Detecting and changing strings in PHP

<?php // RAY_temp_regex_17.php
error_reporting(E_ALL);
 
/* * COMMETNS FROM THE OP AT EE
 * The four types of structure are as follows:
 *
 * 1 - "Product Name [DVD] [2000]"
 * 2 - "Product Name [DVD]"
 * 3 - "Product Name [2000]"
 * 4 - "Product Name"
 *
 * And the four transformations would be:
 
 * 1 - "Product Name [DVD]"
 * 2 - "Product Name [DVD]"
 * 3 - "Product Name" . $variable
 * 3 - "Product Name" . $variable // ? SHOULD THIS BE NUMBER 4 ?
 */
 
// TEST DATA
$arr = array('Gladiator [Blu-ray] [2000]',
             'Gladiator [DVD]',
             'Gladiator: Special Anniversary Edition',
             'Braveheart [1995]',
             );
 
// WHERE TO PUT THE OUTPUT
$out = array();
 
// NOT SURE WHAT IS EXPECTED IN $variable
$variable = 'VARIABLE';
 
// ITERATE OVER THE ARRAY
foreach ($arr as $thing)
{
   // ELIMINATE ANY BRACKETED 4-DIGIT NUMBER
   $thing = preg_replace('/ ?\[[0-9]{4}\]/', '', $thing);
 
   // ADD THE $variable IF PRODUCT NAME IS NOT FOLLOWED BY A BRACKET
   if (!strpos($thing, '[')) $thing .= $variable;
 
   // SAVE INTO THE OUTPUT
   $out[] = $thing;
}
 
// SHOW THE WORK
echo "<pre>\n";
print_r($out);

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