PHP - Superglobals and Web Context
You want to accept only alphabetic characters from user input in PHP. Which code snippet correctly sanitizes and validates this input?
You want to accept only alphabetic characters from user input in PHP. Which code snippet correctly sanitizes and validates this input?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Check sanitization for alphabets only
preg_replace removes all non-alphabetic characters, leaving only letters.Step 2: Validate with ctype_alpha
ctype_alpha checks if string contains only letters, confirming valid input.Final Answer:
Use preg_replace to remove non-letters and ctype_alpha to validate -> Option DQuick Check:
Regex sanitize + ctype_alpha validate alphabets [OK]
Quick Trick: Use preg_replace and ctype_alpha for letters only [OK]
Common Mistakes:
- Using non-existent FILTER_VALIDATE_ALPHA
- Assuming is_string validates content
- Using preg_match to check digits for validation
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