oneall_pretty_json.php

<?php

/**
 * Copyright 2017 - Present OneAll, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 */

// Return a nicely formatted JSON string
class oneall_pretty_json
{
    public static function format_string($json, $stripslashes = true)
    {
        $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;
            }
            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;
        }

        // Done
        return ($stripslashes ? stripslashes($result) : $result);
    }
}