PHP triggered execution of the task, how to handle

PHP-Triggered execution of tasks
The problem is this.
How can I get PHP in a month, the first person to visit the site, to execute a specific code, then the person will not visit the line,
Until next month, the first person to visit executes a specific code.

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------Solution--------------------
As long as the number of users per month 1th, the guest record is written to the data table, judging is not the case.
------Solution--------------------

$FN = ' no_start.txt ';

------Solution--------------------
Date (' d ', Filemtime ($FN))! = 1) {
  Echo ' executes a specific code ';
  File_put_contents ($FN, ");
}

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