HttpAcceptParser.php

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<?php
 
namespace Wikimedia\Http;
 
class HttpAcceptParser {
 
    public function parseWeights( $rawHeader ) {
        //FIXME: The code below was copied and adapted from WebRequest::getAcceptLang.
        //       Move this utility class into core for reuse!
 
        // first, strip header name
        $rawHeader = preg_replace( '/^[-\w]+:\s*/', '', $rawHeader );
 
        // Return values in lower case
        $rawHeader = strtolower( $rawHeader );
 
        // Break up string into pieces (values and q factors)
        $value_parse = null;
        preg_match_all( '@([a-z\d*]+([-+/.][a-z\d*]+)*)\s*(;\s*q\s*=\s*(1(\.0{0,3})?|0(\.\d{0,3})?)?)?@',
            $rawHeader, $value_parse );
 
        if ( !count( $value_parse[1] ) ) {
            return [];
        }
 
        $values = $value_parse[1];
        $qvalues = $value_parse[4];
        $indices = range( 0, count( $value_parse[1] ) - 1 );
 
        // Set default q factor to 1
        foreach ( $indices as $index ) {
            if ( $qvalues[$index] === '' ) {
                $qvalues[$index] = 1;
            } elseif ( $qvalues[$index] == 0 ) {
                unset( $values[$index], $qvalues[$index], $indices[$index] );
            } else {
                $qvalues[$index] = (float)$qvalues[$index];
            }
        }
 
        // Sort list. First by $qvalues, then by order. Reorder $values the same way
        array_multisort( $qvalues, SORT_DESC, SORT_NUMERIC, $indices, $values );
 
        // Create a list like "en" => 0.8
        $weights = array_combine( $values, $qvalues );
 
        return $weights;
    }
 
}