php实现json编码的方法

<?php
/*
 * json
 */
$books = array('key1'=>'value1','key2'=>'value2','key3'=>array('key4'=>'value4','key5'=>'value5'));
$json = json_encode($books);
$rejson = json_decode($json,true);
echo '原数组：<br/>';
print_r($books);
echo '<br/><br/>';
echo '经json编码后：<br/>';
print $json."<br/>";
echo '<br/>';
echo '经json解码后：<br/>';
print_r($rejson);
echo '<br/><br/>';
//实例
$jsonn = '{"error_code":"400","request":"\/Router\/aQConnectError","api_code":40006,"error":"\u4f20\u5165\u7684\u63a5\u53e3\u53c2\u6570\u51fa\u9519\uff0c\u53c2\u6570openid\u672a\u8bbe\u5b9a\u3002"}';
print_r(json_decode($jsonn));
?>