php json_encode函数的替代方法(可显示中文)

发布时间:2020-10-23编辑:脚本学堂
介绍下如何在php中编写json_encode函数的替代方法,出自php在线手册中的一个示例,有需要的朋友,可以参考下。

json_encode是ajax应用中的一个函数,json_encode的使用条件比较苛刻的,需要在php 5.2.0以上并且需要PECL json在1.2.0以上才可以使用。

本文提供的json_encode的替代方法,出自php在线手册中一个示例,经测试完全可用。
代码如下:
 

复制代码 代码示例:
<?php
/**
 * json_encode的替代函数
 * Edit www.jb200.com
*/
    function jsonEncode($var) { 
        if (function_exists('json_encode')) { 
            return json_encode($var); 
        } else { 
            switch (gettype($var)) { 
                case 'boolean': 
                    return $var ? 'true' : 'false'; // Lowercase necessary! 
                case 'integer': 
                case 'double': 
                    return $var; 
                case 'resource': 
                case 'string': 
                    return '"'. str_replace(array("r", "n", "<", ">", "&"), 
                        array('r', 'n', 'x3c', 'x3e', 'x26'), 
                        addslashes($var)) .'"'; 
                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 (emptyempty ($var) || array_keys($var) === range(0, sizeof($var) - 1)) { 
                        $output = array(); 
                        foreach ($var as $v) { 
                            $output[] = jsonEncode($v); 
                        } 
                        return '[ '. implode(', ', $output) .' ]'; 
                    } 
                    // Otherwise, fall through to convert the array as an object. 
                case 'object': 
                    $output = array(); 
                    foreach ($var as $k => $v) { 
                        $output[] = jsonEncode(strval($k)) .': '. jsonEncode($v); 
                    } 
                    return '{ '. implode(', ', $output) .' }'; 
                default: 
                    return 'null'; 
            } 
        } 
    }
     
    echo jsonEncode(array('first'=>'testing','second'=>'tangjili')); 
?>

也可以是下面这样的代码。
 

复制代码 代码示例:
<?php 
    function php_json_encode( $data ) { 
        if( is_array($data) || is_object($data) ) { 
            $islist = is_array($data) && ( emptyempty($data) || array_keys($data) === range(0,count($data)-1) ); 
            if( $islist ) $json = '[' . implode(',', array_map('php_json_encode', $data) ) . ']'; 
            else { 
                $items = Array(); 
                foreach( $data as $key => $value ) $items[] = php_json_encode("$key") . ':' . php_json_encode($value); 
                $json = '{' . implode(',', $items) . '}'; 
            } 
        } elseif( is_string($data) ) { 
            $string = '"' . addcslashes($data, ""nrt/" . chr(8) . chr(12)) . '"'; 
     
            $json    = ''; 
            $len    = strlen($string); 
            for( $i = 0; $i < $len; $i++ ) { 
                $char = $string[$i]; 
     
                $c1 = ord($char); 
                if( $c1 <128 ) { $json .= ($c1 > 31) ? $char : sprintf("u%04x", $c1); continue; } 
                $c2 = ord($string[++$i]); 
                if ( ($c1 & 32) === 0 ) { $json .= sprintf("u%04x", ($c1 - 192) * 64 + $c2 - 128); continue; } 
                $c3 = ord($string[++$i]); 
                if( ($c1 & 16) === 0 ) { $json .= sprintf("u%04x", (($c1 - 224) <<12) + (($c2 - 128) << 6) + ($c3 - 128)); continue; } 
                $c4 = ord($string[++$i]); 
                if( ($c1 & 8 ) === 0 ) { 
                    $u = (($c1 & 15) << 2) + (($c2>>4) & 3) - 1; 
                    $w1 = (54<<10) + ($u<<6) + (($c2 & 15) << 2) + (($c3>>4) & 3); 
                    $w2 = (55<<10) + (($c3 & 15)<<6) + ($c4-128); 
                    $json .= sprintf("u%04xu%04x", $w1, $w2); 
                } 
            } 
        }  
        else $json = strtolower(var_export( $data, true )); 
         
        return $json; 
    }
    echo php_json_encode(array('first'=>'testing')); 
?>

中文的话,可以结合如下的函数来使用。
 

复制代码 代码示例:
<?php
    function arrayRecursive(&$array, $function, $apply_to_keys_also = false) 
    { 
        foreach ($array as $key => $value) { 
            if (is_array($value)) arrayRecursive($array[$key], $function, $apply_to_keys_also); 
            else $array[$key] = $function($value); 
     
            if ($apply_to_keys_also && is_string($key)) { $new_key = $function($key); if ($new_key != $key) { $array[$new_key] = $array[$key]; unset($array[$key]); } } 
        } 
    } 
?>

调用示例:
 

复制代码 代码示例:
<?php
    function JSON($array) { 
        arrayRecursive($array, 'urlencode', true); 
        $json = jsonEncode($array); // 或者 $json = php_json_encode($array); 
        return urldecode($json); 
    } 
     
    echo JSON(array('first'=>'testing','second'=>'中文'));
?>