The Ds\Vector::first() function is an inbuilt function in PHP which is used to find the first element in the vector.
Syntax:
mixed public Ds\Vector::first( void )
Parameters: This function does not accept any parameter.
Return Value: This function returns the first element present in the vector.
Below programs illustrate the Ds\Vector::first() function in PHP:
Program 1:
<?php   // Create vector elements $vector = new \Ds\Vector([1, 2, 3, 4, 5]);     echo("First element of the vector: ");   // Use first() function to find // the first element var_dump($vector->first());   ?> |
Output:
First element of the vector: int(1)
Program 2:
<?php   // Create vector elements $vector = new \Ds\Vector(["neveropen", "for", "neveropen"]);     echo("First element of the vector: ");   // Use first() function to find // the first element var_dump($vector->first());   ?> |
Output:
First element of the vector: string(5) "neveropen"
Reference: http://php.net/manual/en/ds-vector.first.php
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