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setAppendItemFormat

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

An append item format is a pattern used to append a field if there is no good match

public function setAppendItemFormat(
  int $field,
  string $value,
): void;

For example, suppose that the input skeleton is "GyyyyMMMd", and there is no matching pattern internally, but there is a pattern matching "yyyyMMMd", say "d-MM-yyyy". Then that pattern is used, plus the G. The way these two are conjoined is by using the AppendItemFormat for G (era). So if that value is, say "0, 1" then the final resulting pattern is "d-MM-yyyy, G".

There are actually three available variables: 0 is the pattern so far, 1 is the element we are adding, and 2 is the name of the element.

Parameters​

  • int $field - Pattern field (see constants)
  • string $value - Pattern, such as "0, 1"

Returns​

  • void