About php JSON data formatting method
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('content-type:application/json;charset=utf8'); $arr = array( 'status' => true, 'errMsg' => '', 'member' =>array( array( 'name' => '李逍遥', 'gender' => '男' ), array( 'name' => '赵灵儿', 'gender' => '女' ) ) ); echo json_encode($arr); ?>
输出:
{"status":true,"errMsg":"","member":[{"name":"\u674e\u900d\u9065","gender":"\u7537"},{"name":"\u8d75\u7075\u513f","gender":"\u5973"}]}
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, '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'); $arr = array( 'status' => true, 'errMsg' => '', 'member' =>array( array( 'name' => '李逍遥', 'gender' => '男' ), array( 'name' => '赵灵儿', 'gender' => '女' ) ) ); echo jsonFormat($arr); ?>
输出:
{ "status":true, "errMsg":"", "member":[ { "name":"李逍遥", "gender":"男" }, { "name":"赵灵儿", "gender":"女" } ] }
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('content-type:application/json;charset=utf8'); $arr = array( 'status' => true, 'errMsg' => '', 'member' =>array( array( 'name' => '李逍遥', 'gender' => '男' ), array( 'name' => '赵灵儿', 'gender' => '女' ) ) ); echo json_encode($arr, JSON_UNESCAPED_UNICODE|JSON_PRETTY_PRINT);
<br/>输出:
{ "status": true, "errMsg": "", "member": [ { "name": "李逍遥", "gender": "男" }, { "name": "赵灵儿", "gender": "女" } ] }
<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。
<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 ' 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。
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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