1<?php
 2$json_array = array();
 3
 4// 1。转换为json字符串（不自动转换为unicode编码）
 5if (version_compare(PHP_VERSION,'5.4.0','<'))
 6	$json_string = preg_replace_callback("#\\\u([0-9a-f]{4})#i", function($matchs){return iconv('UCS-2BE','UTF-8',pack('H4', $matchs[1]));}, json_encode($json_array));
 7else
 8	$json_string = json_encode($json_array, JSON_UNESCAPED_UNICODE);
 9
10// 2。现在$json_string是gbk编码，转换为utf8
11$json_string = iconv('GB2312', 'UTF-8', $tables);
12
13// 3。输出到文件
14file_put_contents('./json_string.json', $json_string);

 1/**
 2 * 重新调整json缩进
 3 * @Author   zjf
 4 * @DateTime 2017-03-10
 5 * @param    String     $json json字符串
 6 * @return   String     处理后的json字符串
 7 */
 8function reindent_json($json){
 9	preg_match_all('/\{|\}|,/',$json,$matches);
10	$tab = 0;
11	$eol = PHP_EOL;
12	foreach ($matches[0] as $key => $value) {
13		if ($value == '{') {
14			$json = preg_replace('/\{(?!'.$eol.')/', "{".$eol.str_repeat("\t", ++$tab), $json, 1);
15		}elseif ($value == '}') {
16			$json = preg_replace('/([^\t])\}/', "$1".$eol.str_repeat("\t", --$tab)."}", $json, 1);
17		}elseif ($value == ',') {
18			$json = preg_replace('/,(?!'.$eol.')/', ",".$eol.str_repeat("\t", $tab), $json, 1);
19		}
20	}
21	return $json;
22}