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<?php
  $ary = array(1, 2);
  print "ary = ";
  var_dump($ary);

  $ary2 = array(3,4);
  $ary3 = array(1,2,3,4);
  $ary4 = $ary + $ary2;
  $ary5 = $ary2 + $ary;
  $ary6 = $ary + $ary3;
  $merged_array = array_merge($ary, $ary2);
  
  print "ary4 = ";
  var_dump($ary4);
  
  print "ary5 = ";
  var_dump($ary5);
  
  print "ary6 = ";
  var_dump($ary6);

  print "merged_array = ";
  var_dump($merged_array);
?>

ary = array(2) {
  [0]=>
  int(1)
  [1]=>
  int(2)
}
ary4 = array(2) {
  [0]=>
  int(1)
  [1]=>
  int(2)
}
ary5 = array(2) {
  [0]=>
  int(3)
  [1]=>
  int(4)
}

ary6 = array(4) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
}

merged_array = array(4) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
}

<?php 
  print "Hello, World!\n";
  PRINT "Hello, World!\n";
  prINT "Hello, World!\n";
?>

<?php
  $one = "1";
  $two = "2"; 
  $fif = "15hoge";
  $zero = "hoge";

  $var1 = $one + $two;
  $var2 = $one + $fif;
  $var3 = $one + $hoge;

  print $var1."\n"; //3
  print $var2."\n"; //16
  print $var3."\n"; //1
?>

unset ary6[2]
ary6 = array(3) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [3]=>
  int(4)
}

<?php
  $ary = array(1,2,3,4);
  unset($ary[2]);
  print "unset ary[2]\n";
  print "ary = ";
  var_dump($ary);
?>