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I have a PHP script which performs a SQL query. This works well, the data, formatted as a table, show up.
Then I want to parse a cron expression, to find out when the last three executions of a specific cronjob were planned.

This is the code:

for($i = 0; $i <= 2; $i ++)

 $date = $return[$i]->cronexpression;
 var_dump($date);
 $cron = CronCronExpression::factory($date);
 $cron->isDue();
 $real_date = $cron->getPreviousRunDate(null, $i)->format('Y-m-d H:i:s');
 $return[$i]->cronexpression = $real_date;

The manual for the parser can be found here: https://packagist.org/packages/dragonmantank/cron-expression .

When I add the for-loop and this bit of code:

require_once '/vendor/autoload.php';

the table doesn't show up, an empty page is displayed. The var_dump is not shown in the console. How can I make this work?
Thanks!

Edit:

I found the error.log. It had two messages:

First: [php7:warn] [pid 4916:tid 1544] [client 127.0.0.1:54056] PHP Warning: require_once(/vendor/autoload.php): failed to open stream: No such file or directory in C:xampphtdocscronjob-overviewapiget_cronjob.php on line 7, referer: http://localhost:8080/overview

Second: [php7:error] [pid 4916:tid 1544] [client 127.0.0.1:54056] PHP Fatal error: require_once(): Failed opening required '/vendor/autoload.php' (include_path='C:xamppphpPEAR') in C:xampphtdocscronjob-overviewapiget_cronjob.php on line 7, referer: http://localhost:8080/overview

Line 7 is this: require_once '../vendor/autoload.php';

I checked the vendor folder´, the autoload.php is there. I am puzzled, what else could be the reason?