PHP Help with "if" statement to dynamically include files - php

Question

I have these files:
"id_1_1.php", "id_1_2.php", "id_1_3.php" etc
"id_2_1.php", "id_2_2.php", "id_2_3.php" etc
the number of files is not known because will always grow..
all the files are in same directory..
I want to make a if statement:
to include the files only if their name ends with "_1"
another function to load all the files that start with "id_1"
How can I do this? Thank you!
edit1: no the numbers will not be skipped, once I have another item for id_1_ collection of products I will add new ones as id_1_1, id_1_2 etc.. so no skipping..

Answer 1

// Each of these:
// - scans the directory for all files
// - checks each file
// - for each file, does it match the pattern described
// - if it does, expand the path
// - include the file once
function includeFilesBeginningWith($dir, $str) {
$files = scandir($dir);
foreach ($files as $file) {
if (strpos($file, $str) === 0) {
$path = $dir . '/' . $file;
include_once($path);
}
}
}
function includeFilesEndingWith($dir, $str) {
$files = scandir($dir);
foreach ($files as $file) {
if (strpos(strrev($file), strrev($str)) === 0) {
$path = $dir . '/' . $file;
include_once($path);
}
}
}
/* To use: - the first parameter is ".",
the current directory, you may want to
change this */
includeFilesBeginningWith('.', 'id_1');
includeFilesEndingWith('.', '_1.php');

Answer 2

Loosely based on Svisstack's original answer (untested):
function doIncludes($pre='',$post=''){
for ($i=1;1;$i++)
if (file_exists($str=$pre.$i.$post.'.php'))
include($str);
else
return;
}
function first_function(){
doIncludes('id_','_1');
}
function second_function(){
doIncludes('id_1_');
}

Answer 3

function my_include($f, $s)
{
#include_once("id_" . $f . "_" . $s . ".php");
}
function first_function($howmany = 100, $whatstart = '1')
{
for ($i=1; $i <= $howmany; $i++)
{
my_include('1', $i)
}
}
function second_function($howmany = 100, $whatend = '1')
{
for ($i=1; $i <= $howmany; $i++)
{
my_include($i, '1');
}
}

Answer 4

This will parse through every file incrementing by one until it finds a file that doesn't exist. Assuming contiguous numbers it should catch every existing file. If you want to include files with a number other then 1 in the name, just change $lookingfor as appropriate.
$lookingfor = 1;
$firstnum=1;
while ($firstnum>0) {
$secondnum=1;
while ($secondnum>0) {
$tempfilename = "id_".$firstnum."_".$secondnum.".php";
if file_exists($tempfilename) {
if (($firstnum==$lookingfor)||($secondnum==$lookingfor)) {include $tempfilename; }
$secondnum++;
} else {
$secondnum=-1;
}
}
$firstnum++;
}