PHP-如何通过从GET接收的键获取数组值

Question

How do I Loop through all phrases and output them as a list of links, with GET-parameters?

How do I make an array, indexed with integers then use a GET-variable to choose one of these phrases.

My code so far;

$arr = array('1' => 'Que será, será.', '2' => 'C’est la vie!', '3' => 'Sich nicht um ungelegte Eier kümmern.', '4' => 'Ada asap, ada api.', '5' => 'Batti il ferro finché è caldo.');
?> 

<p><?php print $arr[1]; ?> - Whatever will be, will be.</p>
<p><?php print $arr[2]; ?> – That’s the life.</p> 
<p><?php print $arr[3]; ?> - Don’t count your chickens before they hatch.</p> 
<p><?php print $arr[4]; ?> - There's no smoke without fire.</p> 
<p><?php print $arr[5]; ?> - Strike while the iron is hot.</p>

Answer 1

This should do it:

$key = (int)$_GET['key'];
if (isset($arr[$key]) {
   echo print $arr[$key]; 
} else {
   echo "Invalid option specified";
}

Answer 2

<?php  
  $key = mysql_real_escape_string($_GET['value']);//Pass this value from url and sanitize the inputs
  ?>
  <p><?php print $arr[$key]; ?>

Answer 3

$key = $_GET['index'];
$val = isset($arr[$key]) ? $arr[$key] : false;

Edit: Why do people keep recommending mysql_real_escape_string? This is for database query escaping and sends a request to the database (as far as I understand). The key doesn't even need escaping as it's not being sent to the database or output.