Which of the following is not valid PHP code?

  1. $_10

  2. ${"MyVar"}

  3. &$something

  4. $10_somethings


Correct Option: D

AI Explanation

To answer this question, let's go through each option and determine if it is valid PHP code:

Option A) $_10 - This option is valid PHP code. Variable names in PHP can start with a letter or an underscore, followed by any combination of letters, numbers, or underscores.

Option B) ${"MyVar"} - This option is valid PHP code. It demonstrates the use of variable variables in PHP, where the variable name is constructed by using the value of another variable.

Option C) &$something - This option is valid PHP code. It demonstrates the use of a reference variable in PHP, denoted by the ampersand symbol (&).

Option D) $10_somethings - This option is not valid PHP code. Variable names in PHP cannot start with a number. They must start with a letter or an underscore.

Therefore, the correct answer is D) $10_somethings. This option is not valid PHP code because it violates the naming conventions for variables in PHP.

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