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About php JSON data formatting method

Jun 09, 2018 am 11:55 AM
php format

php 的json_encode能把数组转换为json格式的字符串。字符串没有缩进,中文会转为unicode编码,例如\u975a\u4ed4。人阅读比较困难。现在这个方法在json_encode的基础上再进行一次美化处理。使人能方便阅读内容。

1. 使用 json_encode 输出

<?php
header(&#39;content-type:application/json;charset=utf8&#39;);
$arr = array(
    &#39;status&#39; => true,
    &#39;errMsg&#39; => &#39;&#39;,
    &#39;member&#39; =>array(
        array(
            &#39;name&#39; => &#39;李逍遥&#39;,
            &#39;gender&#39; => &#39;男&#39;
        ),
        array(
            &#39;name&#39; => &#39;赵灵儿&#39;,
            &#39;gender&#39; => &#39;女&#39;
        )
    )
);
echo json_encode($arr);
?>
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输出:

{"status":true,"errMsg":"","member":[{"name":"\u674e\u900d\u9065","gender":"\u7537"},{"name":"\u8d75\u7075\u513f","gender":"\u5973"}]}
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可以看出,这种格式人阅读很困难。

2. 使用 jsonFormat 输出

<?php
/** Json数据格式化
* @param  Mixed  $data   数据
* @param  String $indent 缩进字符,默认4个空格
* @return JSON
*/
function jsonFormat($data, $indent=null){
    // 对数组中每个元素递归进行urlencode操作,保护中文字符
    array_walk_recursive($data, &#39;jsonFormatProtect&#39;);
    // json encode
    $data = json_encode($data);
    // 将urlencode的内容进行urldecode
    $data = urldecode($data);
    // 缩进处理
    $ret = &#39;&#39;;
    $pos = 0;
    $length = strlen($data);
    $indent = isset($indent)? $indent : &#39;    &#39;;
    $newline = "\n";
    $prevchar = &#39;&#39;;
    $outofquotes = true;
    for($i=0; $i<=$length; $i++){
        $char = substr($data, $i, 1);
        if($char==&#39;"&#39; && $prevchar!=&#39;\\&#39;){
            $outofquotes = !$outofquotes;
        }elseif(($char==&#39;}&#39; || $char==&#39;]&#39;) && $outofquotes){
            $ret .= $newline;
            $pos --;
            for($j=0; $j<$pos; $j++){
                $ret .= $indent;
            }
        }
        $ret .= $char;
        
        if(($char==&#39;,&#39; || $char==&#39;{&#39; || $char==&#39;[&#39;) && $outofquotes){
            $ret .= $newline;
            if($char==&#39;{&#39; || $char==&#39;[&#39;){
                $pos ++;
            }
            for($j=0; $j<$pos; $j++){
                $ret .= $indent;
            }
        }
        $prevchar = $char;
    }
    return $ret;
}
/** 将数组元素进行urlencode
* @param String $val
*/
function jsonFormatProtect(&$val){
    if($val!==true && $val!==false && $val!==null){
        $val = urlencode($val);
    }
}
header(&#39;content-type:application/json;charset=utf8&#39;);
$arr = array(
    &#39;status&#39; => true,
    &#39;errMsg&#39; => &#39;&#39;,
    &#39;member&#39; =>array(
        array(
            &#39;name&#39; => &#39;李逍遥&#39;,
            &#39;gender&#39; => &#39;男&#39;
        ),
        array(
            &#39;name&#39; => &#39;赵灵儿&#39;,
            &#39;gender&#39; => &#39;女&#39;
        )
    )
);
echo jsonFormat($arr);
?>
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输出:

{
    "status":true,
    "errMsg":"",
    "member":[
        {
            "name":"李逍遥",
            "gender":"男"
        },
        {
            "name":"赵灵儿",
            "gender":"女"
        }
    ]
}
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php5.4 以后,json_encode增加了JSON_UNESCAPED_UNICODE ,JSON_PRETTY_PRINT 等几个常量参数。使显示中文与格式化更方便。

header(&#39;content-type:application/json;charset=utf8&#39;);  
  
$arr = array(  
    &#39;status&#39; => true,  
    &#39;errMsg&#39; => &#39;&#39;,  
    &#39;member&#39; =>array(  
        array(  
            &#39;name&#39; => &#39;李逍遥&#39;,  
            &#39;gender&#39; => &#39;男&#39;  
        ),  
        array(  
            &#39;name&#39; => &#39;赵灵儿&#39;,  
            &#39;gender&#39; => &#39;女&#39;  
        )  
    )  
);  
  
echo json_encode($arr, JSON_UNESCAPED_UNICODE|JSON_PRETTY_PRINT);
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<br/>输出:

{
    "status": true,
    "errMsg": "",
    "member": [
        {
            "name": "李逍遥",
            "gender": "男"
        },
        {
            "name": "赵灵儿",
            "gender": "女"
        }
    ]
}
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<br/>JSON常量参数说明:

以下常量表示了 json_last_error() 所返回的错误类型。

JSON_ERROR_NONE (integer)
没有错误发生。自 PHP 5.3.0 起生效。
JSON_ERROR_DEPTH (integer)
到达了最大堆栈深度。自 PHP 5.3.0 起生效。
JSON_ERROR_STATE_MISMATCH (integer)
出现了下溢(underflow)或者模式不匹配。自 PHP 5.3.0 起生效。
JSON_ERROR_CTRL_CHAR (integer)
控制字符错误,可能是编码不对。自 PHP 5.3.0 起生效。
JSON_ERROR_SYNTAX (integer)
语法错误。 自 PHP 5.3.0 起生效。
JSON_ERROR_UTF8 (integer)
异常的 UTF-8 字符,也许是因为不正确的编码。 此常量自 PHP 5.3.1 起生效。
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<br/>下面的常量可以和 json_encode() 的 form 选项结合使用。

JSON_HEX_TAG (integer)
所有的 < 和 > 转换成 \u003C 和 \u003E。 自 PHP 5.3.0 起生效。
JSON_HEX_AMP (integer)
所有的 & 转换成 \u0026。 自 PHP 5.3.0 起生效。
JSON_HEX_APOS (integer)
所有的 &#39; 转换成 \u0027。 自 PHP 5.3.0 起生效。
JSON_HEX_QUOT (integer)
所有的 " 转换成 \u0022。 自 PHP 5.3.0 起生效。
JSON_FORCE_OBJECT (integer)
使一个非关联数组输出一个类(Object)而非数组。 在数组为空而接受者需要一个类(Object)的时候尤其有用。 自 PHP 5.3.0 起生效。
JSON_NUMERIC_CHECK (integer)
将所有数字字符串编码成数字(numbers)。 自 PHP 5.3.3 起生效。
JSON_BIGINT_AS_STRING (integer)
将大数字编码成原始字符原来的值。 自 PHP 5.4.0 起生效。
JSON_PRETTY_PRINT (integer)
用空白字符格式化返回的数据。 自 PHP 5.4.0 起生效。
JSON_UNESCAPED_SLASHES (integer)
不要编码 /。 自 PHP 5.4.0 起生效。
JSON_UNESCAPED_UNICODE (integer)
以字面编码多字节 Unicode 字符(默认是编码成 \uXXXX)。 自 PHP 5.4.0 起生效。
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本文讲解了php JSON数据格式化的方法,更多相关内容请关注php中文网。

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