What is the method for iterating over an array in PHP?

There are several methods for traversing arrays in PHP.

1. By using a foreach loop: By using a foreach loop, you can easily iterate through each element in an array. Example code is as follows:

$array = [1, 2, 3, 4, 5];
foreach ($array as $value) {
    echo $value;
}

1. Using a for loop: You can use a for loop along with the count function to iterate through each element in the array by getting the length of the array. An example code is shown below:

$array = [1, 2, 3, 4, 5];
$length = count($array);
for ($i = 0; $i < $length; $i++) {
    echo $array[$i];
}

1. You can use a while loop along with the list function to iterate through each key and value in an associative array. Here’s an example code:

$array = ['name' => 'John', 'age' => 25, 'city' => 'New York'];
reset($array);
while (list($key, $value) = each($array)) {
    echo $key . ': ' . $value;
}

1. You can use the array_map function to apply a callback function to each element in an array. Here is an example code:

$array = [1, 2, 3, 4, 5];
function square($value) {
    return $value * $value;
}
$result = array_map('square', $array);
print_r($result);

1. The array_walk function can be used to apply a user-defined function to each element in an array. Here is an example code:

$array = [1, 2, 3, 4, 5];
function cube(&$value) {
    $value = $value * $value * $value;
}
array_walk($array, 'cube');
print_r($array);