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<?php
/**
* @file
* Provides a helper to properly encode HTML-safe JSON prior to PHP 5.3.0.
*/
/**
* Encodes a PHP variable to HTML-safe JSON for PHP versions below 5.3.0.
*
* @see drupal_json_encode()
*/
function drupal_json_encode_helper($var) {
switch (gettype($var)) {
case 'boolean':
return $var ? 'true' : 'false'; // Lowercase necessary!
case 'integer':
case 'double':
return $var;
case 'resource':
case 'string':
// Always use Unicode escape sequences (\u0022) over JSON escape
// sequences (\") to prevent browsers interpreting these as
// special characters.
$replace_pairs = array(
// ", \ and U+0000 - U+001F must be escaped according to RFC 4627.
'\\' => '\u005C',
'"' => '\u0022',
"\x00" => '\u0000',
"\x01" => '\u0001',
"\x02" => '\u0002',
"\x03" => '\u0003',
"\x04" => '\u0004',
"\x05" => '\u0005',
"\x06" => '\u0006',
"\x07" => '\u0007',
"\x08" => '\u0008',
"\x09" => '\u0009',
"\x0a" => '\u000A',
"\x0b" => '\u000B',
"\x0c" => '\u000C',
"\x0d" => '\u000D',
"\x0e" => '\u000E',
"\x0f" => '\u000F',
"\x10" => '\u0010',
"\x11" => '\u0011',
"\x12" => '\u0012',
"\x13" => '\u0013',
"\x14" => '\u0014',
"\x15" => '\u0015',
"\x16" => '\u0016',
"\x17" => '\u0017',
"\x18" => '\u0018',
"\x19" => '\u0019',
"\x1a" => '\u001A',
"\x1b" => '\u001B',
"\x1c" => '\u001C',
"\x1d" => '\u001D',
"\x1e" => '\u001E',
"\x1f" => '\u001F',
// Prevent browsers from interpreting these as as special.
"'" => '\u0027',
'<' => '\u003C',
'>' => '\u003E',
'&' => '\u0026',
// Prevent browsers from interpreting the solidus as special and
// non-compliant JSON parsers from interpreting // as a comment.
'/' => '\u002F',
// While these are allowed unescaped according to ECMA-262, section
// 15.12.2, they cause problems in some JSON parsers.
"\xe2\x80\xa8" => '\u2028', // U+2028, Line Separator.
"\xe2\x80\xa9" => '\u2029', // U+2029, Paragraph Separator.
);
return '"' . strtr($var, $replace_pairs) . '"';
case 'array':
// Arrays in JSON can't be associative. If the array is empty or if it
// has sequential whole number keys starting with 0, it's not associative
// so we can go ahead and convert it as an array.
if (empty($var) || array_keys($var) === range(0, sizeof($var) - 1)) {
$output = array();
foreach ($var as $v) {
$output[] = drupal_json_encode_helper($v);
}
return '[ ' . implode(', ', $output) . ' ]';
}
// Otherwise, fall through to convert the array as an object.
case 'object':
$output = array();
foreach ($var as $k => $v) {
$output[] = drupal_json_encode_helper(strval($k)) . ':' . drupal_json_encode_helper($v);
}
return '{' . implode(', ', $output) . '}';
default:
return 'null';
}
}
