering intercepts the output and stores it in memory, allowing you to send headers afterwards.

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How do you start PHP's built-in server?

PHP uses a -S flag to activate the built-in server. You provide a port number after the -S flag, for example, php -S localhost:8000. This will start the server on port 8000 on your localhost.

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Study Notes

PHP Notes for Professionals

  • This book provides 400+ pages of professional hints and tricks for PHP.
  • The book covers various topics including working with dates, string formatting, sending email, and more.
  • Chapter 18 discusses working with dates, including calculating differences between dates and converting date formats.
  • Chapter 24 details string formatting using interpolation (inserting variables into strings), providing examples with curly braces.
  • Chapter 64 describes sending emails in PHP, including how to add headers and use variables for recipients, subjects, and message bodies.
  • The book also includes a comprehensive table of contents covering various PHP topics, such as getting started, variables, variable scope, superglobal variables, and more.

Table of Contents (Partial)

  • Chapter 1: Getting started with PHP (HTML output, Hello World!, PHP built-in server, PHP CLI)
  • Chapter 2: Variables (Accessing variables dynamically, data types, global variables, variable truthiness)
  • Chapter 3: Variable Scope (Superglobal variables, static properties and variables)
  • Chapter 4: Superglobal variables (Explanation of each superglobal)
  • Chapter 5: Outputting the Value of a Variable (echo, print, string concatenation)
  • Chapter 6: Constants (Defining constants, using constants, constant arrays)
  • Chapter 7: Magic Constants (Difference between __FUNCTION__ and __METHOD__, __CLASS__)
  • Chapter 8: Comments (Single-line and multi-line comments)
  • Chapter 9: Types (Type comparison, booleans, integers, floats, strings)
  • Chapter 10: Operators (Null coalescing operator, spaceship operator, execution operator)
  • Chapter 11: References (Assignment by reference, return by reference, pass by reference)
  • Chapter 12: Arrays (Initialization, checking key existence, creating arrays of variables)
  • Chapter 13: Array iteration (Using an incremental index, using internal array pointers)
  • Chapter 14: Executing upon an array (Applying a function to each element, Splitting an array into chunks)
  • ---and many more chapters like dates, control structures, functions, classes, objects, sessions, cookies, JSON, SOAP, cURL, Reflection, and others.

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PHP Notes For Professionals PDF

Description

Test your knowledge of PHP fundamentals with this quiz. From understanding the header() function to the significance of the echo statement, this quiz covers key concepts essential for any PHP developer. Perfect for beginners and those looking to refresh their skills.

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