如何使用PHP将浏览器输出写入日志文件？

我有Cron jobs运行的脚本。因此，当它运行时，我看不到任务的输出是什么。（错误等。）

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所以我需要使用PHP将浏览器输出写入日志文件。如何执行此操作？

您可以使用“php yourfile.php>logfile.log”在cron指令中重定向php脚本的输出，也可以使用php将其保存到任何调用print的文件中。

您可以使用它将浏览器输出写入日志文件

$file = fopen("log.txt", "a");
fwrite ($file, $some_data); 

例如：

<?php
ob_start();

echo 'Lorem ipsum dolor sit amet consectetur adipiscing elit';
echo 'Cras in dolor fringilla est fermentum porttito';
echo 'bla bla bla...';
echo 'bla bla bla...';

file_put_contents('/path/to/log.txt',ob_get_contents());
ob_end_flush();
?>

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我更喜欢使用bash功能进行输出重定向：

php myscript.php > logfile.log

但是您需要知道PHP会将错误输出到

stderr

。因此，您也需要重定向

stderr

。这里描述了所有内容：。本页中的一些示例：

php myscript.php &>file

或

此外，您不能单独使用like

ob_start（）

和friends，因为某些致命错误可能会中止输出缓冲。因此，如果您更喜欢PHP唯一方式，则需要定义：

输出缓冲

错误处理程序（或者您可以使用输出缓冲获取错误）

Shutdown函数-获取致命错误

---

另外，通常情况下，cron作业的输出会写入crontab的日志

我将此脚本用于错误日志：

// Destinations
define("ADMIN_EMAIL", "nobody@stanford.edu");
define("LOG_FILE", "/my/home/errors.log");
 
// Destination types
define("DEST_EMAIL", "1");
define("DEST_LOGFILE", "3");
 
/**
  * my_error_handler($errno, $errstr, $errfile, $errline)
  *
  * Author(s): thanosb, ddonahue
  * Date: May 11, 2008
  * 
  * custom error handler
  *
  * Parameters:
  *  $errno:   Error level
  *  $errstr:  Error message
  *  $errfile: File in which the error was raised
  *  $errline: Line at which the error occurred
  */
 
function my_error_handler($errno, $errstr, $errfile, $errline)
{  
  switch ($errno) {
    case E_USER_ERROR:
      // Send an e-mail to the administrator
      error_log("Error: $errstr \n Fatal error on line $errline in file $errfile \n", DEST_EMAIL, ADMIN_EMAIL);
 
      // Write the error to our log file
      error_log("Error: $errstr \n Fatal error on line $errline in file $errfile \n", DEST_LOGFILE, LOG_FILE);
      break;
 
    case E_USER_WARNING:
      // Write the error to our log file
      error_log("Warning: $errstr \n in $errfile on line $errline \n", DEST_LOGFILE, LOG_FILE);
      break;
 
    case E_USER_NOTICE:
      // Write the error to our log file
      error_log("Notice: $errstr \n in $errfile on line $errline \n", DEST_LOGFILE, LOG_FILE);
      break;
 
    default:
      // Write the error to our log file
      error_log("Unknown error [#$errno]: $errstr \n in $errfile on line $errline \n", DEST_LOGFILE, LOG_FILE);
      break;
  }
 
  // Don't execute PHP's internal error handler
  return TRUE;
}
 
 
// Use set_error_handler() to tell PHP to use our method
$old_error_handler = set_error_handler("my_error_handler");

它可以完全控制在出现错误时要采取的操作
直接取自

// Destinations
define("ADMIN_EMAIL", "nobody@stanford.edu");
define("LOG_FILE", "/my/home/errors.log");
 
// Destination types
define("DEST_EMAIL", "1");
define("DEST_LOGFILE", "3");
 
/**
  * my_error_handler($errno, $errstr, $errfile, $errline)
  *
  * Author(s): thanosb, ddonahue
  * Date: May 11, 2008
  * 
  * custom error handler
  *
  * Parameters:
  *  $errno:   Error level
  *  $errstr:  Error message
  *  $errfile: File in which the error was raised
  *  $errline: Line at which the error occurred
  */
 
function my_error_handler($errno, $errstr, $errfile, $errline)
{  
  switch ($errno) {
    case E_USER_ERROR:
      // Send an e-mail to the administrator
      error_log("Error: $errstr \n Fatal error on line $errline in file $errfile \n", DEST_EMAIL, ADMIN_EMAIL);
 
      // Write the error to our log file
      error_log("Error: $errstr \n Fatal error on line $errline in file $errfile \n", DEST_LOGFILE, LOG_FILE);
      break;
 
    case E_USER_WARNING:
      // Write the error to our log file
      error_log("Warning: $errstr \n in $errfile on line $errline \n", DEST_LOGFILE, LOG_FILE);
      break;
 
    case E_USER_NOTICE:
      // Write the error to our log file
      error_log("Notice: $errstr \n in $errfile on line $errline \n", DEST_LOGFILE, LOG_FILE);
      break;
 
    default:
      // Write the error to our log file
      error_log("Unknown error [#$errno]: $errstr \n in $errfile on line $errline \n", DEST_LOGFILE, LOG_FILE);
      break;
  }
 
  // Don't execute PHP's internal error handler
  return TRUE;
}
 
 
// Use set_error_handler() to tell PHP to use our method
$old_error_handler = set_error_handler("my_error_handler");