Prepares keywords for photo stock web sites: Shutterstock.com, iStockPhoto.com, Fotolia.com etc. Simple PHP parser script.

parse-stock-keys-from-desc.php

<?php
/*
  From a plain text/description of photo, makes list of keywords, separated with comma, filtering articles and prepositions.  
  Example:  
  INPUT: Portrait of a happy bald man photographer with professional digital camera on his neck, he throws tons 
  of leaves falling in the air in autumn park, enjoying the sunshine weather, glad and satisfied.  
  OUTPUT: portrait, happy, bald, man, photographer, professional, digital, camera, neck, throws, tons, leaves, falling, air, autumn, park, enjoying, sunshine, weather, glad, satisfied
*/
$exclude = array(
    'in', 'a', 'or', 'the', 'in', 'with', 'an', 'at', 'on', 'from', 'and', 'to', 'of', 'is', 'her', 'his', 'he', 'she', 'it'
    
);
$t = ''; 
$res = array();
if (isset($_POST['text'])) {
    $t = $_POST['text'];
    $ar = explode(" ", $t);
    foreach ($ar as $w) {
        $add = 0;
        $w = strtolower($w);
        $w = preg_replace("#[^a-z]#si", "", $w);
        if ($w and !in_array($w, $exclude)) {
            $add = 1;
        }
        
        if ($add) {
            $res[] = $w;
        }
    }
    echo count($res)."<pre>";print_r($res);    
    $t = implode(", ", $res);
}
echo "<pre>{$t}</pre>";
?>
<title>Keywords</title>
<p>
<form action="keys.php" method="post">
    <textarea name="text" rows="10" cols="100"></textarea>
    <input type="submit">
</form>
</p>