ThinkPHP 5.1 is a very excellent PHP framework, in which arrays and JSON are common data types. However, when using them, you sometimes encounter problems. This article will introduce how to solve errors when using arrays and JSON in ThinkPHP 5.1.
- Array error
When using an array, you sometimes encounter the following error:
Notice:?Undefined?index:?xxx?in?/xx/xx/xx.php?on?line?x
This error means that no defined key in the array is referenced . The solution is to use the isset() function to check whether the key exists before accessing the array element.
if?(isset($array['xxx']))?{ ????$value?=?$array['xxx']; }?else?{ ????//?對(duì)應(yīng)鍵不存在的處理 }
- JSON error
When using JSON, sometimes you will encounter the following error:
json_decode():?json?does?not?contain?valid?JSON?format...
This error means that the JSON format is incorrect and cannot be decoding. The solution is to check whether the value returned by json_decode() is NULL when using it.
$json?=?'{"key":?"value}'; $data?=?json_decode($json); if?($data?===?null?&&?json_last_error()?!==?JSON_ERROR_NONE)?{ ????//?JSON格式不正確的處理 }
In addition, when using JSON, you need to pay attention to character encoding issues. If there are special characters (such as Chinese) in the JSON, you can use the mb_convert_encoding() function to convert it to UTF-8 encoding.
$json?=?'{"key":?"中文字符"}'; $json?=?mb_convert_encoding($json,?'UTF-8'); $data?=?json_decode($json);
In short, when using arrays and JSON, you need to pay attention to the validity and correctness of the data. If an error occurs, the problem can be solved by inspecting and transforming the data.
The above is the detailed content of What to do if thinkphp5.1 array json error is reported. For more information, please follow other related articles on the PHP Chinese website!

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