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
