📊 PHP
Q. Which PHP functions are used to convert string to lowercase and uppercase?
  • (A) strupper() and strlower()
  • (B) str_toupper() and str_tolower()
  • (C) toupper() and tolower()
  • (D) strtoupper() and strtolower()
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✅ Correct Answer: (D) strtoupper() and strtolower()

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