Skip to main content

starts_with

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 whether the string starts with the given prefix

namespace HH\Lib\Str;

function starts_with(
  string $string,
  string $prefix,
): bool;

For a case-insensitive check, see Str\starts_with_ci().

Guide​

Parameters​

  • string $string
  • string $prefix

Returns​

  • bool

Examples​

$result = Str\starts_with("example_string", "example");
echo($result);
//result: true

$result = Str\starts_with("example_string", "EXAMPLE");
echo($result);
//result: false

$result = Str\starts_with("example_string", "string");
echo($result);
//result: false