A brief discussion on the method of formatting PHP json data

this article will introduce you to the method of formatting php json data. it has certain reference value. friends in need can refer to it. i hope it will be helpful to everyone.

php's json_encode can convert the array into a string in json format. the string is not indented, and chinese characters will be converted to unicode encoding, such as \u975a\u4ed4. it is difficult for people to read.

now this method is beautified again based on json_encode. make it easier for people to read the content.

1. use json_encode output

<?php  
  
header('content-type:application/json;charset=utf8');  
  
$arr = array(  
    'status' => true,  
    'errmsg' => '',  
    'member' =>array(  
        array(  
            'name' => '张三',  
            'gender' => '男'  
        ),  
        array(  
            'name' => '李四',  
            'gender' => '女'  
        )  
    )  
);  
  
echo json_encode($arr);  
  
?>

output:

{"status":true,"errmsg":"","member":[{"name":"\u674e\u900d\u9065","gender":"\u7537"},{"name":"\u8d75\u7075\u513f","gender":"\u5973"}]} 　

it can be seen that this format is very difficult for people to read.

2. use jsonformat to output

<?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, 'jsonformatprotect');  
  
    // json encode  
    $data = json_encode($data);  
  
    // 将urlencode的内容进行urldecode  
    $data = urldecode($data);  
  
    // 缩进处理  
    $ret = '';  
    $pos = 0;  
    $length = strlen($data);  
    $indent = isset($indent)? $indent : '    ';  
    $newline = "\n";  
    $prevchar = '';  
    $outofquotes = true;  
  
    for($i=0; $i<=$length; $i++){  
  
        $char = substr($data, $i, 1);  
  
        if($char=='"' && $prevchar!='\\'){  
            $outofquotes = !$outofquotes;  
        }elseif(($char=='}' || $char==']') && $outofquotes){  
            $ret .= $newline;  
            $pos --;  
            for($j=0; $j<$pos; $j++){  
                $ret .= $indent;  
            }  
        }  
  
        $ret .= $char;  
          
        if(($char==',' || $char=='{' || $char=='[') && $outofquotes){  
            $ret .= $newline;  
            if($char=='{' || $char=='['){  
                $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('content-type:application/json;charset=utf8');  
  
$arr = array(  
    'status' => true,  
    'errmsg' => '',  
    'member' =>array(  
        array(  
            'name' => '张三',  
            'gender' => '男'  
        ),  
        array(  
            'name' => '李四',  
            'gender' => '女'  
        )  
    )  
);  
  
echo jsonformat($arr);  
  
?> 　

output:

{  
    "status":true,  
    "errmsg":"",  
    "member":[  
        {  
            "name":"张三",  
            "gender":"男"  
        },  
        {  
            "name":"李四",  
            "gender":"女"  
        }  
    ]  
}

after php5.4, json_encode adds json_unescaped_unicode, json_pretty_print, etc. a constant parameter. make displaying chinese and formatting more convenient.

header('content-type:application/json;charset=utf8');    
    
$arr = array(    
    'status' => true,    
    'errmsg' => '',    
    'member' =>array(    
        array(    
            'name' => '张三',    
            'gender' => '男'    
        ),    
        array(    
            'name' => '李四',    
            'gender' => '女'    
        )    
    )    
);    
    
echo json_encode($arr, json_unescaped_unicode|json_pretty_print); 　

output:

{  
    "status": true,  
    "errmsg": "",  
    "member": [  
        {  
            "name": "张三",  
            "gender": "男"  
        },  
        {  
            "name": "李四",  
            "gender": "女"  
        }  
    ]  
}

json constant parameter description: the following constants represent the error type returned by json_last_error().

json_error_none (integer)

no error occurred. effective as of php 5.3.0.

json_error_depth (integer)

the maximum stack depth has been reached. effective as of php 5.3.0.

json_error_state_mismatch (integer)

an underflow or pattern mismatch occurred. effective as of php 5.3.0.

json_error_ctrl_char (integer)

the control character is wrong, maybe the encoding is wrong. effective as of php 5.3.0.

json_error_syntax (integer)

syntax error. effective as of php 5.3.0.

json_error_utf8 (integer)

exceptional utf-8 characters, perhaps due to incorrect encoding. this constant is available since php 5.3.1.

the following constants can be used in conjunction with the form option of json_encode().

json_hex_tag (integer)

all < and > are converted to \u003c and \u003e. effective as of php 5.3.0.

json_hex_amp (integer)

all &s are converted to \u0026. effective as of php 5.3.0.

json_hex_apos (integer)

all ' are converted to \u0027. effective as of php 5.3.0.

json_hex_quot (integer)

all " are converted to \u0022. effective since php 5.3.0.

json_force_object (integer)

causes a non-associative array to output a class (object) instead of an array. in the array: especially useful when empty and the receiver requires an object. effective as of php 5.3.0.

json_numeric_check (integer)

encode all numeric strings into numbers. effective as of php 5.3.3 .

json_bigint_as_string (integer)

encode large numbers into the original value of the original character. effective since php 5.4.0.

json_pretty_print (integer)

format the returned data with whitespace characters. since php 5.4.0 effective as of php 5.4.0.

json_unescaped_slashes (integer)

do not encode /. effective as of php 5.4.0.

JSON_UNESCAPED_UNICODE (integer)

encode multibyte unicode characters literally (the default is to encode \uxxxx). since php effective from 5.4.0.

recommended learning: "php video tutorial" p>