การวนรอบ

    <?php

    $num = 1;

    echo 'Count from 1 to 10: ';
    while ($num<=10) {
         echo $num . ', ';
         $num++;
    }

    $readable = false;
    while ($num <= 10):
         // this code is never execute.
         echo 'Reading file...';
    endwhile;

    <?php

    $readable = false;
    $msg = 'Checking status...';
    do {
         // this code will execute ONLY one time.
         echo $msg . '&#60;br /&#62;';
         if ($readable == true) {
              $msg = 'Reading file...';
         }
    } while ($readable);

    <?php

    echo 'Count from 1 to 10: ';
    for($i = 0; $i <= 10; $i++) {
         echo $i . ', ';
    }

    // Same as above
    for($i = 0; $i <= 10; $i++):
         echo $i . ', ';
    endfor;

    <?php

    $all_subjects = array('Math', 'Science', 'Drawing');
    echo 'I learn ';
    foreach($all_subjects as $subj) {
         echo $subj . ', ';
    }

    // loop through Associative Arrays
    $instructors = array(
         'Math'    => 'Andre Marie Ampere',
         'Science' => 'Albert Einstein',
         'Drawing' => 'Leonardo da Vinci',

    );
    
    foreach($instructors as $subject => $teacher):
         echo $teacher . ' teach ' . $subject . '&#60;br /&#62;';
    endforeach;

    // you can change value in array by use reference prefix (&)
    $double_this = array(1, 2, 3, 4, 5);
    foreach($double_this as &$num) {
         $num = $num * 2;
    }
    // $double_this = array(2, 4, 6, 8, 10)

    <?php

    // print: Count from 1 to 5: 1, 2, 3, 4, 5, 
    echo 'Count from 1 to 5: ';
    for($i = 0; $i <= 10; $i++) {
         if ($i > 5) {
              // break out of loop
              break;
         }
         echo $i . ', ';
    }

    <?php

    // print: Simple even number: 2, 4, 6, 8, 10, 
    echo 'Simple even number: ';
    for($i = 1; $i <= 10; $i++) {
         if (($i % 2) == 1) {
              // Odd number? skip this loop
              continue;
         }
         echo $i . ', ';
    }