How do I... (PHP. Searching Functions?)

[d22552000]

Are there any PHP functions or language varients that will search a variable or string for a certain string?  and that will return where it was found or even just a search that will return if it was found or not...

 

I was wondering this, trying to make a search engine for my site.  There was no PHP search function.. -,-.  Anyone know what I gotta do?

[pocobueno1388]

http://php.net/strstr

http://www.php.net/manual/en/function.strpos.php

http://www.php.net/manual/en/function.strrchr.php

 

Those are all string searching functions.

[d22552000]

But what exactly would it give me... would it return the byteface of the found string?

 

oh and BTW "strrchr — Find the last occurrence of a character in a string" completely useless to me, only searches a character at a time.  Thanks for hte first two links though.

 

PHP FTW!

[d22552000]

<?PHP

function search($mystring='abcaaab',$findme='a',$debug=1) {

   $res[0] = strpos($mystring, $findme); $r=0;
   $len=strlen($mystring); $result=1;

   while ($r!=$len) {$result++; $r++;
       $res[$result] = strpos($mystring, $findme, $pos);
       $pos=$res[$result]+1; $res[$result]=$res[$result]+1;

       if ($res[$result]==$len-1) {
           break;
           }
       }

   $result.=" Results";

   if ($res[0] === false) {
       echo "Your search criteria returned no results.<br /><br />";
       if ($debug=1) {
           echo "Debug: '\$findme'='$findme'; '\$mystring'='$mystring'";
           }
       } else {
       echo "Your search returned $result:<br /><br />";
       if ($debug=1) {
           echo "Debug: '\$findme'='$findme'; '\$mystring'='$mystring'<br />";
           }
       foreach ($res as $value) {
           echo "<br /> $value";
           }
       }
   unset($l); unset($len); unset($res); unset($value); unset($result);
   }

?>

 

This is the code im using now as my search class.

I have one problem... How would I detect the end of results to end my while?

 

I tried calling my function with:

 

search('This is a sentance','a');

The output is

Your search returned 19 Results:

Debug: '$findme'='a'; '$mystring'='This is a sentance'

8
9
15
1
9
15
1
9
15
1
9
15
1
9
15
1
9
15
1

 

But it returns the results about 5 times before exiting. How would I detect the end of the string has been reached?

[remlabm]

<?php
$subject = "abcdef";
$pattern = '/^def/';
preg_match($pattern, $subject, $matches, PREG_OFFSET_CAPTURE, 3);
print_r($matches);
?> 

 

http://us3.php.net/manual/en/function.preg-match.php

[d22552000]

the problem with your fix is that the last three letters will not always be def...