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PHP 5.2.17p1 (cli) (built: May 28 2015 16:15:30)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2010 Zend Technologies
<?php $s = json_encode(array("cost" => "199000000000&444838oo88888ooooo38338384&132132121321&"));
var_dump(isset($s[‘ecode_cost_detail‘]));
$s = array(1);
var_dump(isset($s[‘ecode_cost_detail‘]));
$s = "";
var_dump(isset($s[‘ecode_cost_detail‘]));
$s = null;
var_dump(isset($s[‘ecode_cost_detail‘]));
$s = "mmmmm";
var_dump(isset($s[‘ecode_cost_detail‘]));
返回结果
bool(true)
bool(false)
bool(false)
bool(false)
bool(true)
对于5.6版本
返回结果
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
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原文地址：http://www.cnblogs.com/yimuren/p/5413471.html
