How to store array in php log

In PHP development, it is often necessary to record logs for subsequent viewing, analysis and optimization of the code. And when array data needs to be recorded to a log file, how to store it? Several common storage methods will be introduced below.

1. Use the var_export function
var_export is a PHP built-in function that can output PHP variables into legal codes that can be used by the eval() function. Therefore, after using var_export to output the array as a string, it can be stored directly into the log file.

Sample code:

$array = array('apple', 'banana', 'orange');
$log = date('Y-m-d H:i:s') . ' Array Log:' . var_export($array, true) . PHP_EOL;
file_put_contents('log.txt', $log, FILE_APPEND);

The above code stores the array as a string into the log file. Among them, the second parameter of var_export is set to true, which means that the array is returned in the form of a string instead of being output directly.

2. Use the json_encode function
json_encode can convert a PHP array into a JSON string. JSON is a lightweight data exchange format that is easy to read, write, parse, and cross-language. and other advantages. Therefore, storing array data as a JSON string in a log file is also a good choice.

Sample code:

$array = array('apple', 'banana', 'orange');
$log = date('Y-m-d H:i:s') . ' JSON Log:' . json_encode($array) . PHP_EOL;
file_put_contents('log.txt', $log, FILE_APPEND);

To store the array in JSON form in the log file, you can use the json_encode function. The JSON management constant JSON_UNESCAPED_UNICODE in the parameter means not to escape Chinese characters so that they can be used in Keep the new format displayed in the browser or other program.

3. Use the serialize function
serialize is a function that serializes PHP variables into strings. By using the serialize function on an array, the array data can be converted into a string and stored in the log file.

Sample code:

$array = array('apple', 'banana', 'orange');
$log = date('Y-m-d H:i:s') . ' Serialized Log:' . serialize($array) . PHP_EOL;
file_put_contents('log.txt', $log, FILE_APPEND);

To store the array in a serialized form in the log file, just use the serialize function.

Summary:
The above three methods can store array data in log files. The specific selection method can be selected according to actual needs. It should be noted that when using the var_export and serialize functions, you need to consider the issue of deserialization, and when using json_encode, you need to consider the issue of escaping characters. No matter which method is used, the data needs to be parsed at the appropriate time for continued use in the code.

The above is the detailed content of How to store array in php log. For more information, please follow other related articles on the PHP Chinese website!