Библиотека реализующая работу json_encode и json_decode для старых версий PHP(ранее 5.2)

Если Вам вдруг придётся работать с очень старым сайтом работающим на версии PHP до 5.2 и появилась необходимость обмениваться с каким либо сервером JSON данными или использовать их для других целей Вы можете подключить файл из следующего листинга для того чтобы в старых версиях PHP появились функции json_encode и json_decode аналогичные более новым версиям PHP. Для подключения сохраните код из следующего листинга например в файл libjson.php и подключите через require_once("папки_относительно_корня_сайта_до_библиотеки/libjson.php").

PHP код библиотеки реализующий функции json_encode и json_decode

<?php
define('SERVICES_JSON_SLICE',   1);
define('SERVICES_JSON_IN_STR',  2);
define('SERVICES_JSON_IN_ARR',  3);
define('SERVICES_JSON_IN_OBJ',  4);
define('SERVICES_JSON_IN_CMT', 5);
define('SERVICES_JSON_LOOSE_TYPE', 16);
define('SERVICES_JSON_SUPPRESS_ERRORS', 32);

class Services_JSON
{
    function Services_JSON($use = 0)
    {
        $this->use = $use;
    }

function utf162utf8($utf16)
    {
        if(function_exists('mb_convert_encoding')) {
            return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
        }

$bytes = (ord($utf16{0}) << 8) | ord($utf16{1});

switch(true) {
            case ((0x7F & $bytes) == $bytes):
                return chr(0x7F & $bytes);

case (0x07FF & $bytes) == $bytes:
                return chr(0xC0 | (($bytes >> 6) & 0x1F))
                     . chr(0x80 | ($bytes & 0x3F));

case (0xFFFF & $bytes) == $bytes:
                return chr(0xE0 | (($bytes >> 12) & 0x0F))
                     . chr(0x80 | (($bytes >> 6) & 0x3F))
                     . chr(0x80 | ($bytes & 0x3F));
        }

return '';
    }

function utf82utf16($utf8)
    {
        if(function_exists('mb_convert_encoding')) {
            return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
        }

switch(strlen($utf8)) {
            case 1:
                return $utf8;

case 2:
                return chr(0x07 & (ord($utf8{0}) >> 2))
                     . chr((0xC0 & (ord($utf8{0}) << 6))
                         | (0x3F & ord($utf8{1})));

case 3:
                return chr((0xF0 & (ord($utf8{0}) << 4))
                         | (0x0F & (ord($utf8{1}) >> 2)))
                     . chr((0xC0 & (ord($utf8{1}) << 6))
                         | (0x7F & ord($utf8{2})));
        }

return '';
    }

function encode($var)
    {
        switch (gettype($var)) {
            case 'boolean':
                return $var ? 'true' : 'false';

case 'NULL':
                return 'null';

case 'integer':
                return (int) $var;

case 'double':
            case 'float':
                return (float) $var;

case 'string':
                $ascii = '';
                $strlen_var = strlen($var);

for ($c = 0; $c < $strlen_var; ++$c) {

$ord_var_c = ord($var{$c});

switch (true) {
                        case $ord_var_c == 0x08:
                            $ascii .= '\b';
                            break;
                        case $ord_var_c == 0x09:
                            $ascii .= '\t';
                            break;
                        case $ord_var_c == 0x0A:
                            $ascii .= '\n';
                            break;
                        case $ord_var_c == 0x0C:
                            $ascii .= '\f';
                            break;
                        case $ord_var_c == 0x0D:
                            $ascii .= '\r';
                            break;

case $ord_var_c == 0x22:
                        case $ord_var_c == 0x2F:
                        case $ord_var_c == 0x5C:
                            $ascii .= '\\'.$var{$c};
                            break;

case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
                            $ascii .= $var{$c};
                            break;

case (($ord_var_c & 0xE0) == 0xC0):
                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
                            $c += 1;
                            $utf16 = $this->utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

case (($ord_var_c & 0xF0) == 0xE0):
                            $char = pack('C*', $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}));
                            $c += 2;
                            $utf16 = $this->utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

case (($ord_var_c & 0xF8) == 0xF0):
                            $char = pack('C*', $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}),
                                         ord($var{$c + 3}));
                            $c += 3;
                            $utf16 = $this->utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

case (($ord_var_c & 0xFC) == 0xF8):
                            $char = pack('C*', $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}),
                                         ord($var{$c + 3}),
                                         ord($var{$c + 4}));
                            $c += 4;
                            $utf16 = $this->utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

case (($ord_var_c & 0xFE) == 0xFC):
                            $char = pack('C*', $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}),
                                         ord($var{$c + 3}),
                                         ord($var{$c + 4}),
                                         ord($var{$c + 5}));
                            $c += 5;
                            $utf16 = $this->utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;
                    }
                }

return '"'.$ascii.'"';

case 'array':
                if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
                    $properties = array_map(array($this, 'name_value'),
                                            array_keys($var),
                                            array_values($var));

foreach($properties as $property) {
                        if(Services_JSON::isError($property)) {
                            return $property;
                        }
                    }

return '{' . join(',', $properties) . '}';
                }

$elements = array_map(array($this, 'encode'), $var);

foreach($elements as $element) {
                    if(Services_JSON::isError($element)) {
                        return $element;
                    }
                }

return '[' . join(',', $elements) . ']';

case 'object':
                $vars = get_object_vars($var);

$properties = array_map(array($this, 'name_value'),
                                        array_keys($vars),
                                        array_values($vars));

foreach($properties as $property) {
                    if(Services_JSON::isError($property)) {
                        return $property;
                    }
                }

return '{' . join(',', $properties) . '}';

default:
                return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
                    ? 'null'
                    : new Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
        }
    }

function name_value($name, $value)
    {
        $encoded_value = $this->encode($value);

if(Services_JSON::isError($encoded_value)) {
            return $encoded_value;
        }

return $this->encode(strval($name)) . ':' . $encoded_value;
    }

function reduce_string($str)
    {
        $str = preg_replace(array(

'#^\s*//(.+)$#m',

'#^\s*/\*(.+)\*/#Us',

'#/\*(.+)\*/\s*$#Us'

), '', $str);

return trim($str);
    }

function decode($str)
    {
        $str = $this->reduce_string($str);

switch (strtolower($str)) {
            case 'true':
                return true;

case 'false':
                return false;

case 'null':
                return null;

default:
                $m = array();

if (is_numeric($str)) {
                    return ((float)$str == (integer)$str)
                        ? (integer)$str
                        : (float)$str;

} elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
                    $delim = substr($str, 0, 1);
                    $chrs = substr($str, 1, -1);
                    $utf8 = '';
                    $strlen_chrs = strlen($chrs);

for ($c = 0; $c < $strlen_chrs; ++$c) {

$substr_chrs_c_2 = substr($chrs, $c, 2);
                        $ord_chrs_c = ord($chrs{$c});

switch (true) {
                            case $substr_chrs_c_2 == '\b':
                                $utf8 .= chr(0x08);
                                ++$c;
                                break;
                            case $substr_chrs_c_2 == '\t':
                                $utf8 .= chr(0x09);
                                ++$c;
                                break;
                            case $substr_chrs_c_2 == '\n':
                                $utf8 .= chr(0x0A);
                                ++$c;
                                break;
                            case $substr_chrs_c_2 == '\f':
                                $utf8 .= chr(0x0C);
                                ++$c;
                                break;
                            case $substr_chrs_c_2 == '\r':
                                $utf8 .= chr(0x0D);
                                ++$c;
                                break;

case $substr_chrs_c_2 == '\\"':
                            case $substr_chrs_c_2 == '\\\'':
                            case $substr_chrs_c_2 == '\\\\':
                            case $substr_chrs_c_2 == '\\/':
                                if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
                                   ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
                                    $utf8 .= $chrs{++$c};
                                }
                                break;

case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):
                                $utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
                                       . chr(hexdec(substr($chrs, ($c + 4), 2)));
                                $utf8 .= $this->utf162utf8($utf16);
                                $c += 5;
                                break;

case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
                                $utf8 .= $chrs{$c};
                                break;

case ($ord_chrs_c & 0xE0) == 0xC0:
                                $utf8 .= substr($chrs, $c, 2);
                                ++$c;
                                break;

case ($ord_chrs_c & 0xF0) == 0xE0:
                                $utf8 .= substr($chrs, $c, 3);
                                $c += 2;
                                break;

case ($ord_chrs_c & 0xF8) == 0xF0:
                                $utf8 .= substr($chrs, $c, 4);
                                $c += 3;
                                break;

case ($ord_chrs_c & 0xFC) == 0xF8:
                                $utf8 .= substr($chrs, $c, 5);
                                $c += 4;
                                break;

case ($ord_chrs_c & 0xFE) == 0xFC:
                                $utf8 .= substr($chrs, $c, 6);
                                $c += 5;
                                break;

}

return $utf8;

} elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {

if ($str{0} == '[') {
                        $stk = array(SERVICES_JSON_IN_ARR);
                        $arr = array();
                    } else {
                        if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
                            $stk = array(SERVICES_JSON_IN_OBJ);
                            $obj = array();
                        } else {
                            $stk = array(SERVICES_JSON_IN_OBJ);
                            $obj = new stdClass();
                        }
                    }

array_push($stk, array('what'  => SERVICES_JSON_SLICE,
                                           'where' => 0,
                                           'delim' => false));

$chrs = substr($str, 1, -1);
                    $chrs = $this->reduce_string($chrs);

if ($chrs == '') {
                        if (reset($stk) == SERVICES_JSON_IN_ARR) {
                            return $arr;

} else {
                            return $obj;

}
                    }

$strlen_chrs = strlen($chrs);

for ($c = 0; $c <= $strlen_chrs; ++$c) {

$top = end($stk);
                        $substr_chrs_c_2 = substr($chrs, $c, 2);

if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
                            $slice = substr($chrs, $top['where'], ($c - $top['where']));
                            array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));

if (reset($stk) == SERVICES_JSON_IN_ARR) {
                                array_push($arr, $this->decode($slice));

} elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
                                $parts = array();
                                
                                if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
                                    $key = $this->decode($parts[1]);
                                    $val = $this->decode($parts[2]);

if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
                                        $obj[$key] = $val;
                                    } else {
                                        $obj->$key = $val;
                                    }
                                } elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
                                    $key = $parts[1];
                                    $val = $this->decode($parts[2]);

if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
                                        $obj[$key] = $val;
                                    } else {
                                        $obj->$key = $val;
                                    }
                                }

}

} elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
                            array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));

} elseif (($chrs{$c} == $top['delim']) &&
                                 ($top['what'] == SERVICES_JSON_IN_STR) &&
                                 ((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1)) {
                            array_pop($stk);

} elseif (($chrs{$c} == '[') &&
                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
                            array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));

} elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
                            array_pop($stk);

} elseif (($chrs{$c} == '{') &&
                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
                            array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));

} elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
                            array_pop($stk);

} elseif (($substr_chrs_c_2 == '/*') &&
                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
                            array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
                            $c++;

} elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
                            array_pop($stk);
                            $c++;

for ($i = $top['where']; $i <= $c; ++$i)
                                $chrs = substr_replace($chrs, ' ', $i, 1);

}

if (reset($stk) == SERVICES_JSON_IN_ARR) {
                        return $arr;

} elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
                        return $obj;

}

}
        }
    }

function isError($data, $code = null)
    {
        if (class_exists('pear')) {
            return PEAR::isError($data, $code);
        } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
                                 is_subclass_of($data, 'services_json_error'))) {
            return true;
        }

return false;
    }
}

if (class_exists('PEAR_Error')) {

class Services_JSON_Error extends PEAR_Error
    {
        function Services_JSON_Error($message = 'unknown error', $code = null,
                                     $mode = null, $options = null, $userinfo = null)
        {
            parent::PEAR_Error($message, $code, $mode, $options, $userinfo);
        }
    }

} else {

class Services_JSON_Error
    {
        function Services_JSON_Error($message = 'unknown error', $code = null,
                                     $mode = null, $options = null, $userinfo = null)
        {

}
    }

}

// Эти функции были дописаны в исходную библиотеку чтобы сразу можно было вызывать json_encode и json_decode(второй параметр для создания массива так же поддерживается)
if (!function_exists('json_decode')) {
    function json_decode($content, $assoc=false) {
//        require_once 'classes/JSON.php';
        if ($assoc) {
            $json = new Services_JSON(SERVICES_JSON_LOOSE_TYPE);
        }
        else {
            $json = new Services_JSON;
        }
        return $json->decode($content);
    }
}

if (!function_exists('json_encode')) {
    function json_encode($content) {
//        require_once 'classes/JSON.php';
        $json = new Services_JSON;
        return $json->encode($content);
    }
}

PHP код библиотеки реализующий функции json_encode и json_decode

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