How to set log output in php

php method to set log output: use php's write file function to write data to a predefined file, the code is [file_put_contents(file,data,mode,context)].

php method to set log output:

Idea: Use php where you want to output logs The write file function writes data to a predefined file.

php code is as follows:

//输出日志
    public function outputLog() {
        logOutput(time());
        sleep(3);
        $arr = array("k1" => "v1", "k2" => "v2");
        logOutput($arr);
        $this->display();
    }
logOutput()函数：
/**
 * @param  string,array  $data 需要输出到日志中的数据
 * @return null 
 */
function logOutput($data) {
    //数据类型检测
    if (is_array($data)) {
        $data = json_encode($data);
    }
    $filename = "./log/".date("Y-m-d").".log";
    $str = date("Y-m-d H:i:s")."   $data"."\n";
    file_put_contents($filename, $str, FILE_APPEND|LOCK_EX);
    return null;
}

file_put_contents() function writes a string into a file.

The function is the same as calling fopen(), fwrite() and fclose() in sequence.

Syntax

file_put_contents(file,data,mode,context)

Parameter Description

• file Required. Specifies the file to which data is to be written. If the file does not exist, a new file is created.

• data Optional. Specifies the data to be written to the file. Can be a string, array, or data stream.

• mode Optional. Specifies how to open/write the file. Possible values:

  FILE_USE_INCLUDE_PATH

  FILE_APPEND Append data instead of overwriting

  LOCK_EX When writing data, lock the file to prevent others from changing the file

• context Optional. Specifies the environment for a file handle. (Don’t know what to use)

  Context is a set of options that can modify the behavior of the stream. If null is used, it is ignored.

Meaning:

• When debugging where something may go wrong, output the error message

• Output variables for debugging, which can avoid the usual var_dump and dump functions from printing a long string of data and affecting the page layout

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