Validating Crontab Entries with PHP

Question

What is the best way to validate a crontab entry with PHP? Should I be using a regex, or an external library? I\'ve got a PHP script that adds/removes entries from a crontab

Answer 1

There is a nice PHP library that can be used for Cron expression validation:

• https://github.com/mtdowling/cron-expression

To install this library via composer:

composer require mtdowling/cron-expression

To check if Cron expression is valid

$isValid = Cron\CronExpression::isValidExpression($expression);