"Jason Wong" <[EMAIL PROTECTED]> wrote in message
news:000301c1428d$f11b3a80$[EMAIL PROTECTED]...
> The obvious first thing to do is to screen your keywords. Do not search on
> common words such as:
>
> and, if, the, in etc.
An easy way to do this is to set up an array of words
to exclude. Then you can parse your input string and
use array_diff() to return only the non-excluded words, ie
<?php
// Assume we get $searchphrase from a form
// Strip all non-alpha text from string;
// anyone know a more convenient f'n for this?
// NOTE: this list is quite incomplete.
// NOTE: can also use this step to convert
// accented characters to their plain counterparts.
$conv = array(
"0" => "",
"1" => "",
"2" => "",
"3" => "",
"4" => "",
"5" => "",
"6" => "",
"7" => "",
"8" => "",
"9" => "",
"!" => "",
"&" => "",
"\n" => "",
"\t" => "",
"." => "",
"<" => "",
">" => "",
"\\" => "",
);
$searchphrase = strtr(strtolower($searchphrase), $conv)
// Parse input string into an array of words
$use = explode(" ", $searchphrase);
// Add any other too-common words that occur to you.
$excl = array(
'i', 'you', 'he', 'she', 'it', 'am', 'is', 'be', 'are',
'to', 'from', 'if', 'the', 'this', 'that', 'in', 'of', 'at',
'a', 'an', 'and', 'or', 'not'
);
// Filter out too-common words
$use = array_diff($use, $excl);
if (count($use) == 0) {
echo "No valid search terms";
exit();
}
// The FALSE is a dummy term so I don't
// have to muck about deciding whether an
// OR is needed for each search term.
$query = 'SELECT * FROM table WHERE FALSE';
foreach($use as $term)
$query .= " OR keywords LIKE '%$term%'";
?>
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