Questions
PHP questions
Choose a question page, learn the concept, then test your understanding with a quiz.
How to Fix the "Headers Already Sent" Error in PHP
Learn why PHP shows "Headers already sent" and how to fix it when using header() or setcookie() with clear examples.
How to Get Raw SQL from Laravel Query Builder
Learn how to view the raw SQL generated by Laravel's query builder, including toSql(), bindings, and common debugging patterns.
How to Get a File Extension in PHP
Learn the best way to get a file extension in PHP, including pathinfo(), edge cases, examples, and common mistakes beginners make.
How to Get a YouTube Video Thumbnail in PHP Using the YouTube API
Learn how to get a YouTube video thumbnail from a YouTube URL in PHP using the YouTube Data API and simple thumbnail URLs.
How to Get the Client IP Address in PHP
Learn how to get a client IP address in PHP, when to use REMOTE_ADDR, and how to safely handle proxies and logging.
How to Get the Current Date and Time in PHP
Learn how to get the current date and time in PHP using date(), time(), and DateTime with clear examples and common mistakes.
How to Get the Current Year in PHP for Dynamic Copyright Footers
Learn how to get the current year in PHP and use it in a dynamic copyright footer that updates automatically every year.
How to Get the First Element of an Array in PHP
Learn how to get the first element of a PHP array without using array_shift or passing by reference, with examples and common pitfalls.
How to Get the First Key of an Array in PHP
Learn how to get the first key of an array in PHP, including associative arrays, older approaches, and common mistakes to avoid.
How to Get the Full Current URL in PHP
Learn how to get the full current URL in PHP, including rewritten paths, query strings, and HTTPS, with practical examples and common pitfalls.
How to Hash Passwords with bcrypt in PHP
Learn what bcrypt is in PHP, how password_hash and password_verify work, and the correct way to store passwords securely.
How to Parse and Process HTML/XML in PHP
Learn how to parse HTML and XML in PHP using DOMDocument, XPath, and SimpleXML to extract data safely and clearly.
How to Pass Variables from PHP to JavaScript Safely
Learn how to pass PHP variables to JavaScript safely using json_encode, data attributes, and script blocks with practical examples.
How to Prevent SQL Injection in PHP
Learn how to prevent SQL injection in PHP using prepared statements, parameter binding, input validation, and safe database APIs.
How to Redirect in PHP with the header() Function
Learn how to redirect users in PHP using header(), including syntax, login protection, common mistakes, and real examples.
How to Remove Empty Array Elements in PHP
Learn how to remove empty strings from PHP arrays, why unset() inside foreach fails, and the best ways to clean user input safely.
How to Remove Spaces from a String in PHP
Learn how to remove spaces from a string in PHP using str_replace, regex, and trim, with examples, mistakes, and practical use cases.
How to Remove the Last Character from a String in JavaScript
Learn how to remove a trailing character from a delimited string in JavaScript using slice, regex, and safe checks.
How to Return JSON from a PHP Script
Learn how to return JSON from PHP correctly using json_encode, proper headers, and practical examples for APIs and AJAX responses.
How to Sanitize User Input in PHP for SQL Injection and XSS
Learn how to sanitize and validate user input in PHP to prevent SQL injection and XSS while safely allowing selected HTML tags.