用for循环和while循环和foreach循环数组

<?php

$kl = [1,3,5,7,9];

echo "for循环<br>";

for($i = 0 ; $i < count($kl) ; $i++){

    echo $kl[$i]."<hr>";

}

echo "while循环<br>";

$i = 0;

while($i < count($kl)){

    echo $kl[$i]."<hr>";

    $i++;

}

echo "foreach循环<br>";

foreach ( $kl as $value){

    echo $value ."<br>";

};