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