The Ds\Sequence::first() function is an inbuilt function in PHP which is used to return the first element from the sequence.
Syntax:
mixed abstract public Ds\Sequence::first ( void )
Parameter: This function does not accepts any parameter.
Return value: This function returns the first element from the sequence.
Below programs illustrate the Ds\Sequence::first() function in PHP:
Example 1:
<?php   // Create new sequence $seq = new \Ds\Vector([10, 20, 13, 25]);   // Display the first element from the sequence var_dump($seq->first());   // Create new sequence $seq = new \Ds\Vector(['G', 'e', 'e', 'k', 's']);   // Display the first element from the sequence var_dump($seq->first());   ?> |
Output:
int(10) string(1) "G"
Example 2:
<?php   // Create new sequence $seq = new \Ds\Vector([21, 23, 'p', 'x']);   // Display the first element // from the sequence var_dump($seq->first());   // Function to push an element $seq->insert(0, "G");     // Display the first element // from the sequence var_dump($seq->first());   ?> |
Output:
int(21) string(1) "G"
Reference: http://php.net/manual/en/ds-sequence.first.php
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