JSON解码/编码失去换行/文件结构？

Question

这个php脚本将一个元素添加到其中一个JSON对象（数组）。

#!/usr/bin/php 
<?php 

$filename = 'composer.json'; 
$obj = json_decode(file_get_contents($filename, true)); 

if (null === $obj) { 
    throw new Exception(json_last_error()); // this will just be an error code 
} 

$obj->require = (object) array_merge((array) $obj->require, array('friendsofsymfony/user-bundle' => "*")); 

file_put_contents(
    $filename, 
    json_encode($obj) 
); 

问题是，它弄乱了文件格式。

使用脚本之前，文件我的编辑是这样的：

{ 
    "name": "symfony/framework-standard-edition", 
    "description": "The \"Symfony Standard Edition\" distribution", 
    "autoload": { 
     "psr-0": { "": "src/" } 
    }, 
    "require": { 
     "php": ">=5.3.3", 
     "symfony/symfony": "2.1.*", 
     "doctrine/orm": ">=2.2.3,<2.4-dev", 
     "doctrine/doctrine-bundle": "1.0.*", 
     "twig/extensions": "1.0.*", 
     "symfony/assetic-bundle": "2.1.*", 
     "symfony/swiftmailer-bundle": "2.1.*", 
     "symfony/monolog-bundle": "2.1.*", 
     "sensio/distribution-bundle": "2.1.*", 
     "sensio/framework-extra-bundle": "2.1.*", 
     "sensio/generator-bundle": "2.1.*", 
     "jms/security-extra-bundle": "1.2.*", 
     "jms/di-extra-bundle": "1.1.*" 
    }, 
    "scripts": { 
     "post-install-cmd": [ 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile" 
     ], 
     "post-update-cmd": [ 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile" 
     ] 
    }, 
    "minimum-stability": "dev", 
    "extra": { 
     "symfony-app-dir": "app", 
     "symfony-web-dir": "web" 
    } 
} 

后，我运行脚本;我得到这个：

{"name":"symfony\/framework-standard-edition","description":"The \"Symfony Standard Edition\" distribution","autoload":{"psr-0":{"_empty_":"src\/"}},"require":{"php":">=5.3.3","symfony\/symfony":"2.1.*","doctrine\/orm":">=2.2.3,<2.4-dev","doctrine\/doctrine-bundle":"1.0.*","twig\/extensions":"1.0.*","symfony\/assetic-bundle":"2.1.*","symfony\/swiftmailer-bundle":"2.1.*","symfony\/monolog-bundle":"2.1.*","sensio\/distribution-bundle":"2.1.*","sensio\/framework-extra-bundle":"2.1.*","sensio\/generator-bundle":"2.1.*","jms\/security-extra-bundle":"1.2.*","jms\/di-extra-bundle":"1.1.*","friendsofsymfony\/user-bundle":"*"},"scripts":{"post-install-cmd":["Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap","Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache","Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets","Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"],"post-update-cmd":["Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap","Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache","Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets","Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"]},"minimum-stability":"dev","extra":{"symfony-app-dir":"app","symfony-web-dir":"web"}} 

所有换行等都丢失了。

我的PHP版本是5.3.10，这意味着我不能使用PHP 5.4，其具有编码“PRETTY_PRINT”选项。

有没有办法（让我的文件结构在PHP 5.3.10使用json_encode）;?

Answer 1

使用print_r：

$pretty_json = print_r(json_decode($arr, true), true); 

意识到，正是你需要的JSON文件，检查this function

Answer 2

遗憾的是没有。

由于数据是用于机消费这不应该是一个主要的问题 - 如果你要目视检查它，有一些工具，你会根据上下文自动做漂亮的印刷。

Answer 3

为什么是格式重要？当然，这意味着要消耗一个程序/过程，消除对人类可读性的需求？

我有一个方便的谷歌Chrome扩展查看JSON提要：

https://chrome.google.com/webstore/detail/json-formatter/bcjindcccaagfpapjjmafapmmgkkhgoa

Answer 4

用于通过丹尼斯Ermolin提供的function，并添加str_replace（）函数：

<?php 

$filename = 'composer.json'; 
$obj = json_decode(file_get_contents($filename, true)); 

if (null === $obj) { 
    throw new Exception(json_last_error()); // this will just be an error code 
} 

$obj->require = (object) array_merge((array) $obj->require, array('friendsofsymfony/user-bundle' => "*")); 

file_put_contents($filename,pretty_json(json_encode($obj))); 

function pretty_json($json) { 
    $result  = ''; 
    $pos   = 0; 
    $strLen  = strlen($json); 
    $indentStr = ' '; 
    $newLine  = "\n"; 
    $prevChar = ''; 
    $outOfQuotes = true; 
    for ($i=0; $i<=$strLen; $i++) { 
     // Grab the next character in the string. 
     $char = substr($json, $i, 1); 
     // Are we inside a quoted string? 
     if ($char == '"' && $prevChar != '\\') { 
      $outOfQuotes = !$outOfQuotes; 
     // If this character is the end of an element, 
     // output a new line and indent the next line. 
     } else if(($char == '}' || $char == ']') && $outOfQuotes) { 
      $result .= $newLine; 
      $pos --; 
      for ($j=0; $j<$pos; $j++) { 
       $result .= $indentStr; 
      } 
     } 
     // Add the character to the result string. 
     $result .= $char; 
     // If the last character was the beginning of an element, 
     // output a new line and indent the next line. 
     if (($char == ',' || $char == '{' || $char == '[') && $outOfQuotes) { 
      $result .= $newLine; 
      if ($char == '{' || $char == '[') { 
       $pos ++; 
      } 
      for ($j = 0; $j < $pos; $j++) { 
       $result .= $indentStr; 
      } 
     } 
     $prevChar = $char; 
    } 
    $result = str_replace("\\/", "/", $result); 
    return $result; 
} 
?> 

或者只是更新到PHP 5.4使用PRETTY_PRINT ...