/**
* 格式化输出json数据
* @param $json 待输出数据
* @return json格式化后的数据
*/
function prettyPrint($json) {
$result = '';
$level = 0;
$prev_char = '';
$in_quotes = false;
$ends_line_level = NULL;
$json_length = strlen($json);

for ($i = 0; $i < $json_length; $i++) {
$char = $json[$i];
$new_line_level = NULL;
$post = "";
if ($ends_line_level !== NULL) {
$new_line_level = $ends_line_level;
$ends_line_level = NULL;
}
if ($char === '"' && $prev_char != '\\') {
$in_quotes = !$in_quotes;
} else if (!$in_quotes) {
switch ($char) {
case '}': case ']':
$level--;
$ends_line_level = NULL;
$new_line_level = $level;
break;

case '{': case '[':
$level++;
case ',':
$ends_line_level = $level;
break;

case ':':
$post = " ";
break;

case " ": case "\t": case "\n": case "\r":
$char = "";
$ends_line_level = $new_line_level;
$new_line_level = NULL;
break;
}
}
if ($new_line_level !== NULL) {
$result .= "\n" . str_repeat(" ", $new_line_level);
}
$result .= $char . $post;
$prev_char = $char;
}

return $result;
}

/**
* 格式化输出json数据
* @param $json 待输出数据
* @return json格式化后的数据
*/
function indent($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;
}

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