Iterator::rewind
Take consideration when utilizing this method and using the returned value of isset([value]). The value of isset([value]) will be false for null values.
I ran into this problem when checking isset([value]) against array elements whose value was null.
Example:
<?php
$array = array(null, 1, 2, 3);
$isSet = isset($array[0]);
var_dump($isSet); // output: boolean(false)
class AClass {
public $array = (null, 1, 2, 3);
function valid() {
return isset($this->array[0]);
}
}
$class = new AClass;
var_dump($class->valid()); // output: boolean(false)
?>
Iterator::valid
(PHP 5 >= 5.0.0)
Iterator::valid — Checks if current position is valid
Description
abstract public boolean Iterator::valid
( void
)
This method is called after Iterator::rewind() and Iterator::next() to check if the current position is valid.
Parameters
This function has no parameters.
Return Values
The return value will be casted to boolean and then evaluated. Returns TRUE on success or FALSE on failure.
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User Contributed Notes
Iterator::valid
hyponiq at gmail dot com
26-Sep-2011 04:12
seva dot lapsha at gmail dot com
01-Aug-2009 06:19
If Iterator::valid() returns false, the foreach() loop will be terminated.