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Highlight

Type:	code fragment
Added by:	Souldrinker
Entered:	10/08/2001
Last modified:	08/12/2000
Rating:	- (fewer than 3 votes)
Views:	5474

This Function allows it to highlight assigned Parts (needle) of a string (hystack) with pre defined HTML-Tags by only once call of function. Surely, in PHP4 it would be much easier to realise such a function - but this function works in PHP3, too. To define the tags that highlight the needle in the hystack-string use an array consisting of two values [0] (for opening the tag(s)) and [1] (for closing the tag(s)). The function doesn't do any echo's, it only returns the value, so you have to call it in order with echo to write what it returns.

<?php

                                
 function highlight($needle, $hystack, $hl) {

                            

                                $needle_length    = strlen($needle);                               


                                        

                                $cmp_hs        = strtolower ($hystack); 

                                $cmp_hl        = strlen     ($hystack);

                                $cmp_ne        = strtolower ($needle );

                                    $cmp_nl        = strlen     ($needle );

                                                    

                                    $i=0;

                                    $c=0;

                                                    

                                while($i<=$cmp_hl) {

                                                                                 


                                        if(substr($cmp_hs,$i,$cmp_nl)==$needle) {

                                                $to_bold_position[$c] = $i;

                                        $c++;

                                    }

                                                            


                                            $i++;

                                    }

                                                    

                                    $i=0;

                                    $temp='';

                                                    

                                do {

                                                            


                                        $j         =    $i - 1;                                


                                            $between     =    $to_bold_position[$i] - $to_bold_position[$j];

                                                            


                                    $temp2          =     substr($hystack,$to_bold_position[$j],$between);

                                            $temp            .=    eregi_replace($needle,"",$temp2);

                                            $temp         .=     "$hl[0]".substr($hystack,$to_bold_position[$i],$cmp_nl)."$hl[1]"; 

                                                            


                                            $i++;   

                                                                                     


                                    } while($i!=$c);

                            

                                $i=$i-1;

                                    $rest = $cmp_hl-$cmp_nl;

                                    $last = $to_bold_position[$i]+$cmp_nl;

                                                                                            


                                    $temp .= substr($hystack,$last,$rest);

                                                                                 


                                    return $temp;

                                

                            }

                                
 ?>

Usage Example

<?php

                            

                                include("highlight.php3");

                                

                                $bt[0]="<b>";

                                $bt[1]="</b>";

                                

                                echo highlight("test","dies ist ein test - zum testen der highlightfunktion",$bt);
 ?>

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