ProgramGuruTo create an empty set in PHP, you can use the SplObjectStorage class, which is the closest equivalent to a set data structure in PHP.
In this example,
SplObjectStorage class which is a built-in class in PHP that allows you to create a collection of objects, behaving similarly to a set.SplObjectStorage class by calling its constructor with no arguments.$set1 and assign it the result of calling the new SplObjectStorage() constructor.new SplObjectStorage() constructor creates a new, empty set-like storage.$set1 using the var_dump function to verify its contents.<?php
$set1 = new SplObjectStorage();
var_dump($set1);
?>object(SplObjectStorage)#1 (0) {
}In this example,
SplObjectStorage class to serve as our set by calling the new SplObjectStorage() constructor.$set2 and assign it the result of the new SplObjectStorage() constructor.stdClass and assign properties to them.$set2 using the attach method of the SplObjectStorage class.$set2 using the var_dump function to verify its contents.<?php
$set2 = new SplObjectStorage();
$object1 = new stdClass();
$object1->name = 'apple';
$set2->attach($object1);
$object2 = new stdClass();
$object2->name = 'banana';
$set2->attach($object2);
var_dump($set2);
?>object(SplObjectStorage)#1 (2) {
[0]=> object(stdClass)#2 (1) {
["name"]=> string(5) "apple"
}
[1]=> object(stdClass)#3 (1) {
["name"]=> string(6) "banana"
}
}In this tutorial, we learned How to create an Empty Set in PHP language with well detailed examples.