What to do if thinkphp5.1 array json error is reported

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.

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 {
    // 对应键不存在的处理
}

2. 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格式不正确的处理
}

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.

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