In php how to execute certain function after past X days of last execution

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In php how to execute certain function after past X days of last execution

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#1 by (6 votes)
#2 by (4 votes)

1

I'm developing changes and routines in a web application created in PHP and CakePHP, in case one of the routines would be a Component run every 15 days, to update an .html file As in PHP, do I check if X has been past days of the last execution of a given routine?

I thought of the following algorithm, but it is the 'smart' way to do the verification, how to code the algorithm?

1- Take the recorded milliseconds into a text file. 2- get the current milliseconds. 3- If you have nothing in the text file, or the current milliseconds are greater than or equal to, the milliseconds recorded in the file plus the value of X days in milliseconds. 4- record the current milliseconds in the text file.

php datetime cakephp-2

asked by anonymous 01.08.2014 / 14:49

2 answers

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score 6 · Answer 1

A possibility would be something like having at least the location of the files and the information returned by filemtime () of each of them stored in a database.

Accessed by a given URL, you would see this information, and preferably DateTime , you would compare if 15 days passed and if so, it would execute its routine on the files.

This approach has at least three problems:

Requires someone to manually access this URL

If there are too many files, the routine will be overloaded, especially in the loop

2.1 You could have timeout problems because of this

To solve the first problem and suddenly the other two at the same time, you would associate this with a CronJob configured to run every 15 days.

But think to me: If a given routine should occur every 15 days, why keep a list of files, timestamps of the modification date, loops, comparisons, and so on. if you simply create a routine that affects every file every 15 days?

Answer this question and you will find that with CronJobs you solve everything with your feet on your back. ;)

score 4 · Answer 2

I see no problem using a common date for this calculation if you do not need this millisecond accuracy.

My idea would be to use the DateTime class to check the difference of 15 days

<?php

// Algum metodo de alguma classe
function getUltimaExecucao(){

    // Formato Y-m-d
    //$data = getLastDate();

    $data = '2014-06-30';

    return DateTime::createFromFormat('Y-m-d', $data);;
}

// Execução

$dataUltimaExecucao = getUltimaExecucao();
$dataAtual = new DateTime();

$diferenca = $dataAtual->diff($dataUltimaExecucao);
$diferencaEmDias = $diferenca->format('%a');

if ($diferencaEmDias >= 15 ){
    echo "Se passaram $diferencaEmDias dias" . PHP_EOL;
};

echo "FIM";

As commented on in other answers, you might want to run this function in cronjob in environment * unix, or schtasks (cmd) / New-JobTrigger (Powershell) in Windows environments.