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php functions

  • The NULL type
  • isset() - Determine if a variable is set and is not NULL
  • is_bool() - Finds out whether a variable is a boolean
  • is_numeric() - Finds whether a variable is a number or a numeric string
  • is_float() - Finds whether the type of a variable is float
  • is_int() - Find whether the type of a variable is integer
  • is_string() - Find whether the type of a variable is string
  • is_object() - Finds whether a variable is an object
  • is_array() - Finds whether a variable is an array