Question

I don’t understand the => part.

foreach ($_POST[‘tasks’] as $task_id => $v) {

What does it do in a foreach loop?

Answer 1

A foreach loops goes through each item in the array, much like a for loop. In this instance, the $task_id is the key and the $v is the value. For instance:

$arr = array('foo1' => 'bar1', 'foo2' => 'bar2');
foreach ($arr as $key => $value)
{
  echo $key; // Outputs "foo1" the first time around and "foo2" the second.
  echo $value; // Outputs "bar1" the first time around and" bar2" the second.
}

If no keys are specified, like in the following example, it uses the default index keys like so:

$arr = array('apple', 'banana', 'grape');
foreach ($arr as $i => $fruit)
{
  echo $i; // Echos 0 the first time around, 1 the second, and 2 the third.
  echo $fruit;
}

// Which is equivalent to:
for ($i = 0; $i < count($arr); $i++)
{
  echo $i;
  echo $arr[$i];
}