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--TEST--
DatePeriod modify readonly property
--FILE--
<?php
$dp = new \DatePeriod(
new \DateTimeImmutable("2023-01-13"),
DateInterval::createFromDateString('+1 month'),
new \DateTimeImmutable("2023-12-31"),
);
try {
$dp->interval = "foo";
} catch( \Error $e ) {
echo $e::class, ': ', $e->getMessage(), "\n";
}
try {
$foo =& $dp->interval;
} catch( \Error $e ) {
echo $e::class, ': ', $e->getMessage(), "\n";
}
?>
--EXPECTF--
Error: Cannot modify readonly property DatePeriod::$interval
Error: Cannot modify readonly property DatePeriod::$interval
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