Remove previously set headers

# header_remove

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

header_remove — Remove previously set headers

### Description

header_remove(?string `$name` = `null`): void

Removes an HTTP header previously set using header().

### Parameters

`name`

  The header name to be removed. When `null`, all previously set headers are removed.

  > Note: This parameter is case-insensitive.

### Return Values

No value is returned.

### Changelog

Version | Description
--- | ---
8.0.0 | `name` is nullable now.

### Examples

Example #1 Unsetting specific header.

`<?php
header("X-Foo: Bar");
header("X-Bar: Baz");
header_remove("X-Foo");
?>`

The above example will output something similar to:

    X-Bar: Baz

Example #2 Unsetting all previously set headers.

`<?php
header("X-Foo: Bar");
header("X-Bar: Baz");
header_remove();
?>`

The above example will output something similar to:

### Notes

Caution

This function will remove all headers set by PHP, including cookies, session and the `X-Powered-By` headers.

> Note:

> Headers will only be accessible and output when a SAPI that supports them is in use.

### See Also

- header() - Send a raw HTTP header
- headers_sent() - Checks if or where headers have been sent

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