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trim_left

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 given string with whitespace stripped from the left

namespace HH\Lib\Str;

function trim_left(
  string $string,
  ?string $char_mask = NULL,
): string;

See Str\trim() for more details.

  • To strip from both ends, see Str\trim().
  • To only strip from the right, see Str\trim_right().
  • To strip a specific prefix (instead of all characters matching a mask), see Str\strip_prefix().

Guide​

Parameters​

  • string $string
  • ?string $char_mask = NULL

Returns​

  • string