Search instead filename - php

Question

I have this script to search file into a directory.
Works well when i perform search with exactly term, example: "my file.doc", "sales order 1234.pdf"
Can anyone help me to modify to search word into filename, example: "file" ou "Sales"
TKS
Cris.
<?php
if($_POST['search']) {
$word = $_POST['file'];
$dir = './';
$list = new RecursiveDirectoryIterator($dir);
$recursive = new RecursiveIteratorIterator($list);
$num = 0; //
foreach($recursive as $obj){
//echo $obj->getFilename().'<br />';
if($obj->getFilename()=="$word"){
echo $obj->getPathname().'<br/>';
$num++;
}
}
echo "found(s) $num file(s).";
}
?>
<form action="" method="POST">
search files. <input type="text" name="file" value="">
<input type="submit" name="search">
</form>

Answer 1

<?php
if($_POST['search']) {
$word = $_POST['file'];
$dir = './';
$list = new RecursiveDirectoryIterator($dir);
$recursive = new RecursiveIteratorIterator($list);
$num = 0; //
foreach($recursive as $obj){
//echo $obj->getFilename().'<br />';
if( strpos( $obj->getFilename(), "$word" ) === true ){
echo $obj->getPathname().'<br/>';
$num++;
}
}
echo "found(s) $num file(s).";
}
?>
<form action="" method="POST">
search files. <input type="text" name="file" value="">
<input type="submit" name="search">
</form>

Answer 2

You can use the strpos function or the strstr function on your filename.
Test if the function returns something different than false to know your filename contains your chain.

Answer 3

You can use PHP's substr_count to count the occurrences of a string in another, but since you need one or more you can check like this:
if( substr_count( $obj->getFilename(), $word ) ){
echo $obj->getPathname().'<br/>';
$num++;
}
edit: for case-insensitive comparison:
if( substr_count( strtolower($obj->getFilename()), strtolower($word) ) {
// ...
}