PHP setcookie function polyfill with support for SameSite attribute (compatible with PHP 5.0+)

setcookie_samesite_polyfill.php

<?php

/**
 * Setcookie function with support for SameSite
 * @param  string|null  $samesite 'Lax' or 'Strict'
 */
function setcookie_samesite( $name, $value = '', $expire = 0, $path = null, $domain = null, $secure = false, $httponly = false, $samesite = null) 
{
	$header = 'Set-Cookie: '.rawurlencode($name) . '=' . rawurlencode($value).';';
	$header .= $expire   ? sprintf('expires=%s', gmdate('D, d M Y H:i:s \G\M\T', $expire)).'; ' : '';
	$header .= $path     ? sprintf('path=%s', join('/', array_map('rawurlencode', explode('/', $path)))).'; ' : '';
	$header .= $domain   ? sprintf('domain=%s', rawurlencode($domain)).'; ' : '';
	$header .= $secure   ? 'secure; ' : '';
	$header .= $httponly ? 'httponly; ' : '';
	$header .= $samesite ? sprintf('samesite=%s', rawurlencode($samesite)).'; ' : '';
	return header($header, false);
}