Replace Every Ci

:::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 the "haystack" string with all occurrences of the keys of $replacements replaced by the corresponding values (case-insensitive)

namespace HH\Lib\Str;

function replace_every_ci(
  string $haystack,
  KeyedContainer<string, string> $replacements,
): string;

Replacements are applied in the order they are specified in $replacements, and the new values are searched again for subsequent matches. For example, dict['a' => 'b', 'b' => 'c'] is equivalent to dict['a' => 'c'], but dict['b' => 'c', 'a' => 'b'] is not, despite having the same elements.

If there are multiple overlapping matches, the match occuring earlier in $replacements (not in $haystack) takes precedence.

• For a single case-sensitive search/replace, see Str\replace().
• For a single case-insensitive search/replace, see Str\replace_ci().
• For multiple case-sensitive searches/replacements, see Str\replace_every().
• For not having new values searched again, see Str\replace_every_nonrecursive_ci().

Guide

• String

Parameters

• string $haystack
• KeyedContainer<string,string> $replacements

Returns

• string

Examples

$result = Str\replace_every_ci("example_string", dict["example"=>"test", "string"=>"value"]);
echo($result);
//result: test_value

$result = Str\replace_every_ci("example_string", dict["EXAMPLE"=>"test", "STRING"=>"value"]);
echo($result);
//result: test_value

$result = Str\replace_every_ci("example_string", dict["uncontained"=>"test", "uncontained_2"=>"value"]);
echo($result);
//result: example_string