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@ 2016-08-08T18:57:39Z

<?php
    function parseSearchTerms($queryStr) {
        $searchTerms = [
            'canHave' => [],
            'mustHave' => [],
            'cannotHave' => []
        ];

        $keyword = '';
        $quoted  = false;
        $mod     = null;
        $escaped = false;
        $spaced  = true;

        for($i=0,$l=strlen($queryStr);$i<$l;$i++) {
            $char = $queryStr[$i];

            if(ctype_space($char)) {
                $char = ' ';
            }

            switch($char) {
                case ' ':
                    if($quoted || !$spaced) {
                        $keyword .= $char;
                        $spaced = true;
                    }
                    else if(!$quoted && !empty($keyword)) {
                        if(is_null($mod)) {
                            $searchTerms['canHave'][] = $keyword;
                        }
                        else {
                            if($mod == '+') {
                                $searchTerms['mustHave'][] = $keyword;
                            }
                            else if($mod == '-') {
                                $searchTerms['cannotHave'][] = $keyword;
                            }
                        }
                        $keyword = '';
                    }
                    break;
                case '"':
                    if(!$escaped) {
                        if($quoted) {
                            if(is_null($mod)) {
                                $searchTerms['canHave'][] = $keyword;
                            }
                            else {
                                if($mod == '+') {
                                    $searchTerms['mustHave'][] = $keyword;
                                }
                                else if($mod == '-') {
                                    $searchTerms['cannotHave'][] = $keyword;
                                }
                            }
                            $keyword = '';
                            $quoted = false;
                        }
                    }
                    break;
                case '+':
                case '-':
                    if($spaced) {
                        $mod = $char;
                        $spaced = false;
                    }
                    else {
                        $mod = null;
                        $keyword .= $char;
                        $spaced = false;
                    }
                    break;
                default:
                    $keyword .= $char;
                    $spaced = false;
                    break;
            }
        }
        if(!is_null($mod)) {
            if($mod == '+') {
                $searchTerms['mustHave'][] = $keyword;
            }
            else if($mod == '-') {
                $searchTerms['cannotHave'][] = $keyword;
            }
        }
        return $searchTerms;
    }

    var_dump(parseSearchTerms('+here are -no some "search terms"'));

Output for 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: array(3) { ["canHave"]=> array(0) { } ["mustHave"]=> array(0) { } ["cannotHave"]=> array(1) { [0]=> string(29) "here are no some search terms" } }
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array(3) { ["canHave"]=> array(0) { } ["mustHave"]=> array(0) { } ["cannotHave"]=> array(1) { [0]=> string(29) "here are no some search terms" } }

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