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Error Identifiers: function.*

There are 17 error identifiers in the function.* group:

• function.alreadyNarrowedType
  Type-checking function call is redundant because the type is already narrowed.
• function.deprecated phpstan-deprecation-rules
  Called function is marked as deprecated.
• function.duplicate
  Function is declared multiple times.
• function.impossibleHaystackValue
  A value in a constant array haystack passed to in_array(), array_search() or array_keys() can never match the needle type.
• function.impossibleType
  Type-checking function call will always evaluate to false.
• function.inner
  Named function is declared inside another function.
• function.internal
  Called function is marked as internal and not part of the public API.
• function.inVoidCast
  Unnecessary (void) cast on a function that does not require its return value to be used.
• function.nameCase
  Function is called with incorrect letter casing.
• function.notFound
  Called function does not exist or cannot be found.
• function.resultDiscarded non-ignorable
  Return value of a #[NoDiscard] function is not used.
• function.resultUnused
  Return value of a pure function call is not used.
• function.strict phpstan-strict-rules
  Function call is missing the strict comparison parameter.
• function.unresolvableReturnType
  Return type of a function call contains an unresolvable type after template substitution.
• function.uselessReturnValue
  Return value of a function like print_r() is useless without the return parameter.
• function.variance
  Variance annotation on a function template type is not meaningful.
• function.void
  Return value of a void function is being used.