API Documentation for Yii 1.1
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CJSON
| Package | system.web.helpers |
|---|---|
| Inheritance | class CJSON |
| Since | 1.0 |
| Source Code | framework/web/helpers/CJSON.php |
CJSON converts PHP data to and from JSON format.
Public Methods
| Method | Description | Defined By |
|---|---|---|
| decode() | decodes a JSON string into appropriate variable | CJSON |
| encode() | Encodes an arbitrary variable into JSON format | CJSON |
Protected Methods
| Method | Description | Defined By |
|---|---|---|
| nameValue() | array-walking function for use in generating JSON-formatted name-value pairs | CJSON |
| reduceString() | reduce a string by removing leading and trailing comments and whitespace | CJSON |
| unicodeToUTF8() | This function converts a Unicode array back to its UTF-8 representation | CJSON |
| utf16beToUTF8() | UTF-8 to UTF-16BE conversion. | CJSON |
| utf8ToUTF16BE() | UTF-8 to UTF-16BE conversion. | CJSON |
| utf8ToUnicode() | This function returns any UTF-8 encoded text as a list of | CJSON |
Method Details
decode()
method
|
public static mixed decode(string $str, boolean $useArray=true)
| ||
| $str | string | JSON-formatted string |
| $useArray | boolean | whether to use associative array to represent object data |
| {return} | mixed | number, boolean, string, array, or object corresponding to given JSON input string. Note that decode() always returns strings in ASCII or UTF-8 format! |
Source Code: framework/web/helpers/CJSON.php#331 (show)
public static function decode($str, $useArray=true)
{
if(function_exists('json_decode'))
{
$json = json_decode($str,$useArray);
// based on investigation, native fails sometimes returning null.
// see: http://gggeek.altervista.org/sw/article_20070425.html
// As of PHP 5.3.6 it still fails on some valid JSON strings
if($json !== null)
return $json;
}
$str = self::reduceString($str);
switch (strtolower($str)) {
case 'true':
return true;
case 'false':
return false;
case 'null':
return null;
default:
if (is_numeric($str)) {
// Lookie-loo, it's a number
// This would work on its own, but I'm trying to be
// good about returning integers where appropriate:
// return (float)$str;
// Return float or int, as appropriate
return ((float)$str == (integer)$str)
? (integer)$str
: (float)$str;
} elseif (preg_match('/^("|\').+(\1)$/s', $str, $m) && $m[1] == $m[2]) {
// STRINGS RETURNED IN UTF-8 FORMAT
$delim = substr($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)):
// single, escaped unicode character
$utf16 = chr(hexdec(substr($chrs, ($c+2), 2)))
. chr(hexdec(substr($chrs, ($c+4), 2)));
$utf8 .= self::utf16beToUTF8($utf16);
$c+=5;
break;
case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
$utf8 .= $chrs[$c];
break;
case ($ord_chrs_c & 0xE0) == 0xC0:
// characters U-00000080 - U-000007FF, mask 110XXXXX
//see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $c, 2);
++$c;
break;
case ($ord_chrs_c & 0xF0) == 0xE0:
// characters U-00000800 - U-0000FFFF, mask 1110XXXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $c, 3);
$c += 2;
break;
case ($ord_chrs_c & 0xF8) == 0xF0:
// characters U-00010000 - U-001FFFFF, mask 11110XXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $c, 4);
$c += 3;
break;
case ($ord_chrs_c & 0xFC) == 0xF8:
// characters U-00200000 - U-03FFFFFF, mask 111110XX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $c, 5);
$c += 4;
break;
case ($ord_chrs_c & 0xFE) == 0xFC:
// characters U-04000000 - U-7FFFFFFF, mask 1111110X
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $c, 6);
$c += 5;
break;
}
}
return $utf8;
} elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
// array, or object notation
if ($str[0] == '[') {
$stk = array(self::JSON_IN_ARR);
$arr = array();
} else {
if ($useArray) {
$stk = array(self::JSON_IN_OBJ);
$obj = array();
} else {
$stk = array(self::JSON_IN_OBJ);
$obj = new stdClass();
}
}
$stk[] = array('what' => self::JSON_SLICE, 'where' => 0, 'delim' => false);
$chrs = substr($str, 1, -1);
$chrs = self::reduceString($chrs);
if ($chrs == '') {
if (reset($stk) == self::JSON_IN_ARR) {
return $arr;
} else {
return $obj;
}
}
//print("\nparsing {$chrs}\n");
$strlen_chrs = strlen($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'] == self::JSON_SLICE))) {
// found a comma that is not inside a string, array, etc.,
// OR we've reached the end of the character list
$slice = substr($chrs, $top['where'], ($c - $top['where']));
$stk[] = array('what' => self::JSON_SLICE, 'where' => ($c + 1), 'delim' => false);
//print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
if (reset($stk) == self::JSON_IN_ARR) {
// we are in an array, so just push an element onto the stack
$arr[] = self::decode($slice,$useArray);
} elseif (reset($stk) == self::JSON_IN_OBJ) {
// we are in an object, so figure
// out the property name and set an
// element in an associative array,
// for now
if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
// "name":value pair
$key = self::decode($parts[1],$useArray);
$val = self::decode($parts[2],$useArray);
if ($useArray) {
$obj[$key] = $val;
} else {
$obj->$key = $val;
}
} elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
// name:value pair, where name is unquoted
$key = $parts[1];
$val = self::decode($parts[2],$useArray);
if ($useArray) {
$obj[$key] = $val;
} else {
$obj->$key = $val;
}
}
}
} elseif ((($chrs[$c] == '"') || ($chrs[$c] == "'")) && ($top['what'] != self::JSON_IN_STR)) {
// found a quote, and we are not inside a string
$stk[] = array('what' => self::JSON_IN_STR, 'where' => $c, 'delim' => $chrs[$c]);
//print("Found start of string at {$c}\n");
} elseif (($chrs[$c] == $top['delim']) &&
($top['what'] == self::JSON_IN_STR) &&
(($chrs[$c - 1] != "\\") ||
($chrs[$c - 1] == "\\" && $chrs[$c - 2] == "\\"))) {
// found a quote, we're in a string, and it's not escaped
array_pop($stk);
//print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
} elseif (($chrs[$c] == '[') &&
in_array($top['what'], array(self::JSON_SLICE, self::JSON_IN_ARR, self::JSON_IN_OBJ))) {
// found a left-bracket, and we are in an array, object, or slice
$stk[] = array('what' => self::JSON_IN_ARR, 'where' => $c, 'delim' => false);
//print("Found start of array at {$c}\n");
} elseif (($chrs[$c] == ']') && ($top['what'] == self::JSON_IN_ARR)) {
// found a right-bracket, and we're in an array
array_pop($stk);
//print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
} elseif (($chrs[$c] == '{') &&
in_array($top['what'], array(self::JSON_SLICE, self::JSON_IN_ARR, self::JSON_IN_OBJ))) {
// found a left-brace, and we are in an array, object, or slice
$stk[] = array('what' => self::JSON_IN_OBJ, 'where' => $c, 'delim' => false);
//print("Found start of object at {$c}\n");
} elseif (($chrs[$c] == '}') && ($top['what'] == self::JSON_IN_OBJ)) {
// found a right-brace, and we're in an object
array_pop($stk);
//print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
} elseif (($substr_chrs_c_2 == '/*') &&
in_array($top['what'], array(self::JSON_SLICE, self::JSON_IN_ARR, self::JSON_IN_OBJ))) {
// found a comment start, and we are in an array, object, or slice
$stk[] = array('what' => self::JSON_IN_CMT, 'where' => $c, 'delim' => false);
$c++;
//print("Found start of comment at {$c}\n");
} elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == self::JSON_IN_CMT)) {
// found a comment end, and we're in one now
array_pop($stk);
$c++;
for ($i = $top['where']; $i <= $c; ++$i)
$chrs = substr_replace($chrs, ' ', $i, 1);
//print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
}
}
if (reset($stk) == self::JSON_IN_ARR) {
return $arr;
} elseif (reset($stk) == self::JSON_IN_OBJ) {
return $obj;
}
}
}
}
decodes a JSON string into appropriate variable
encode()
method
|
public static string encode(mixed $var)
| ||
| $var | mixed | any number, boolean, string, array, or object to be encoded. If var is a string, it will be converted to UTF-8 format first before being encoded. |
| {return} | string | JSON string representation of input var |
Source Code: framework/web/helpers/CJSON.php#95 (show)
public static function encode($var)
{
switch (gettype($var)) {
case 'boolean':
return $var ? 'true' : 'false';
case 'NULL':
return 'null';
case 'integer':
return (int) $var;
case 'double':
case 'float':
return str_replace(',','.',(float)$var); // locale-independent representation
case 'string':
if (($enc=strtoupper(Yii::app()->charset))!=='UTF-8')
$var=iconv($enc, 'UTF-8', $var);
if(function_exists('json_encode'))
return json_encode($var);
// STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
$ascii = '';
$strlen_var = strlen($var);
/*
* Iterate over every character in the string,
* escaping with a slash or encoding to UTF-8 where necessary
*/
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:
// double quote, slash, slosh
$ascii .= '\\'.$var[$c];
break;
case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
// characters U-00000000 - U-0000007F (same as ASCII)
$ascii .= $var[$c];
break;
case (($ord_var_c & 0xE0) == 0xC0):
// characters U-00000080 - U-000007FF, mask 110XXXXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c, ord($var[$c+1]));
$c+=1;
$utf16 = self::utf8ToUTF16BE($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xF0) == 0xE0):
// characters U-00000800 - U-0000FFFF, mask 1110XXXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var[$c+1]),
ord($var[$c+2]));
$c+=2;
$utf16 = self::utf8ToUTF16BE($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xF8) == 0xF0):
// characters U-00010000 - U-001FFFFF, mask 11110XXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var[$c+1]),
ord($var[$c+2]),
ord($var[$c+3]));
$c+=3;
$utf16 = self::utf8ToUTF16BE($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xFC) == 0xF8):
// characters U-00200000 - U-03FFFFFF, mask 111110XX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var[$c+1]),
ord($var[$c+2]),
ord($var[$c+3]),
ord($var[$c+4]));
$c+=4;
$utf16 = self::utf8ToUTF16BE($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xFE) == 0xFC):
// characters U-04000000 - U-7FFFFFFF, mask 1111110X
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$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;
$utf16 = self::utf8ToUTF16BE($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
}
}
return '"'.$ascii.'"';
case 'array':
/*
* As per JSON spec if any array key is not an integer
* we must treat the the whole array as an object. We
* also try to catch a sparsely populated associative
* array with numeric keys here because some JS engines
* will create an array with empty indexes up to
* max_index which can cause memory issues and because
* the keys, which may be relevant, will be remapped
* otherwise.
*
* As per the ECMA and JSON specification an object may
* have any string as a property. Unfortunately due to
* a hole in the ECMA specification if the key is a
* ECMA reserved word or starts with a digit the
* parameter is only accessible using ECMAScript's
* bracket notation.
*/
// treat as a JSON object
if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
return '{' .
join(',', array_map(array('CJSON', 'nameValue'),
array_keys($var),
array_values($var)))
. '}';
}
// treat it like a regular array
return '[' . join(',', array_map(array('CJSON', 'encode'), $var)) . ']';
case 'object':
// Check for the JsonSerializable interface available in PHP5.4
// Note that instanceof returns false in case it doesnt know the interface.
if (interface_exists('JsonSerializable', false) && $var instanceof JsonSerializable)
{
// We use the function defined in the interface instead of json_encode.
// This way even for PHP < 5.4 one could define the interface and use it.
return self::encode($var->jsonSerialize());
}
elseif ($var instanceof Traversable)
{
$vars = array();
foreach ($var as $k=>$v)
$vars[$k] = $v;
}
else
$vars = get_object_vars($var);
return '{' .
join(',', array_map(array('CJSON', 'nameValue'),
array_keys($vars),
array_values($vars)))
. '}';
default:
return '';
}
}
Encodes an arbitrary variable into JSON format
nameValue()
method
|
protected static string nameValue(string $name, mixed $value)
| ||
| $name | string | name of key to use |
| $value | mixed | reference to an array element to be encoded |
| {return} | string | JSON-formatted name-value pair, like '"name":value' |
Source Code: framework/web/helpers/CJSON.php#290 (show)
protected static function nameValue($name, $value)
{
return self::encode(strval($name)) . ':' . self::encode($value);
}
array-walking function for use in generating JSON-formatted name-value pairs
reduceString()
method
|
protected static string reduceString(string $str)
| ||
| $str | string | string value to strip of comments and whitespace |
| {return} | string | string value stripped of comments and whitespace |
Source Code: framework/web/helpers/CJSON.php#303 (show)
protected static function reduceString($str)
{
$str = preg_replace(array(
// eliminate single line comments in '// ...' form
'#^\s*//(.+)$#m',
// eliminate multi-line comments in '/* ... */' form, at start of string
'#^\s*/\*(.+)\*/#Us',
// eliminate multi-line comments in '/* ... */' form, at end of string
'#/\*(.+)\*/\s*$#Us'
), '', $str);
// eliminate extraneous space
return trim($str);
}
reduce a string by removing leading and trailing comments and whitespace
unicodeToUTF8()
method
|
protected static string unicodeToUTF8(string &$str)
| ||
| $str | string | string to convert |
| {return} | string | |
Source Code: framework/web/helpers/CJSON.php#661 (show)
protected static function unicodeToUTF8( &$str )
{
$utf8 = '';
foreach( $str as $unicode )
{
if ( $unicode < 128 )
{
$utf8.= chr( $unicode );
}
elseif ( $unicode < 2048 )
{
$utf8.= chr( 192 + ( ( $unicode - ( $unicode % 64 ) ) / 64 ) );
$utf8.= chr( 128 + ( $unicode % 64 ) );
}
else
{
$utf8.= chr( 224 + ( ( $unicode - ( $unicode % 4096 ) ) / 4096 ) );
$utf8.= chr( 128 + ( ( ( $unicode % 4096 ) - ( $unicode % 64 ) ) / 64 ) );
$utf8.= chr( 128 + ( $unicode % 64 ) );
}
}
return $utf8;
}
This function converts a Unicode array back to its UTF-8 representation
See Also
utf16beToUTF8()
method
|
protected static string utf16beToUTF8(string &$str)
| ||
| $str | string | string to convert |
| {return} | string | |
Source Code: framework/web/helpers/CJSON.php#712 (show)
protected static function utf16beToUTF8(&$str)
{
$uni = unpack('n*',$str);
return self::unicodeToUTF8($uni);
}
UTF-8 to UTF-16BE conversion.
Maybe really UCS-2 without mb_string due to utf8ToUnicode limits
utf8ToUTF16BE()
method
|
protected static string utf8ToUTF16BE(string &$str, boolean $bom=false)
| ||
| $str | string | string to convert |
| $bom | boolean | whether to output BOM header |
| {return} | string | |
Source Code: framework/web/helpers/CJSON.php#693 (show)
protected static function utf8ToUTF16BE(&$str, $bom = false)
{
$out = $bom ? "\xFE\xFF" : '';
if(function_exists('mb_convert_encoding'))
return $out.mb_convert_encoding($str,'UTF-16BE','UTF-8');
$uni = self::utf8ToUnicode($str);
foreach($uni as $cp)
$out .= pack('n',$cp);
return $out;
}
UTF-8 to UTF-16BE conversion.
Maybe really UCS-2 without mb_string due to utf8ToUnicode limits
utf8ToUnicode()
method
|
protected static string utf8ToUnicode(string &$str)
| ||
| $str | string | string to convert |
| {return} | string | |
Source Code: framework/web/helpers/CJSON.php#623 (show)
protected static function utf8ToUnicode( &$str )
{
$unicode = array();
$values = array();
$lookingFor = 1;
for ($i = 0; $i < strlen( $str ); $i++ )
{
$thisValue = ord( $str[ $i ] );
if ( $thisValue < 128 )
$unicode[] = $thisValue;
else
{
if ( count( $values ) == 0 )
$lookingFor = ( $thisValue < 224 ) ? 2 : 3;
$values[] = $thisValue;
if ( count( $values ) == $lookingFor )
{
$number = ( $lookingFor == 3 ) ?
( ( $values[0] % 16 ) * 4096 ) + ( ( $values[1] % 64 ) * 64 ) + ( $values[2] % 64 ):
( ( $values[0] % 32 ) * 64 ) + ( $values[1] % 64 );
$unicode[] = $number;
$values = array();
$lookingFor = 1;
}
}
}
return $unicode;
}
This function returns any UTF-8 encoded text as a list of Unicode values:
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