PHP Fatal error:call to undefined function json_decode ()

php:5.5, operating system: ubuntu13.10

The website text Editor uses the Ueditor, the test upload picture displays the background configuration item not to load successfully, the upload plugin cannot use normally.

Consulted the Ueditor documentation, about running the test first access to ueditor/controller.php, prompt error, and then access Ueditor/php/controller.php?action=config, prompting PHP Fatal Error:call to undefined function json_decode (). The reason is that JSON-related functions are defined.

Looking at the official PHP documentation, the JSON extension has been supported since php5.2, possibly by accidentally deleting the JSON component and reinstalling it.

　　sudo apt-get install php5-json

sudo service nginx restart

sudo php5-fpm restart

Problem solving

If the PHP version is too low to upgrade to 5.2, do not want to reinstall PHP, you can customize the functions Json_encode and Json_decode

functionJson_encode ($data ) {    if(Is_array($data) ||Is_object($data) ) {        $islist=Is_array($data) && (Empty($data) ||Array_keys($data) ===Range(0,Count($data)-1) ); if($islist ) {            $json= ' ['.implode(‘,‘,Array_map(' __json_encode ',$data) ) . ‘]‘; } Else {            $items=Array(); foreach($data  as $key=$value ) {                $items[] = __json_encode ("$key") . ‘:‘ . __json_encode ($value); }            $json= ' {'.implode(‘,‘,$items) . ‘}‘; }    } ElseIf(is_string($data) ) {        #Escape non-printable or non-ascii characters.        #I also put the \ character first, as suggested in comments on the ' addclashes ' page.        $string= ' "'.addcslashes($data, "\\\" \n\r\t/".CHR(8).CHR(12)). ‘"‘; $json= ' '; $len=strlen($string); #Convert UTF-8 to hexadecimal codepoints.         for($i= 0;$i<$len;$i++ ) {            $char=$string[$i]; $c 1=Ord($char); #Single byte;            if($c 1<128 ) {            $json.= ($c 1> 31)?$char:sprintf("\\u%04x",$c 1); Continue; }            #Double byte            $c 2=Ord($string[++$i]); if( ($c 1& 32) = = = 0 ) {            $json.=sprintf("\\u%04x", ($c 1-192) * 64 +$c 2-128); Continue; }                #Triple                $c 3=Ord($string[++$i]); if( ($c 1& 16) = = = 0 ) {                $json.=sprintf("\\u%04x", ($c 1-224) <<12) + (($c 2-+) << 6) + ($c 3-128)); Continue; }        #Quadruple        $c 4=Ord($string[++$i]); if( ($c 1& 8) = = = 0 ) {                    $u= (($c 1&) << 2) + (($c 2&GT;&GT;4) & 3)-1; $w 1= (54<<10) + ($u&LT;&LT;6) + (($c 2&) << 2) + (($c 3&GT;&GT;4) & 3); $w 2= (55<<10) + (($c 3& <<6) + ($c 4-128); $json.=sprintf("\\u%04x\\u%04x",$w 1,$w 2); }                    }                    } Else {                    #int, floats, bools, null                    $json=Strtolower(Var_export($data,true )); }                    return $json; }    functionJson_decode ($json)    {        $comment=false; $out= ' $x = ';  for($i= 0;$i<strlen($json);$i++)        {        if(!$comment)            {            if(($json[$i] = = ' {') | | ($json[$i] = = ' [')]$out. = ' Array ('; Else if(($json[$i] = = '} ') | | ($json[$i] = = ['] '))$out. = ') '; Else if($json[$i] = = ': ')$out. = ' = '; Else $out.=$json[$i]; }        Else $out.=$json[$i]; if($json[$i] = = ' "' &&$json[($i-1)]!= "\")$comment= !$comment; }            Eval($out. ‘;‘); return $x; }

PHP Fatal error:call to undefined function json_decode ()