PHP - Superglobals and Web Context
Identify the error in this PHP code snippet that tries to print the visitor's browser info:
echo $_SERVER[HTTP_USER_AGENT];
Identify the error in this PHP code snippet that tries to print the visitor's browser info:
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Check array key syntax
Array keys must be strings in quotes. Here, HTTP_USER_AGENT is missing quotes.Step 2: Confirm key existence
HTTP_USER_AGENTis a valid key in$_SERVER, so the key name is correct.Final Answer:
Missing quotes around the array key -> Option CQuick Check:
Array keys need quotes [OK]
Quick Trick: Always quote $_SERVER keys like 'HTTP_USER_AGENT' [OK]
Common Mistakes:
- Forgetting quotes around keys
- Assuming key name is wrong
- Trying to echo whole $_SERVER array directly
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