Example of PHP Custom Function Formatting JSON Data

This example explains how to format JSON data with a custom PHP function. Share it with everyone for reference, as follows:

<?php
  /**
   * Formats a JSON string for pretty printing
   *
   * @param string $json The JSON to make pretty
   * @param bool $html Insert nonbreaking spaces and <br />s for tabs and linebreaks
   * @return string The prettified output
   */
$arr = array("ret"=>0,"data"=>array('a' => 1, 'b' => "Yell Tutorial", 'c' => 3, 'd' => 4, 'e' => 5));
$json = json_encode($arr);
function _format_json($json, $html = false) {
    $tabcount = 0;
    $result = '';
    $inquote = false;
    $ignorenext = false;
    if ($html) {
      $tab = "   ";
      $newline = "<br/>";
    } else {
      $tab = "\t";
      $newline = "\n";
    }
    for($i = 0; $i < strlen($json); $i++) {
      $char = $json[$i];
      if ($ignorenext) {
        $result .= $char;
        $ignorenext = false;
      } else {
        switch($char) {
          case '{':
            $tabcount++;
            $result .= $char . $newline . str_repeat($tab, $tabcount);
            break;
          case '}':
            $tabcount--;
            $result = trim($result) . $newline . str_repeat($tab, $tabcount) . $char;
            break;
          case ',':
            $result .= $char . $newline . str_repeat($tab, $tabcount);
            break;
          case '"':
            $inquote = !$inquote;
            $result .= $char;
            break;
          case '\\':
            if ($inquote) $ignorenext = true;
            $result .= $char;
            break;
          default:
            $result .= $char;
        }
      }
    }
    return $result;
  }
echo _format_json($json);
/*
{
  "ret": 0,
  "data": {
    "a": 1,
    "b": "\u811a\u672c\u4e4b\u5bb6"
    "c": 3,
    "d": 4,
    "e": 5
  }
}
**/
?>

PS: Here are some practical json online tools for your reference and use:

Online JSON code verification, verification, beautification, and formatting tool:
http://tools.jb51.net/code/json

Online JSON formatting tool:
http://tools.jb51.net/code/jsonformat

Online XML/JSON conversion tool:
http://tools.jb51.net/code/xmljson

Online JSON code formatting/Beautify/Compress/Edit/Conversion tool:
http://tools.jb51.net/code/jsoncodeformat

C language style/HTML/CSS/JSON code formatting and beautification tool:
http://tools.jb51.net/code/ccode_html_css_json

More about PHP-related content, readers who are interested can check the special topic of this site: 'PHP json format data operation skills summary', 'PHP XML file operation skills summary', 'PHP basic syntax tutorial', 'PHP array (Array) operation skills大全', 'PHP string (string) usage summary', 'php+MySQL Database Operation Tutorial and PHP Common Database Operation Skills Summary

I hope the content described in this article will be helpful to everyone's PHP program design.

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