关于PHP在数组对象与JSON数据之间的转换问题(编码问题)
PHP在 5.x以后提供json_ecode 与 json_decode 两个函数来处理 数组与JSON数据之间的转换。但是它们并未很好的处理存在UTF-8或者GBK中文字符的数组，常常会返回NULL值。下面有两个函数可以代替它们来使用：
//数组转换成JSON格式核心函数
function array2json($arr) {
// if(function_exists('json_encode')) return json_encode($arr); //Lastest versions of PHP already has this functionality.
$parts = array();
$is_list = false;
//Find out if the given array is a numerical array
$keys = array_keys($arr);
$max_length = count($arr)-1;
if(($keys[0] == 0) and ($keys[$max_length] == $max_length)) {//See if the first key is 0 and last key is length - 1
$is_list = true;
for($i=0; $i<count($keys); $i++) { //See if each key correspondes to its position
if($i != $keys[$i]) { //A key fails at position check.
$is_list = false; //It is an associative array.
break;
}
}
}
foreach($arr as $key=>$value) {
if(is_array($value)) { //Custom handling for arrays
if($is_list) $parts[] = array2json($value); /* :RECURSION: */
else $parts[] = '"' . $key . '":' . array2json($value); /* :RECURSION: */
} else {
$str = '';
if(!$is_list) $str = '"' . $key . '":';
//Custom handling for multiple data types
if(is_numeric($value)) $str .= $value; //Numbers
elseif($value === false) $str .= 'false'; //The booleans
elseif($value === true) $str .= 'true';
else $str .= '"' . addslashes($value) . '"'; //All other things
// :TODO: Is there any more datatype we should be in the lookout for? (Object?)
$parts[] = $str;
}
}
$json = implode(',',$parts);
if($is_list) return '[' . $json . ']';//Return numerical JSON
return '{' . $json . '}';//Return associative JSON
}
//下面是将JSON转换成数组，分为UTF-8格式的和GBK格式，用法如下：
/*$array_gbk = jsonDecode( $jsonString );
$array_utf8 = jsonDecode( $jsonString , 'utf-8' ); */
function unicode_encode($name)
{
$name = iconv('UTF-8', 'UCS-2', $name);
$len = strlen($name);
$str = '';
for ($i = 0; $i < $len - 1; $i = $i + 2)
{
$c = $name[$i];
$c2 = $name[$i + 1];
if (ord($c) > 0)
{ //两个字节的文字
$str .= '/u'.base_convert(ord($c), 10, 16).base_convert(ord($c2), 10, 16);
}
else
{
$str .= $c2;
}
}
return $str;
}
//将UNICODE编码后的内容进行解码
function unicode_decode($name)
{
//转换编码，将Unicode编码转换成可以浏览的utf-8编码
$pattern = '/(///u([/w]{4}))/i';
$name = preg_replace_callback( $pattern , '_unicode_decode' , $name );
return $name;
}
function _unicode_decode( $str ) {
$str = $str[0];
$name = '';
$code = base_convert(substr($str, 2, 2), 16, 10);
$code2 = base_convert(substr($str, 4), 16, 10);
$c = chr($code).chr($code2);
$c = iconv('UCS-2', 'UTF-8', $c);
$name .= $c;
return $name;
}
function jsonDecode( $json , $to_encode = 'gbk' , & $i = 0 ) {
if ( null === $i ) {
$i = 0;
}
for( ; $i < strlen( $json ) ; $i ++ ) {
$chr = $json[$i];
switch( $chr ) {
case '"' :
case "'" :
//字符串
$i ++;
$val = '';
while( $json[$i] != $chr || $lastChr == '//' ) {
$lastChr = $json[$i];
$val .= $lastChr;
$i ++;
}
++ $i;
//字符串处理
//unicode 转汉字
$val = unicode_decode( $val );
if ( strtolower( str_ireplace( '-' , '' , $to_encode ) ) !== 'utf8' ) {
$val = mb_convert_encoding( $val , $to_encode , 'utf-8' );
}
$val = stripslashes( $val );
return $val;
break;
case 'a' :
case 'b' :
case 'c' :
case 'd':
case 'e':
case 'f':
case 'g':
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o':
case 'p':
case 'q':
case 'r':
case 's':
case 't':
case 'u':
case 'v':
case 'w':
case 'x':
case 'y':
case 'z':
case 'A' :
case 'B' :
case 'C' :
case 'D':
case 'E':
case 'F':
case 'G':
case 'H':
case 'I':
case 'J':
case 'K':
case 'L':
case 'M':
case 'N':
case 'O':
case 'P':
case 'Q':
case 'R':
case 'S':
case 'T':
case 'U':
case 'V':
case 'W':
case 'X':
case 'Y':
case 'Z':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
//字符串
if ( trim( $chr ) === '' ) {
continue;
}
$val = $chr;
while( preg_match( '#^[a-zA-Z0-9/.]$#' , $json[++$i] ) ) {
$val .= $json[$i];
}
$lVal = strtolower( $val );
if ( $lVal == 'true' ) {
return true;
}
if ( $lVal == 'false' ) {
return false;
}
if ( preg_match( '#^[0-9/.]+$#' , $lVal ) ) {
return $val + 0;
}
return $val;
case '{' :
$val = array();
$i ++;
$key = '';
while( $json[$i] != '}' ) {
$key .= $json[$i];
$i ++;
if ( $json[$i] == ':' ) {
$key = ltrim( $key );
$key = ltrim( $key , ',' ); //去除,
$key = trim( $key );//去两边的空白
if ( preg_match( '#^"(.+?)"$#' , $key , $m ) ) {
$key = $m[1];
}
if ( preg_match( '#^/'(.+?)/'$#' , $key , $m ) ) {
$key = $m[1];
}
++ $i;
$val[$key] = jsonDecode( $json , $to_encode , $i );
$key = '';
}
}
++ $i;
return $val;
break;
case '[' :
$val = array();
$i ++;
$t = 0;
while( $json[$i] != ']' ) {
if ( $json[$i] == ',' ) {
$i ++;
continue;
}
$val[] = jsonDecode( $json , $to_encode , $i );
}
$i ++;
return $val;
break;
}
}
return NULL ;
}
