PHP Loops

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Online resources

• PHP.net
• W3Schools PHP
• Tutorials Point

Key concepts to understand

• Reasons to be mindful of infinite loops

• while() Loops

<?php
  $a = 0;
  while($a < 10) {
    echo $a;
    $a = $a + 1;
  }
  
?>

• for() Loops

<?php
  // Same behavior as the while loop
  for($a=0; $a < 10; $a++) {
    echo $a;
  }
?>

• foreach() Loops
  • Used with arrays and loops through all elements in order
  • Each element is assigned to a temporary variable

<?php
  $colors = ['red', 'orange', 'yellow', 'green', 'blue', 'purple'];
  
  foreach($colors as $color) {
    echo $color;
  }
?>

* Associative arrays assign key and value to temporary variables

<?php
  $color_fruit = ['red' => 'apple', 'orange' => 'orange', 'yellow' => 'lemon', 'green' => 'lime', 'purple' => 'plum'];
  
  foreach($colors as $color => $fruit) {
    echo "{$fruit} is {$color}.";
  }
?>

• continue, break
  • Continue skips immediately to the start of the next loop
  • Break immediately stops all looping