The Ds\Sequence::contains() function is an inbuilt function in PHP which is used to check the given value exists in the sequence or not.
Syntax:
bool abstract public Ds\Sequence::contains ([ mixed $...values ] )
Parameter: This function accepts single or many values which need to check the value exist in the sequence or not.
Return value: If value exist in the sequence then it returns True otherwise returns False.
Below programs illustrate the Ds\Sequence::contains() function in PHP:
Program 1:
<?php   // Create a sequence $seq = new \Ds\Vector(['G', 'e', 'e', 'k', 's', 5, 2, 7]);   // Use contains() function to check elements // exist in the sequence or not var_dump($seq->contains('G'));   var_dump($seq->contains('k'));   var_dump($seq->contains('p'));   var_dump($seq->contains(7));   var_dump($seq->contains('5'));   ?> |
Output:
bool(true) bool(true) bool(false) bool(true) bool(false)
Program 2:
<?php   // Create a sequence $seq = new \Ds\Vector(['G', 'e', 'e', 'k', 's', 5, 2, 7]);   // Use contains() function to check elements // exist in the sequence or not var_dump($seq->contains('G', 'e'));   var_dump($seq->contains('k', 'e', 7));   var_dump($seq->contains('p', '1'));   var_dump($seq->contains(7, 1));   var_dump($seq->contains('5', 5));   ?> |
Output:
bool(true) bool(true) bool(false) bool(false) bool(false)
Reference: http://php.net/manual/en/ds-sequence.contains.php
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