What is the difference between isset() and other is_*() functions (is_alpha(), is_number(), etc.)?

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Options

• Aisset() is a function call and is_*() are not function calls
• Bis_*() are language constructs and isset() is not a language construct
• Cc) isset() is a language construct and is_*() are not language constructs
• Dd) is_*() return a value whereas isset() does not

• A
  3% (1)
• B
  9% (3)
• C
  71% (24)
• D
  18% (6)

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