PHP - Superglobals and Web Context
Which PHP function is used to validate if a string is a valid URL?
Which PHP function is used to validate if a string is a valid URL?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify URL validation function
PHP's filter_var() with FILTER_VALIDATE_URL checks if a string is a valid URL format.Step 2: Review other functions
htmlspecialchars() escapes HTML, trim() removes spaces, str_replace() replaces strings; none validate URLs.Final Answer:
filter_var() with FILTER_VALIDATE_URL -> Option AQuick Check:
URL validation = filter_var + FILTER_VALIDATE_URL [OK]
Quick Trick: Use filter_var() with FILTER_VALIDATE_URL for URLs [OK]
Common Mistakes:
- Using htmlspecialchars() for validation
- Confusing trim() with validation
- Trying to validate URLs with str_replace()
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