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Since `DateTimeZone` does not implement a `compare_objects` handler, nor has any properties, two `DateTimeZone` instances always compare as being equal, even if they designate totally different timezones. Even worse, after calling `var_dump()` on these objects, the actual comparison may yield a correct result. We therefore introduce a `compare_objects` handlers, which prevents different behavior before/after `var_dump()`, and which allows us to clearly define the intended semantics.
61 lines
1.2 KiB
PHP
61 lines
1.2 KiB
PHP
--TEST--
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Test of compare object handler for DateTimeZone objects
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--FILE--
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<?php
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$timezones = array(
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['+0200', '-0200'],
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['EST', 'PST'],
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['Europe/Amsterdam', 'Europe/Berlin']
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);
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foreach ($timezones as [$timezone1, $timezone2]) {
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compare_timezones($timezone1, $timezone1);
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compare_timezones($timezone1, $timezone2);
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}
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var_dump(new DateTimeZone('Europe/Berlin') == new DateTimeZone('CET'));
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function compare_timezones($timezone1, $timezone2)
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{
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$tz1 = new DateTimeZone($timezone1);
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$tz2 = new DateTimeZone($timezone2);
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echo "compare $timezone1 with $timezone2\n";
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echo "< ";
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var_dump($tz1 < $tz2);
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echo "= ";
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var_dump($tz1 == $tz2);
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echo "> ";
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var_dump($tz1 > $tz2);
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}
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?>
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--EXPECTF--
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compare +0200 with +0200
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< bool(false)
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= bool(true)
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> bool(false)
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compare +0200 with -0200
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< bool(false)
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= bool(false)
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> bool(false)
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compare EST with EST
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< bool(false)
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= bool(true)
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> bool(false)
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compare EST with PST
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< bool(false)
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= bool(false)
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> bool(false)
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compare Europe/Amsterdam with Europe/Amsterdam
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< bool(false)
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= bool(true)
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> bool(false)
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compare Europe/Amsterdam with Europe/Berlin
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< bool(false)
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= bool(false)
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> bool(false)
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Warning: main(): Trying to compare different kinds of DateTimeZone objects in %s on line %d
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bool(false)
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