Starts With

:::info[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

• String

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