PHP SplObjectStorage valid() Function

The SplObjectStorage::valid() function is an inbuilt function in PHP which is used to check the current storage entry is valid or not.

Syntax:

bool SplObjectStorage::valid()

Parameters: This function does not accept any parameter.

Return Value: This function returns true if the iterator entry is valid, false otherwise.

Below programs illustrate the SplObjectStorage::valid() function in PHP:

Program 1:

<?php

// Create an empty SplObjectStorage
$str = new SplObjectStorage();

$obj = new StdClass;
$obj2 = new StdClass;
$obj3 = new StdClass;

// Use attach() function to
// add object
$str->attach($obj, "GFG");

// Use rewind() function to rewind the
// iterator to the first storage element
$str->rewind();

// Use valid() function to check current
// iterator is valid entry or not
print($str->valid());

?>

Output:

1

Program 2:

<?php

// Create an empty SplObjectStorage
$gfg = new SplObjectStorage();

$obj1 = new StdClass;
$obj2 = new StdClass;
$obj3 = new StdClass;

$gfg[$obj1] = "GFG";
$gfg[$obj2] = "GeeksClasses";
$gfg[$obj3] = "SUDO";


// Use rewind function
$gfg->rewind();

while($gfg->valid()) {

    var_dump($gfg->getInfo());

    // Moving to next element
    $gfg->next();
}
?>

Output:

string(3) "GFG"
string(12) "GeeksClasses"
string(4) "SUDO"

Reference: https://www.php.net/manual/en/splobjectstorage.valid.php