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nocache_headers() WP 1.0

Set the headers to prevent caching for the different browsers.

Different browsers support different nocache headers, so several headers must be sent so that all of them get the point that no caching should occur.

Notes:

  • See: wp_get_nocache_headers()
Works based on: wp_get_nocache_headers()

No Hooks.

Return

Nothing (null).

Usage

nocache_headers();

Code of nocache_headers: wp-includes/functions.php VER 4.9.8

<?php
function nocache_headers() {
	$headers = wp_get_nocache_headers();

	unset( $headers['Last-Modified'] );

	// In PHP 5.3+, make sure we are not sending a Last-Modified header.
	if ( function_exists( 'header_remove' ) ) {
		@header_remove( 'Last-Modified' );
	} else {
		// In PHP 5.2, send an empty Last-Modified header, but only as a
		// last resort to override a header already sent. #WP23021
		foreach ( headers_list() as $header ) {
			if ( 0 === stripos( $header, 'Last-Modified' ) ) {
				$headers['Last-Modified'] = '';
				break;
			}
		}
	}

	foreach ( $headers as $name => $field_value )
		@header("{$name}: {$field_value}");
}

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From tag: PHP headers (cookies)

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