অপারেটর

<?php
  $first = "Learn";
  $second = "Computer";
  echo $first . " " . $second; // "Learn Computer"

  $greeting = "Hello, ";
  $greeting .= "world!"; // .= appends, same idea as +=
  echo $greeting;
?>

<?php
  var_dump(0 == "abc");   // false in modern PHP (was true pre-8.0 — a famous gotcha)
  var_dump(0 == "0");     // true — "0" converts to 0
  var_dump(0 === "0");    // false — different types, no conversion
  var_dump("5" == 5);     // true
  var_dump("5" === 5);    // false
?>

<?php
  $age = 20;
  $hasId = true;
  if ($age >= 18 && $hasId) {
    echo "Entry allowed.";
  }
?>