The Ds\Vector::shift() function is an inbuilt function in PHP which is used to remove the first element from the vector and return it.
Syntax:
mixed public Ds\Vector::shift( void )
Parameters: This function does not accept any parameter.
Return Value: This function returns the value at index 0.
Exception: This function throws UnderflowException if vector is empty.
Below programs illustrate the Ds\Vector::shift() function in PHP:
Program 1:
<?php   // Declare an Vector $vect = new \Ds\Vector(["neveropen", "of", "neveropen"]);   echo("First element in the vector:\n");   // Use shift() function to remove first // element from vector and display it var_dump($vect->shift());   ?> |
Output:
First element in the vector: string(5) "neveropen"
Program 2:
<?php   // Declare an Vector $vect = new \Ds\Vector([1, 2, 3, 4, 5, 6]);   // Use shift() function to remove first // element from vector and display it var_dump($vect->shift());   var_dump($vect->shift());   var_dump($vect->shift());   var_dump($vect->shift());   ?> |
Output:
int(1) int(2) int(3) int(4)
Reference: http://php.net/manual/en/ds-vector.shift.php
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