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run code in 150+ php & hhvm versions
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<?php $pq = new SplPriorityQueue(); //insert method inserts an element in the queue by shifting it up $pq->insert('A', 3); $pq->insert('B', 6); $pq->insert('C', -1); $pq->insert('D', 2); //count the elements echo "count ->" . $pq->count(); //Sets the mode of extraction (EXTR_DATA, EXTR_PRIORITY, EXTR_BOTH) $pq->setExtractFlags(SplPriorityQueue::EXTR_BOTH); //go at the node from the top of the queue $pq->top(); //iterate the queue (by priority) and display each element while ($pq->valid()) { print_r($pq->current()); $pq->next(); } $pq->top(); //iterate the queue (by priority) and display each element while ($pq->valid()) { print_r($pq->current()); $pq->next(); }
based on 85Xk4
Output for 7.0.0 - 7.1.0
count ->4Array ( [data] => B [priority] => 6 ) Array ( [data] => A [priority] => 3 ) Array ( [data] => D [priority] => 2 ) Array ( [data] => C [priority] => -1 ) Fatal error: Uncaught RuntimeException: Can't peek at an empty heap in /in/WaUn8:26 Stack trace: #0 /in/WaUn8(26): SplPriorityQueue->top() #1 {main} thrown in /in/WaUn8 on line 26
Process exited with code 255.
Output for hhvm-3.12.0
count ->4Array ( [data] => B [priority] => 6 ) Array ( [data] => A [priority] => 3 ) Array ( [data] => D [priority] => 2 ) Array ( [data] => C [priority] => -1 ) Fatal error: Uncaught exception 'RuntimeException' with message 'Can't peek at an empty heap' in /in/WaUn8:26 Stack trace: #0 /in/WaUn8(26): SplPriorityQueue->top() #1 {main}
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.6.28
count ->4Array ( [data] => B [priority] => 6 ) Array ( [data] => A [priority] => 3 ) Array ( [data] => D [priority] => 2 ) Array ( [data] => C [priority] => -1 ) Fatal error: Uncaught exception 'RuntimeException' with message 'Can't peek at an empty heap' in /in/WaUn8:26 Stack trace: #0 /in/WaUn8(26): SplPriorityQueue->top() #1 {main} thrown in /in/WaUn8 on line 26
Process exited with code 255.
Output for 5.0.0 - 5.2.17
Fatal error: Class 'SplPriorityQueue' not found in /in/WaUn8 on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected ')', expecting '(' in /in/WaUn8 on line 15
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected ')', expecting '(' in /in/WaUn8 on line 15
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'('' in /in/WaUn8 on line 15
Process exited with code 255.