PHP/if()

sample1

１０より大きい

sample1code

if($x<10){
  echo "１０より小さい";
} else {
  echo "１０より大きい";
}

sample2

不正解

sample2code

$sample2 = $x < $y;
if($sample2 == true){
  echo "正解";
	} else {
  echo "不正解";
}

sample3 2

sample3code

$z = "10";
if($z === 10){
  echo "1";
} else if($z == 10){
  echo "2";
} else {
  echo "3";
}

smaple4

年下

sample4code

$s4Array = ["年下", "同年代", "年上"];
$s4Text = htmlspecialchars($_POST["s4Text"]);
if($s4Text < 30){
  $age = 0;
} else if($s4Text >= 30 && $s4Text < 40){
  $age = 1;
} else {
  $age = 2;
}
echo $s4Array[$age];