[Resolved] Array filter?

[stephdumais]

Hi, I'd like to create a function that first creates an array out of the contents of a directory, then apply a filter that outputs a new array of only the elements containing a certain string, such as file extensions for example.

I dont really understand how array_filter works or even if that's what I really need in this case.

Can anyone help?

Thanks

[dalecosp]

Example:

<?

$myarray=array("dog.com", "frog.exe", "cat.com", "wolf.com", "rabbit.net");
# USE READDIR() OR WHATEVER TO GET YOUR ARRAY...

function getCom($var) {
   return (!strtok("com", $var));
   } # EOF.  I'm uncertain why the negative test worked in this case...

echo "Coms :\n";
$coms=(array_filter($myarray, "getCom"));
echo "<br>";
$x=0;
while ($x<count($myarray)) { //note that you need to count the ORIGINAL array, not the $coms (rendered) array...
   if ($coms[$x]) {
      echo $coms[$x];
      echo "<br>";
      $x++;
      }
   else { $x++; }
   }
?>

Try this---see if you think it does anything like what you need 🙂 🙂

[codeDV]

Try this:

<?php
     $array = Array("pic1.jpeg", "index.html", "kinfe.gif", "RFC200.txt", "submit.php", "arrange.php");

 // remember array indexes are presevers in the returned array
 print_r(preg_grep ("/\.php$/",$array));
?>

The preg_grep() function searches each item in the array passed in the second argument for a match with the regular expression pattern in argument one. It returns an array with

For more information on this function see the documentation.

[stephdumais]

Thanks guys, the second solution seems obviously better since it's pretty straightforward and I think it should allow me to look up not only extensions but also strings within the elements. You see, my example called for filtering file extensions but I was looking for something a bit more universal. I tried replacing the .php in the example with text that could be found in the filenames like so:

print_r(preg_grep ("/.php$/",$array)); ---->

print_r(preg_grep ("image",$array));

But this doesn'y work. I'm simply unsure about the syntax here.

If my array elements are as follows:

1_image, 2_image, 1_bigthing, 2_bigthing

How would I filter for only the elements containing the word "image" ?

Thanks again

[barand]

More general filter:-

function myfilter($item) {
    global $g_needle;
    return strpos($item, $g_needle) !==false;
}

$myarray = array('1_image',' 2_image', '1_bigthing', '2_bigthing');

$g_needle = 'image';  // set the criteria

$im_array = array_filter($myarray, 'myfilter');

hth

[stephdumais]

Works perfectly. And I could also use it reversly by simply taking out the '!'
Thanks 🙂