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<?php namespace Test; class SegmentCollection { private $segmentArray = []; public function __construct(array $segmentArray) { $this->segmentArray = $segmentArray; } public function popSegment() { return array_pop($this->segmentArray); } public function shiftSegment() { return array_shift($this->segmentArray); } } interface SegmentReader { public function getNextSegment(); } abstract class SegmentReaderBase implements SegmentReader { protected $segmentCollection; public function __construct(SegmentCollection $segmentCollection) { $this->segmentCollection = $segmentCollection; } } class PopSegmentReader extends SegmentReaderBase { public function getNextSegment() { return $this->segmentCollection->popSegment(); } } class ShiftSegmentReader extends SegmentReaderBase { public function getNextSegment() { return $this->segmentCollection->shiftSegment(); } } function acceptSegmentReader(SegmentReader $segmentReader) { var_dump($segmentReader->getNextSegment()); var_dump($segmentReader->getNextSegment()); } $segmentCollection = new SegmentCollection(['foo', 'bar', 'qux', 'zip']); acceptSegmentReader(new PopSegmentReader($segmentCollection)); acceptSegmentReader(new ShiftSegmentReader($segmentCollection));
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(3) "zip" string(3) "qux" string(3) "foo" string(3) "bar"
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/AQ2WT on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/AQ2WT on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/AQ2WT on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/AQ2WT on line 3
Process exited with code 255.