This API is part of the Hack Standard Library, not HHVM itself.
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This function is available as Str\capitalize() in Facebook's www repository.

Returns the string with the first character capitalized


namespace HH\Lib\Str;

function capitalize(
  string $string,
): string;

If the first character is already capitalized or isn't alphabetic, the string will be unchanged.

To capitalize all characters, see Str\uppercase(). To capitalize all words, see Str\capitalize_words().


  • string $string