switch文の使いどころの悩み ref: http://qiita.com/items/af2b304650272410ec29

file0.php

<?php
switch (true) {
    case 0:
        echo '数字の0';
        break;
    case '0':
        echo '文字列の0';
        break;
    case '0.0':
        echo '文字列の0.0';
        break;
    case true:
        echo '真偽値のtrue';
        break;
}

file1.php

<?php
if ($_GET['hoge'] === 'foo' || $_GET['hoge'] === 'moo' || $_GET['hoge'] === 'soo') {
  //...
} elseif ($_GET['hoge'] === 'baa' || $_GET['hoge'] === 'buu') {
  //...
}

file2.php

<?php
switch ($_GET['hoge']) {
  case 'foo': case 'moo': case 'soo':
    //...
    break;
  case 'baa': case 'buu':
    //...
    break;
}

file3.php

<?php
if (in_array($_GET['hoge'], ['foo', 'moo', 'soo'], true)) {
  //...
} elseif (in_array($_GET['hoge'], ['baa', 'buu'], true)) {
  //...
}