3v4l.org

run code in 300+ PHP versions simultaneously

@ 2013-07-08T19:01:21Z

<?php
 
if (!function_exists('json_encode')) {
    
    function json_encode($it) {
        $tmp = $it;
        if (!mb_convert_variables('UTF-8', 'UTF-8', $tmp)) {
            return false;
        }
        if (!($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) {
                $k = _js_enc_value($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 is_bool($value): 
                return $value ? 'true' : 'false';
            case $value === null:
            case is_resource($value) && _js_error():
                return 'null';
            case is_string($value):
                return _js_uc_esc($value);
            default:
                return $value;   
        }
    }
    
    function _js_error() {
        return trigger_error(
            'json_encode(): type is unsupported, encoded as null',
            E_USER_WARNING
        );
    }
    
    function _js_uc_esc($value) {
        $pattern = "@[\x08-\x10\x0c\x0d\\\\\"/]|([^\x08-\x10\x0c\x0d\x32-\x7f\\\\\"/])++@";
        return '"' . preg_replace_callback($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\x10\x0c\x0d\\\"/");
        }
    }

}

$str = '';
for ($i=0;$i<=300;$i++) {
    $str .= chr($i);
}
$str .= chr(127);
var_dump(json_encode(array("test" => $str)));

Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 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 - 8.3.6: bool(false)
Output for 5.2.7 - 5.2.17, 5.3.0 - 5.3.13, 5.3.15 - 5.3.29, 5.4.0 - 5.4.45: string(13) "{"test":null}"
Output for 5.3.14: Warning: json_encode(): Invalid UTF-8 sequence in argument in /in/i3bd5 on line 98 bool(false)
Output for 5.2.2 - 5.2.6: string(282) "{"test":"\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\b\t\n\u000b\f\r\u000e\u000f\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f !\"#$%&'()*+,-.\/0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"}"
Output for 5.2.0 - 5.2.1: string(147) "{"test":"\b\t\n\f\r !\"#$%&'()*+,-.\/0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"}"
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: string(573) "{"test":"\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\b\t \f\r\020\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f\u0020\u0021\"\u0023\u0024\u0025\u0026\u0027\u0028\u0029\u002a\u002b\u002c\u002d\u002e\/\u0030\u003123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\b\t \f\r\020\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f\u0020\u0021\"\u0023\u0024\u0025\u0026\u0027\u0028\u0029\u002a\u002b\u002c"}"

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