Determine the first and last iteration in a foreach loop in PHP?

<?php

// PHP program to get first and
// last iteration

// Declare an array and initialize it
$myarray = array( 1, 2, 3, 4, 5, 6 );

// Declare a counter variable and
// initialize it with 0
$counter = 0;

// Loop starts from here
foreach ($myarray as $item) {
    
    // Check condition if count is 0 then 
    // it is the first iteration
    if( $counter == 0 ) {
        
        // Print the array content
        print( $item );
        print(": First iteration \n");
    }
    
    // Check condition if count is length -1 
    // then it is last iteration
    if( $counter == count( $myarray ) - 1) {
        
        // Print the array content
        print( $item );
        print(": Last iteration");
    }
        
    $counter = $counter + 1;
}

?>

<?php

// PHP program to get first and last iteration
// and ignore duplicates of the first and last values.

$myarray = array( 1, 2, 3, 4, 5, 6 );

// Flags to track first and last iterations
$firstProcessed = false;
$lastProcessed = false;

foreach ( $myarray as $item ) {

    // Check first element
    if ( !$firstProcessed && $item === reset( $myarray ) ) {
        print( $item . ": First iteration \n");
        $firstProcessed = true;
    }

    // Check last element
    else if( !$lastProcessed && $item === end( $myarray ) ) {
        print( $item . ": Last iteration \n");
        $lastProcessed = true;
    }
}
?>

<?php

// PHP program to get first and last iteration with duplicates ignored

$myarray = array( 1, 2, 3, 4, 5, 6 );

// Get first and last elements
$first = reset($myarray);
$last = end($myarray);

// Flags to track first and last display
$firstDisplayed = false;
$lastDisplayed = false;

foreach ($myarray as $key => $item) {

    // Display first element
    if ($item == $first && !$firstDisplayed) {
        print($item . ": First iteration \n");
        $firstDisplayed = true;
        continue;
    }
    
    // Display last element
    if ($item == $last && !$lastDisplayed && $key == array_key_last($myarray)) {
        print($item . ": Last iteration \n");
        $lastDisplayed = true;
    }
}
?>

<?php
// Declare an array and initialize it
$myarray = array(1, 2, 3, 4, 5, 6);

// Get the first and last keys of the array
$firstKey = array_key_first($myarray);
$lastKey = array_key_last($myarray);

// Loop starts here
foreach ($myarray as $key => $item) {
    // Check if the current key is the first key
    if ($key == $firstKey) {
        print($item);
        print(": First iteration \n");
    }

    // Check if the current key is the last key
    if ($key == $lastKey) {
        print($item);
        print(": Last iteration \n");
    }
}
?>