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PHP | ArrayIterator valid() Function

Last Updated : 21 Nov, 2019
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The ArrayIterator::valid() function is an inbuilt function in PHP which is used to check whether an array contains more entries or not. Syntax: 
bool ArrayIterator::valid( void )
Parameters: This function does not accept any parameters. Return Value: This function returns TRUE if the iterator is valid, FALSE otherwise. Below programs illustrate the ArrayIterator::valid() function in PHP: Program 1: php 
<?php

// Declare an ArrayIterator
$arrItr = new ArrayIterator(
    array('G', 'e', 'e', 'k', 's')
);

while ($arrItr->valid()) {
    echo "ArrayIterator Key: " . $arrItr->key() .
    "  ArrayIterator Value: " . $arrItr->current() . "\n";
    
    $arrItr->next();
}

?>
Output: 
ArrayIterator Key: 0  ArrayIterator Value: G
ArrayIterator Key: 1  ArrayIterator Value: e
ArrayIterator Key: 2  ArrayIterator Value: e
ArrayIterator Key: 3  ArrayIterator Value: k
ArrayIterator Key: 4  ArrayIterator Value: s
Program 2: php 
<?php
   
// Declare an ArrayIterator
$arrItr = new ArrayIterator(
    array(
        "a" => "Geeks",
        "b" => "for",
        "c" => "Geeks"
    )
);

// Using rewind function 
$arrItr->rewind(); 
    
while($arrItr->valid()) { 
    var_dump($arrItr->current()); 
        
    // Moving to next element 
    $arrItr->next(); 
} 
   
?>
Output: 
string(5) "Geeks"
string(3) "for"
string(5) "Geeks"
Reference: https://www.php.net/manual/en/arrayiterator.valid.php

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