- memory_get_usage: documentation ( source)
<?php
$start = new DateTime('2018-12-31 00:00:00');
$end = new DateTime('2021-12-31 00:00:00');
$interval = new DateInterval('P1M');
$recurrences = 5;
$elements = [];
for ($i = 0; $i < 25000; $i++) {
$elements[] = new DatePeriod($start, $interval, $recurrences, DatePeriod::EXCLUDE_START_DATE);
}
echo "Memory usage: " . memory_get_usage(true) / (1024 * 1024) . " MB\n";