PHP Conditionals

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Online resources

• PHP.net
• W3Schools PHP
• Tutorials Point

Key concepts to understand

• if(), elsif(), else()
  • Syntax
  • How conditional determines execution of code

<?php
  $alice = 25;
  $bobby = 20;
  if ($alice < $bobby) {
    echo "Alice has less than Bobby.";
  } elseif ($alice > $bobby) {
    echo "Alice has more than Bobby.";
  } else {
    echo "Alice has the same as Bobby.";
  }
?>

• Comparison operators

  • ==
  • !=
  • <, <=, >, >=, <>
  • ===

• Logical operators

  • &&
  • ||
  • !

• switch()

  • Syntax
  • Why one should use "break" after each case

<?php
  switch($i) {
    case 0:
      echo "i equals 0";
      break;
    case 1:
      echo "i equals 1";
      break;
    case 2:
      echo "i equals 2";
      break;
    default:
      echo "i is not equal to 0, 1 or 2";
      break;
  }
?>