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for (initialization; condition; increment)
{
    code to be executed;
}

<?php
for ($i=1; $i<=5; $i++)
{
    echo "The number is " . $i . PHP_EOL;
}
?>

The number is 1
The number is 2
The number is 3
The number is 4
The number is 5

foreach ($array as $value)
{
    code to be executed;
}

foreach ($array as $key => $value)
{
    code to be executed;
}

<?php
$x = array("Google", "tutorialpro", "Taobao");
foreach ($x as $value)
{
    echo $value . PHP_EOL;
}
?>

Google
tutorialpro
Taobao

<?php
$x = array(1 => "Google", 2 => "tutorialpro", 3 => "Taobao");
foreach ($x as $key => $value)
{
    echo "Key is " . $key . ", value is " . $value . PHP_EOL;
}
?>

Key is 1, value is Google
Key is 2, value is tutorialpro
Key is 3, value is Taobao