PHP uses backticks to execute external commands, php executes external commands_PHP tutorial

PHP uses backticks to execute external commands, php executes external commands

For example:

echo `whoami`;

// Export the database, the folder to be imported must have writable permissions, and the content after -u -p must be written immediately

Copy code The code is as follows: echo `mysqldump -h localhost -u$DbUser -p$DbPwd --default-character-set=utf8 $DbName > /var/$dumpFileName`;

Other uses of backticks

<&#63;php  
  #使用反撇号，暗示作为命令来执行
  $result=`date`;
  echo "<p>the server timestamp is: $result</p>";

  echo "<hr color=red>";
  #使用shell_exec()
  $result1=shell_exec("date");
  echo "<p>the server timestamp is: $result1</p>";
&#63;>

The output results are as follows:
the server timestamp is: Current date: 2009/06/30 Enter the new date: (year, month, day)

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