Trouble with bolding of search Keywords

[NoobPHP]

How should i allow bolding of keywords instead of just one..
It is to say if i were to search "PHP HELP", it should bold both "PHP" and "HELP" .

// Get the search variable from URL
  $var = @$_GET['q'] ;
//trim whitespace from the stored variable
  $trimmed = trim($var);
//separate key-phrases into keywords
  $trimmed_array = explode(" ",$trimmed);

  $aircraftTailNo   = preg_replace ( "'($var)'si" , "<b>$trimm</b>" , $row_linkcat[ '1' ] );
  $aircraftType     = preg_replace ( "'($var)'si" , "<b>$trimm</b>" , $row_linkcat[ '2' ] );
  $servicingType   = preg_replace ( "'($var)'si" , "<b>$trimm</b>" , $row_linkcat[ '3' ] );
  $airFrameHours = preg_replace ( "'($var)'si" , "<b>$trimm</b>" , $row_linkcat[ '4' ] );
  $defectInfo       = preg_replace ( "'($var)'si" , "<b>$trimm</b>" , $row_linkcat[ '5' ] );
  $rectifications   = preg_replace ( "'($var)'si" , "<b>$trimm</b>" , $row_linkcat[ '6' ] );
  $comments         = preg_replace ( "'($var)'si" , "<b>$trimm</b>" , $row_linkcat[ '7' ] );
  $relatedDoc       = preg_replace ( "'($var)'si" , "<b>$trimm</b>" , $row_linkcat[ '8' ] );

[Weedpacket]

$trimmed_array is as you have it....and assuming you tidy it a bit to make sure there is exactly one single space between words before you explode it;

// Just need to tweak the array a bit to make it preg_replace friendly.
foreach($trimmed_array as $k=>$word)
{
    $trimmed_array[$k] = '/\b'.preg_quote($word,'/').'\b/i';
}

//Now do the nasty.
$bold_text = preg_replace($trimmed_array, '<b>$0</b>', $text_to_bold);

A few things: preg_quote so that PCRE-special characters in the search term don't cause the wheels to fall off, \b to indicate word boundaries (so that searching for "prop" doesn't result in property); /s is not necessary because . isn't being used; and $0 means "whatever was matched".

[NoobPHP]

thanks for looking through the codes..
But i do not know why the searched keywords weren't bolded..
Previously.. i was able to bold single words ..

After i changed from

// Build SQL Query for each keyword entered
foreach ($trimmed_arrayKeyword as $trimmKeyword){
// EDIT HERE and specify your table and field names for the SQL query
$queryKeyword = "SELECT * FROM report WHERE AirCraftType LIKE \"%$trimmedKeyword%\" OR AircraftTailNo LIKE \"%$trimmedKeyword%\" OR ServicingType LIKE \"%$trimmedKeyword%\" OR DefectInfo LIKE \"%$trimmedKeyword%\" OR Rectifications like \"%$trimmedKeyword%\" OR Comments like \"%$trimmedKeyword%\" OR RelatedDoc like \"%$trimmedKeyword%\"";

$queryAircraftDisplay = "SELECT * from report where reportID != 0"; 
if (!empty($_GET['Keyword']))
{ 
$queryAircraftDisplay  .= " and reportID in ($newarr)";
}
echo $queryAircraftDisplay;
$resultAircraftDisplay = mysql_query($queryAircraftDisplay) or die ("couldn't execute query ".mysql_error()); 

while ($row = mysql_fetch_array($resultAircraftDisplay)) 
{ 

 //now let's make the keywords bold. To do that we will use preg_replace function.
  $aircraftType     = preg_replace ( "'($Keyword)'si" , "<b>$trimmKeyword</b>" ,$row[ '1' ]); 

to this in hope to do multiple keywords bolding .. however, none of the keywords were bolded ..

// Build SQL Query for each keyword entered
foreach ($trimmed_arrayKeyword as $trimmKeyword => $word){
[B]$trimmed_arrayKeyword[$trimmKeyword] = '/\b('.preg_quote($word,'/').')\b/i';  [/B]
// EDIT HERE and specify your table and field names for the SQL query
$queryKeyword = "SELECT * FROM report WHERE AirCraftType LIKE \"%$word%\" OR AircraftTailNo LIKE \"%$word%\" OR ServicingType LIKE \"%$word%\" OR DefectInfo LIKE \"%$word%\" OR Rectifications like \"%$word%\" OR Comments like \"%$word%\" OR RelatedDoc like \"%$word%\" LIMIT ".$InfoArray["MYSQL_LIMIT1"].", ".$InfoArray["MYSQL_LIMIT2"];


$queryAircraftDisplay = "SELECT * from report where reportID != 0"; 
if (!empty($_GET['Keyword']))
{ 
$queryAircraftDisplay  .= " and reportID in ($newarr)";
}

echo $queryAircraftDisplay;
$resultAircraftDisplay = mysql_query($queryAircraftDisplay) or die ("couldn't execute query ".mysql_error()); 
while ($row = mysql_fetch_array($resultAircraftDisplay)) 
{ 

 //now let's make the keywords bold. To do that we will use preg_replace function.
$aircraftType     = preg_replace("'$trimmed_arrayKeyword'", '<b>\\1</b>' , $row[1]);