The Ds\Vector::isEmpty() function is an inbuilt function in PHP which is used to check the vector is empty or not.
Syntax:
bool public Ds\Vector::isEmpty( void )
Parameters: This function does not accept any parameter.
Return Value: This function returns true if the vector is empty, false otherwise.
Below programs illustrate the Ds\Vector::isEmpty() function in PHP:
Program 1:
<?php // Create new vector $vector = new \Ds\Vector([1, 2, 4, 5]); // Use isEmpty() function to // check vector var_dump($vector->isEmpty()); // Use clear() function to remove // vector elements $vector->clear(); // Use isEmpty() function var_dump($vector->isEmpty()); ?> |
Output:
bool(false) bool(true)
Program 2:
<?php // Create new vector $vector = new \Ds\Vector(["neveropen", "for", "neveropen"]); // Use isEmpty() function to // check vector var_dump($vector->isEmpty()); // Use clear() function to remove // vector elements $vector->clear(); // Use isEmpty() function var_dump($vector->isEmpty()); ?> |
Output:
bool(false) bool(true)
Reference: http://php.net/manual/en/ds-vector.isempty.php
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