Definition: Spellchecker.php is a PHP script used for spell checking online tools. It's crucial for identifying grammatical errors in text inputs. Definition: Spellchecker.php, also known as spell_checker.php, is an extension or module that adds functionality to online spell checkers by converting user input into a string of letters and numbers. This process aims to help users find spelling errors and improve their grammar skills through a more comprehensive review of the sentence's meaning, context, and usage. In simpler terms: Spellchecker.php allows you to enter text into an online spell checker, which then checks for grammatical mistakes in your input.