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 notprint($str->valid()); ?> |
Output:
1
Program 2:
<?php // Create an empty SplObjectStorage$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
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