Current File : //var/www/arphotolab.eco-n-tech.co.uk/wp-content/plugins/polylang/frontend/accept-language.php
<?php
/**
* @package Polylang
*/
/**
* Class Accept_Language.
*
* Represents an Accept-Language HTTP Header, as defined in RFC 2616 Section 14.4 {@see https://tools.ietf.org/html/rfc2616.html#section-14.4}.
*
* @since 3.0
*/
class PLL_Accept_Language {
const SUBTAG_PATTERNS = array(
'language' => '(\b[a-z]{2,3}|[a-z]{4}|[a-z]{5-8}\b)',
'language-extension' => '(?:-(\b[a-z]{3}){1,3}\b)?',
'script' => '(?:-(\b[a-z]{4})\b)?',
'region' => '(?:-(\b[a-z]{2}|[0-9]{3})\b)?',
'variant' => '(?:-(\b[0-9][a-z]{1,3}|[a-z][a-z0-9]{4,7})\b)?',
'extension' => '(?:-(\b[a-wy-z]-[a-z0-9]{2,8})\b)?',
'private-use' => '(?:-(\bx-[a-z0-9]{1,8})\b)?',
);
/**
* @var string[] {
* @type string $language Usually 2 or three letters (ISO 639).
* @type string $language-extension Up to three groups of 3 letters.
* @type string $script Four letters.
* @type string $region Either two letters of three digits.
* @type string $variant Either one digit followed by 1 to 3 letters, or a letter followed by 2 to 7 alphanumerical characters.
* @type string $extension One letter that cannot be an 'x', followed by 2 to 8 alphanumerical characters.
* @type string $private-use Starts by 'x-', followed by 1 to 8 alphanumerical characters.
* }
*/
protected $subtags;
/**
* @var float
*/
protected $quality;
/**
* PLL_Accept_Language constructor.
*
* @since 3.0
*
* @param string[] $subtags With subtag name as keys and subtag values as names.
* @param mixed $quality Floating point value from 0.0 to 1.0. Higher values indicates a user's preference.
*/
public function __construct( $subtags, $quality = 1.0 ) {
$this->subtags = $subtags;
$this->quality = is_numeric( $quality ) ? floatval( $quality ) : 1.0;
}
/**
* Creates a new instance from an array resulting of a PHP {@see preg_match()} or {@see preg_match_all()} call.
*
* @since 3.0
*
* @param string[] $matches Expects first entry to be full match, following entries to be subtags and last entry to be quality factor.
* @return PLL_Accept_Language
*/
public static function from_array( $matches ) {
$subtags = array_combine(
array_keys( array_slice( self::SUBTAG_PATTERNS, 0, count( $matches ) - 1 ) ),
array_slice( $matches, 1, count( self::SUBTAG_PATTERNS ) )
);
$quality = count( $matches ) === 9 ? $matches[8] : 1.0;
return new PLL_Accept_Language( $subtags, $quality );
}
/**
* Returns the full language tag.
*
* @since 3.0
*
* @return string
*/
public function __toString() {
$subtags = array_filter(
$this->subtags,
function ( $subtag ) {
return ! empty( trim( $subtag ) );
}
);
return implode( '-', $subtags );
}
/**
* Returns the quality factor as negotiated by the browser agent.
*
* @since 3.0
*
* @return float
*/
public function get_quality() {
return $this->quality;
}
/**
* Returns a subtag from the language tag.
*
* @since 3.0
*
* @param string $name A valid subtag name, {@see PLL_Accept_Language::SUBTAG_PATTERNS} for available subtag names.
* @return string
*/
public function get_subtag( $name ) {
return isset( $this->subtags[ $name ] ) ? $this->subtags[ $name ] : '';
}
}
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