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capitalize_words

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.

Returns the string with all words capitalized

namespace HH\Lib\Str;

function capitalize_words(
  string $string,
  ?string $delimiters = NULL,
): string;

Words are delimited by space, tab, newline, carriage return, form-feed, and vertical tab by default, but you can specify custom delimiters.

  • To capitalize all characters, see Str\uppercase().
  • To capitalize only the first character, see Str\capitalize().

Guide​

Parameters​

  • string $string
  • ?string $delimiters = NULL

Returns​

  • string