php 输出格式化json字符

代码

<?php
function jsonFormat($json){
    // 缩进处理
    $ret = '';
    $pos = 0;
    $length = strlen($json);
    $indent = isset($indent)? $indent : '    ';
    $newline = "\n";
    $prevchar = '';
    $outofquotes = true;
    for($i=0; $i<=$length; $i++){
        $char = substr($json, $i, 1);
        if($char=='"' && $prevchar!='\\'){
            $outofquotes = !$outofquotes;
        }
        else if(($char=='}' || $char==']') && $outofquotes){
            $ret .= $newline;
            $pos --;
            for($j=0; $j<$pos; $j++){
                $ret .= $indent;
            }
        }
        $ret .= $char;
        if(($char==',' || $char=='{' || $char=='[') && $outofquotes){
            $ret .= $newline;
            if($char=='{' || $char=='['){
                $pos ++;
            }

            for($j=0; $j<$pos; $j++){
                $ret .= $indent;
            }
        }
        $prevchar = $char;
    }
    return $ret;
}

echo jsonFormat(json_encode($data));