The Ds\Sequence::shift() function is an inbuilt function in PHP which is used to removes the first element from the sequence and return it.
Syntax:
mixed abstract public Ds\Sequence::shift ( void )
Parameters: This function does not accepts any parameter.
Return values: This function returns the first value which is removed from the sequence.
Below programs illustrate the Ds\Sequence::shift() function in PHP:
Program 1:
<?php    // Create new sequence $seq = new \Ds\Vector([9, 10, 15, 20]);   // Use shift() function to remove // first element from sequence var_dump($seq->shift());   var_dump($seq->shift());   var_dump($seq->shift());   var_dump($seq->shift());   ?> |
Output:
int(9) int(10) int(15) int(20)
Program 2:
<?php    // Create new sequence $seq = new \Ds\Vector(["Geeks", "for", "Geeks"]);   // Use shift() function to remove // first element from sequence var_dump($seq->shift());   var_dump($seq->shift());   var_dump($seq->shift());   ?> |
Output:
string(5) "Geeks" string(3) "for" string(5) "Geeks"
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