Project

General

Profile

Paste
Download (3.11 KB) Statistics
| Branch: | Revision:

root / drupal7 / includes / json-encode.inc @ 620f9137

1
<?php
2

    
3
/**
4
 * @file
5
 * Provides a helper to properly encode HTML-safe JSON prior to PHP 5.3.0.
6
 */
7

    
8
/**
9
 * Encodes a PHP variable to HTML-safe JSON for PHP versions below 5.3.0.
10
 *
11
 * @see drupal_json_encode()
12
 */
13
function drupal_json_encode_helper($var) {
14
  switch (gettype($var)) {
15
    case 'boolean':
16
      return $var ? 'true' : 'false'; // Lowercase necessary!
17

    
18
    case 'integer':
19
    case 'double':
20
      return $var;
21

    
22
    case 'resource':
23
    case 'string':
24
      // Always use Unicode escape sequences (\u0022) over JSON escape
25
      // sequences (\") to prevent browsers interpreting these as
26
      // special characters.
27
      $replace_pairs = array(
28
        // ", \ and U+0000 - U+001F must be escaped according to RFC 4627.
29
        '\\' => '\u005C',
30
        '"' => '\u0022',
31
        "\x00" => '\u0000',
32
        "\x01" => '\u0001',
33
        "\x02" => '\u0002',
34
        "\x03" => '\u0003',
35
        "\x04" => '\u0004',
36
        "\x05" => '\u0005',
37
        "\x06" => '\u0006',
38
        "\x07" => '\u0007',
39
        "\x08" => '\u0008',
40
        "\x09" => '\u0009',
41
        "\x0a" => '\u000A',
42
        "\x0b" => '\u000B',
43
        "\x0c" => '\u000C',
44
        "\x0d" => '\u000D',
45
        "\x0e" => '\u000E',
46
        "\x0f" => '\u000F',
47
        "\x10" => '\u0010',
48
        "\x11" => '\u0011',
49
        "\x12" => '\u0012',
50
        "\x13" => '\u0013',
51
        "\x14" => '\u0014',
52
        "\x15" => '\u0015',
53
        "\x16" => '\u0016',
54
        "\x17" => '\u0017',
55
        "\x18" => '\u0018',
56
        "\x19" => '\u0019',
57
        "\x1a" => '\u001A',
58
        "\x1b" => '\u001B',
59
        "\x1c" => '\u001C',
60
        "\x1d" => '\u001D',
61
        "\x1e" => '\u001E',
62
        "\x1f" => '\u001F',
63
        // Prevent browsers from interpreting these as as special.
64
        "'" => '\u0027',
65
        '<' => '\u003C',
66
        '>' => '\u003E',
67
        '&' => '\u0026',
68
        // Prevent browsers from interpreting the solidus as special and
69
        // non-compliant JSON parsers from interpreting // as a comment.
70
        '/' => '\u002F',
71
        // While these are allowed unescaped according to ECMA-262, section
72
        // 15.12.2, they cause problems in some JSON parsers.
73
        "\xe2\x80\xa8" => '\u2028', // U+2028, Line Separator.
74
        "\xe2\x80\xa9" => '\u2029', // U+2029, Paragraph Separator.
75
      );
76

    
77
      return '"' . strtr($var, $replace_pairs) . '"';
78

    
79
    case 'array':
80
      // Arrays in JSON can't be associative. If the array is empty or if it
81
      // has sequential whole number keys starting with 0, it's not associative
82
      // so we can go ahead and convert it as an array.
83
      if (empty($var) || array_keys($var) === range(0, sizeof($var) - 1)) {
84
        $output = array();
85
        foreach ($var as $v) {
86
          $output[] = drupal_json_encode_helper($v);
87
        }
88
        return '[ ' . implode(', ', $output) . ' ]';
89
      }
90
      // Otherwise, fall through to convert the array as an object.
91

    
92
    case 'object':
93
      $output = array();
94
      foreach ($var as $k => $v) {
95
        $output[] = drupal_json_encode_helper(strval($k)) . ':' . drupal_json_encode_helper($v);
96
      }
97
      return '{' . implode(', ', $output) . '}';
98

    
99
    default:
100
      return 'null';
101
  }
102
}