today i was writing a script in php in which i had a loop evaluate all each string, if the string contained a particular part, i wanted to add the string to an element of the array. so this is how i did it using this code

my scenario was that i wanted to get a list of all the files where the php script was ran, after i got a list of all the files, i wanted to check each file which the name 'restricted' on it, like for example, i had these files in my directory:

friendly.php
restricted-colors.php
open.php
restricted-passwords.php
functions.php


as you can see from my list, there are two files which contain the word restricted as their file name. so i wanted to only save these files into an array, so this is the PHP code i used to achieve what i wanted. 

if ($handle = opendir('.')) {
    $stack = array();
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
            if(strstr($file,'restricted')){
                array_push($stack, $file);
            }
        }
    }
    closedir($handle);
}


you can get more help about the array_push() function at http://php.net/manual/en/function.array-push.php