(PECL apcu >= 5.0.0)
APCUIterator::valid — Checks if current position is valid
public APCUIterator::valid ( ) : bool
Checks if the current iterator position is valid.
This function has no parameters.
Returns true
if the current iterator position is valid, otherwise false
.
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https://www.php.net/manual/en/apcuiterator.valid.php