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xhprof_frame_begin

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.

Starts an artificial frame

function xhprof_frame_begin(
  string $name,
): void;

Together with xhprof_frame_end(), this times one block of code execution as if it were a function call, allowing people to define arbitrary function boundaries.

Parameters​

  • string $name - The "virtual" function's name.

Returns​

  • void