<h5>STEP1</h5>
<?php
echo "PHP!!"
?>


<h5>STEP2</h5>
<p>・問題１</p>
<?php
$n = 6;
if (n < 10) {
  echo "small";
} else {
  echo "large";
}
?>

<p>・問題2</p>
<?php
$a = 5;
$b = 1;
if ($a < $b) {
  echo $a;
} else {
  echo $b;
}
?>

<p>・問題3</p>
<?php
$a = 5;
$b = 1;
$tmp = $a;
$a = $b;
$b = $tmp;
echo "a = ${a}, ";
echo "b = ${b}";
?>

<p>・問題4</p>
<?php
for($i=0; $i<10; $i++) {
  echo $i;
}
?>

<p>・問題5</p>
<?php
$n = 10;
for($i=0; $i<=$n; $i++) {
  for($t=0; $t<$i; $t++) {
    echo "x";
  }
  echo "<br/>";
}
?>

<p>・問題6</p>
<?php
$array = [1, 2, 3];
print_r($array);
?>

<p>・問題7</p>
<?php
$array = [1, 2, 3];
for($i=0; $i<count($array); $i++) {
  echo $array[$i] . "<br/>";
}
?>

<p>・問題8</p>
<?php
$a = [3, 5, 7];
array_push($a, 3, 6, 7, 8);
$a = array_unique($a);
print_r($a);
?>

<p>・問題9</p>
<?php
$array = [1, 2, 3];
function sum($array) {
  $a = count($array);
  for($i=0; $i<$a; $i++) {
    $n += $array[$i];
  }
  echo $n;
}
sum($array)
?>

<p>・問題10</p>
<?php
$array = [1, 2, 3];
function average($array) {
  $count = count($array);
  for($i=0; $i<$count; $i++) {
    $n += $array[$i];
  }
  $s = $n / $count;
  echo $s;
}
average($array)
?>

<p>・問題11</p>
<ul>
  <?php
  $nums = [1, 2, 3];
  foreach ($nums as $n) :
  ?>
  <li><?php echo "$n"."<br/>"; ?></li>
  <?php endforeach; ?>
</ul>

<p>・問題12</p>
<?php
$nums = [1, 2, 3, 4, 5, 6, 7];
function echo_array($nums) {
  $new_nums = [];
  foreach ($nums as $n) :
    $s += $n;
    if ($s > 15) {
      break;
    }
    array_push($new_nums, $n);
  endforeach;
  print_r($new_nums);
}
echo_array($nums)
?>

<p>・問題13</p>
<?php
$hash = array("key1" => 1, "key2" => 2, "key3" => 3);
print_r($hash);
?>

<p>・問題14</p>
<?php
echo $hash["key2"];
?>

<p>・問題15</p>
<?php
$new_hash = array_merge($hash, array("key4" => 4));
print_r($new_hash);
?>

<p>・問題16</p>
<?php
foreach ($new_hash as $key => $value) :
  echo "\"" . $key . "\nis\n " . $value . "\"<br/>";
endforeach
?>