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@ 2013-09-10T08:37:49Z

<?php


if (!function_exists('json_encode')) {
    
    function json_encode($it) {
        if (!($assoc = is_object($it)) && !is_array($it)) {
            return _js_enc_value($it);
        }
        $i = 0;
        $it = (array)$it;
        if (!$assoc) {
            foreach ($it as $k => $v) {
                if ($k !== $i) {
                    $assoc = true;
                    break;
                }
                $i++;
            }
        }
        $data = array();
        foreach ($it as $k => $v) {
            $v = _js_enc_value($v);
            if ($assoc) {
                $k = (string)$k;
                if (preg_match('//u', $k)) {
                    $k = _js_enc_value($k);
                    $data[] = $k . ':' . $v;
                }
            } else {
                $data[] = $v;
            }
        }
        if ($assoc) {
            $bl = '{';
            $br = '}';
        } else {
            $bl = '[';
            $br = ']';
        }
        return $bl . implode(',', $data) . $br;
    }

    function _js_enc_value($value) {
        switch (true) {
            case is_array($value):
            case is_object($value):
                return json_encode($value);
            case $value === null:
            case is_resource($value):
                return 'null';
            case is_bool($value): 
                return $value ? 'true' : 'false';
            case is_string($value) && preg_match('//u', $value):
                return '"' . _js_uc_esc($value) . '"';
            default:
                return $value;   
        }
    }

    function _js_uc_esc($value) {
        $pattern = "@[\x08-\x0a\x0c\x0d\\\\\"/]|([^\x08-\x0a\x0c\x0d\x20-\x7f\\\\\"/])++@u";
        return preg_replace_callback($pattern, '_js_uc_esc_cb', $value);
    }
 
    function _js_uc_esc_cb($matches) {
        switch (true) {
            case isset($matches[1]):
                $char = mb_convert_encoding($matches[0], 'UTF-16', 'UTF-8');
                $str = '';
                $len = strlen($char);
                for ($i = 0; $i < $len; $i += 2) {
                    $str .= sprintf('\\u%02x%02x',
                        ord($char[$i]),
                        ord($char[$i + 1])
                    );
                }
                return $str;
            default:
                return addcslashes($matches[0], "\x08\x09\x0a\x0c\x0d\\\"/");
        }
    }
 
}

$var = array(
    array(
        'text',
        1,
        1.1,
        true,
        false,
        null,
        array(),
        new stdClass,
    ),
    array(
        '&\'/"' => "\r\n\t",
        '' => '',
    ),
    array(
        '0' => 'hoge',
        '1' => 'foo',
    ),
    (object)array(
        '0' => 'hoge',
        '1' => 'foo',
    ),
    array(
        '0' => 'hoge',
        '2' => 'foo',
    ),
    (object)array(
        '0' => 'hoge',
        '2' => 'foo',
    ),
);

var_dump(json_encode($var));

Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.2 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: string(148) "[["text",1,1.1,true,false,null,[],{}],{"&'\/\"":"\r\n\t","":""},["hoge","foo"],{"0":"hoge","1":"foo"},{"0":"hoge","2":"foo"},{"0":"hoge","2":"foo"}]"
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 string(148) "[["text",1,1.1,true,false,null,[],{}],{"&'\/\"":"\r\n\t","":""},["hoge","foo"],{"0":"hoge","1":"foo"},{"0":"hoge","2":"foo"},{"0":"hoge","2":"foo"}]"
Output for 5.2.0 - 5.2.1: string(142) "[["text",1,1.1,true,false,null,[],{}],{"&'\/\"":"\r\n\t"},["hoge","foo"],{"0":"hoge","1":"foo"},{"0":"hoge","2":"foo"},{"0":"hoge","2":"foo"}]"

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