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