<?php
/**
* Indents a flat JSON string to make it more human-readable
*
* @param string $json The original JSON string to process
* @return string Indented version of the original JSON string
*
* Source: Pranav Tekchand, http://recursive-design.com/blog/2008/03/11/format-json-with-php/#comment-92993539
*/
function json_indent($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;
	}

	return $result;
}
?>