Search for a Word in a Text File Using PHP | Find All Occurrences with Line Numbers

✅ Read the entire file line by line
✅ Search for all instances of the word, regardless of how many times it appears
✅ Display the line number(s) where the word is found

📚 This is a great exercise in:
- File handling (fopen, fgets)
- String search (strpos)
- Looping through files
- Displaying search results dynamically

💡 Perfect for beginner to intermediate PHP learners looking to work with real file data and search logic!