Questions
PHP questions
Choose a question page, learn the concept, then test your understanding with a quiz.
Choosing the Right MySQL Collation for PHP and UTF-8
Learn how MySQL character sets and collations work with PHP, and how to choose a practical UTF-8 setup for web applications.
Convert a PHP Object to an Associative Array
Learn how to convert a PHP object to an associative array, including quick methods, recursion, pitfalls, and practical examples.
Convert a Postman Request to cURL and PHP cURL
Learn how to convert a Postman POST request into a cURL command and use the same request in PHP cURL with headers and body.
Converting HTML and CSS to PDF in PHP: Core Concepts, Limits, and Practical Approaches
Learn how HTML-to-PDF conversion works in PHP, why CSS support varies, and how to choose practical approaches for reliable PDF output.
Format Numbers to Two Decimal Places in PHP
Learn how to format a PHP string number to two decimal places using number_format, rounding, and safe numeric conversion.
How PHP foreach Actually Works with Arrays
Learn how PHP foreach works internally, including array copies, internal pointers, by-value vs by-reference behavior, and common pitfalls.
How to Calculate the Difference Between Two Dates in PHP
Learn how to calculate the difference between two dates in PHP using DateTime and DateInterval, with examples and common mistakes.
How to Check String Prefixes and Suffixes in PHP
Learn how to check whether a string starts or ends with specific text in PHP using simple functions and practical examples.
How to Check if a PHP Array Is Associative or Sequential
Learn how to detect associative vs sequential arrays in PHP, with clear examples, edge cases, and practical patterns for real code.
How to Check if a String Contains a Word in PHP
Learn how to check whether a PHP string contains a specific word using strpos and str_contains with clear examples and common mistakes.
How to Convert a String to a Number in PHP
Learn how to convert strings like '2' or '2.34' to numbers in PHP using casting, numeric checks, and safe conversion patterns.
How to Delete an Array Element by Value in PHP
Learn how to remove an array element by value in PHP using array_search and unset, with examples, pitfalls, and practical patterns.
How to Delete an Element from an Array in PHP
Learn how to remove array elements in PHP using unset, array_filter, and reindexing, with examples and common mistakes explained clearly.
How to Detect HTTP Request Methods in PHP (GET, POST, PUT, DELETE)
Learn how to detect GET, POST, PUT, and DELETE requests in PHP using REQUEST_METHOD, with examples, pitfalls, and real-world usage.
How to Display PHP Errors in the Browser
Learn how PHP error display works, why blank pages happen, and how to enable useful errors during development safely.
How to Expire a PHP Session After 30 Minutes
Learn how to expire a PHP session after 30 minutes using inactivity timeouts, session checks, and safe logout logic in PHP.
How to Find and Configure php.ini in PHP
Learn where php.ini is located, how PHP loads configuration files, and how to enable extensions like ibm_db2 safely and correctly.
How to Find the Number of Days Between Two Dates in PHP
Learn how to calculate the number of days between two dates in PHP using DateTime, diff(), timestamps, and common best practices.
How to Fix PHP Allowed Memory Size Exhausted Errors When Sending Large XML-RPC Payloads
Learn why PHP memory exhausted errors happen with large XML-RPC requests and how to reduce memory use in PHP and CodeIgniter apps.
How to Fix PHP Parse and Syntax Errors
Learn how to read PHP parse errors, find the real cause, and fix common syntax mistakes with practical examples and debugging steps.
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