PHP - Variables and Data Types
Which of the following is a valid PHP variable name?
Which of the following is a valid PHP variable name?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Check variable naming rules in PHP
PHP variable names must start with a dollar sign ($) followed by letters, numbers, or underscores, but cannot start with a number or special character.Step 2: Evaluate each option
Only "$userName" starts with $ and uses valid characters. Others either miss $ or use invalid characters.Final Answer:
$userName -> Option AQuick Check:
Valid PHP variable name = $userName [OK]
Quick Trick: Variable names must start with $ and letters or underscore [OK]
Common Mistakes:
- Missing $ at start
- Using special characters like # or -
- Starting variable name with a number
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