The Ds\PriorityQueue::peek() Function in PHP is used to get the value present at the front of a PriorityQueue.
Syntax:
mixed public Ds\PriorityQueue::peek ( void )
Parameters: This function does not accepts any parameters.
Return Value: This function returns the value present at the front of this PriorityQueue. The return type of the function is mixed and depends on the type of value stored in the PriorityQueue.
Exception: This function throws an UnderflowException if the PriorityQueue is empty.
Below programs illustrate the Ds\PriorityQueue::peek():
Program 1:
<?php // Declare new PriorityQueue $pq = new \Ds\PriorityQueue(); // Add elements to the PriorityQueue $pq->push("One", 1); $pq->push("Two", 2); $pq->push("Three", 3); echo "PriorityQueue is: \n"; print_r($pq); // Get element at the front echo "\nElement at front is: "; print_r($pq->peek()); ?> |
PriorityQueue is:
Ds\PriorityQueue Object
(
[0] => Three
[1] => Two
[2] => One
)
Element at front is: Three
Program 2:
<?php // Declare new PriorityQueue $pq = new \Ds\PriorityQueue(); echo "PriorityQueue is: \n"; print_r($pq); // Get element at the front echo "\nElement at front is: "; print_r($pq->peek()); ?> |
PHP Fatal error: Uncaught UnderflowException
Reference: http://php.net/manual/en/ds-priorityqueue.peek.php
Recommended Posts:
- PHP | Ds\Stack peek() Function
- PHP Ds\Queue peek() Function
- How to get the function name inside a function in PHP ?
- PHP 5 vs PHP 7
- PHP | Get PHP configuration information using phpinfo()
- PHP | php.ini File Configuration
- How to import config.php file in a PHP script ?
- PHP | imagecreatetruecolor() Function
- PHP | fpassthru( ) Function
- PHP | ImagickDraw getTextAlignment() Function
- PHP | Ds\Sequence last() Function
- PHP | Imagick floodFillPaintImage() Function
- Function to escape regex patterns before applied in PHP
- PHP | array_udiff_uassoc() Function
- PHP | geoip_continent_code_by_name() Function
- PHP | GmagickPixel setcolor() function
- PHP | opendir() Function
- PHP | cal_to_jd() Function
- PHP | stream_get_transports() Function
- PHP | Ds\Deque pop() Function
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.
