0 = JSON_ERROR_NONE No error has occurred
1 = JSON_ERROR_DEPTH The maximum stack depth has been exceeded
2 = JSON_ERROR_STATE_MISMATCH Invalid or malformed JSON
3 = JSON_ERROR_CTRL_CHAR Control character error, possibly incorrectly encoded
4 = JSON_ERROR_SYNTAX Syntax error
5 = JSON_ERROR_UTF8 Malformed UTF-8 characters, possibly incorrectly encoded PHP 5.3.3
2:编码问题
默认JSON字符串是UTF-8格式 如果是其他格式可能出错
$output = iconv('gbk', 'utf8', $output);
3:未知原因 可能是BOM问题
json_decode(substr($str, 3), true);
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