php foreach loop

foreach ($prices as $key => $value) {
 echo $key." – ".$value."<br />";
}

<?php
$arr = array(1, 2, 3, 4);
foreach ($arr as &$value) {
    $value = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
unset($value); // break the reference with the last element
?>

<?php  
    $season = array ("Summer", "Winter", "Autumn", "Rainy");  
    foreach ($season as $element) {  
        echo "$element";  
        echo "</br>";  
    }  
?>

<?php  
    $a = array();  
    $a[0][0] = "Alex";  
    $a[0][1] = "Bob";  
    $a[1][0] = "Camila";  
    $a[1][1] = "Denial";  
    foreach ($a as $e1) {  
        foreach ($e1 as $e2) {  
            echo "$e2\n";  
        }  
    }  
?>