Demonstrating the power of the preg_find() function

Example 1 listing the files in 'code' directory. 
$files = preg_find('/./', '../code');
foreach($files as $file) printf("<br>%s\n", $file);
Output:
../code/tail-f.phps
../code/tlds-alpha-by-domain.txt
../code/showvalidemail.php.txt
../code/str_rotN.php
../code/tail-10.php
../code/rc4.inc.php
../code/strnpos.php
../code/wordwrap_bigwords.phps
../code/showvalidemail2.php
../code/argparse.php
../code/validate_email.inc.phps.bak
../code/array_unique_recursive.php
../code/str_case.phps
../code/hexstr.phps
../code/array_unique_recursive.phps
../code/str_case.php
../code/rc4.inc.phps
../code/bcceil.php
../code/tail-10.phps
../code/hexstr.php
../code/days_of_year.php
../code/str_split.phps
../code/strnpos.phps
../code/parse_str_quoted.inc.php
../code/morse.php
../code/number_to_words_apathy.php
../code/rc4.inc.asp
../code/wordwrap_bigwords.php
../code/number_to_words_ex.phps
../code/number_to_words.phps
../code/recursive_readdir.php
../code/code_debug_timing.php
../code/number_to_words.php
../code/foo.php
../code/ftruncate.php
../code/rc4.php
../code/rc4.phps
../code/str_split.php
../code/runtimer.php
../code/runtimer.phps
../code/dirlister.phps
../code/single_astmatch.php
../code/dirlister.php
../code/dominicsayers.php
../code/showvalidemail4.php
../code/200501152253
../code/number_to_words_ex.php
../code/showvalidemail.php
../code/404.phps
../code/showvalidemail3.php
../code/recursive_readdir.phps
../code/404.php
../code/maillog.phps
../code/morse.phps
../code/validate_email.inc.phps
../code/tail-f.php
Note that the result is unsorted and in the same order as readdir() would return them.
Example 2 listing the files in 'code' directory, recursively. 
$files = preg_find('/./', '../code', PREG_FIND_RECURSIVE);
foreach($files as $file) printf("<br>%s\n", $file);
Output:
../code/tail-f.phps
../code/tlds-alpha-by-domain.txt
../code/showvalidemail.php.txt
../code/str_rotN.php
../code/tail-10.php
../code/rc4.inc.php
../code/strnpos.php
../code/wordwrap_bigwords.phps
../code/showvalidemail2.php
../code/argparse.php
../code/validate_email.inc.phps.bak
../code/array_unique_recursive.php
../code/str_case.phps
../code/hexstr.phps
../code/array_unique_recursive.phps
../code/str_case.php
../code/testdir/dir3/testfile3
../code/testdir/testfile1
../code/testdir/dir2/testfile2
../code/testdir/dir2/dir2.2/subdir/1/2/3/deepfile
../code/testdir/dir2/dir2.2/testfile4
../code/rc4.inc.phps
../code/bcceil.php
../code/tail-10.phps
../code/hexstr.php
../code/days_of_year.php
../code/str_split.phps
../code/strnpos.phps
../code/parse_str_quoted.inc.php
../code/morse.php
../code/number_to_words_apathy.php
../code/rc4.inc.asp
../code/wordwrap_bigwords.php
../code/number_to_words_ex.phps
../code/number_to_words.phps
../code/recursive_readdir.php
../code/code_debug_timing.php
../code/number_to_words.php
../code/foo.php
../code/ftruncate.php
../code/rc4.php
../code/rc4.phps
../code/str_split.php
../code/runtimer.php
../code/runtimer.phps
../code/dirlister.phps
../code/single_astmatch.php
../code/dirlister.php
../code/dominicsayers.php
../code/showvalidemail4.php
../code/200501152253
../code/number_to_words_ex.php
../code/showvalidemail.php
../code/404.phps
../code/showvalidemail3.php
../code/recursive_readdir.phps
../code/404.php
../code/maillog.phps
../code/morse.phps
../code/validate_email.inc.phps
../code/tail-f.php
Note that the result is semi-unsorted. Directories are followed in the order they are met.
Example 3 listing the directories in 'code' directory, recursively. 
$files = preg_find('/./', '../code', PREG_FIND_DIRONLY|PREG_FIND_RECURSIVE);
foreach($files as $file) printf("<br>%s\n", $file);
Output:
../code/testdir
../code/testdir/dir3
../code/testdir/dir2
../code/testdir/dir2/dir2.2
../code/testdir/dir2/dir2.2/subdir
../code/testdir/dir2/dir2.2/subdir/1
../code/testdir/dir2/dir2.2/subdir/1/2
../code/testdir/dir2/dir2.2/subdir/1/2/3
Note that the result is unsorted and in the same order as readdir() would return them.
Example 4 listing the files as per example 1, but this time we want to only get filenames that match a particular regex: /^str_.*?\.php$/D 
$files = preg_find('/^str_.*?\.php$/D', '../code');
foreach($files as $file) printf("<br>%s\n", $file);
Output:
../code/str_rotN.php
../code/str_case.php
../code/str_split.php
Note that the result is unsorted and in the same order as readdir() would return them.
Example 5 listing the files as per example 4, but this time lets see what the PREG_FIND_RETURNASSOC does to the result 
$files = preg_find('/^str_.*?\.php$/D', '../code', PREG_FIND_RETURNASSOC);
print_r($files);
Output:
Array
(
    [../code/str_rotN.php] => Array
        (
            [stat] => Array
                (
                    [0] => 2308
                    [1] => 14571947
                    [2] => 33204
                    [3] => 1
                    [4] => 1001
                    [5] => 1001
                    [6] => 0
                    [7] => 652
                    [8] => 1775692685
                    [9] => 1774894793
                    [10] => 1774894793
                    [11] => 4096
                    [12] => 8
                    [dev] => 2308
                    [ino] => 14571947
                    [mode] => 33204
                    [nlink] => 1
                    [uid] => 1001
                    [gid] => 1001
                    [rdev] => 0
                    [size] => 652
                    [atime] => 1775692685
                    [mtime] => 1774894793
                    [ctime] => 1774894793
                    [blksize] => 4096
                    [blocks] => 8
                )

            [du] => 4096
            [uid] => 1001
            [gid] => 1001
            [filetype] => file
            [mimetype] => text/x-php
            [dirname] => ../code
            [basename] => str_rotN.php
            [ext] => php
            [owner] => 
        )

    [../code/str_case.php] => Array
        (
            [stat] => Array
                (
                    [0] => 2308
                    [1] => 14571945
                    [2] => 33204
                    [3] => 1
                    [4] => 1001
                    [5] => 1001
                    [6] => 0
                    [7] => 2903
                    [8] => 1775692685
                    [9] => 1774894793
                    [10] => 1774894793
                    [11] => 4096
                    [12] => 8
                    [dev] => 2308
                    [ino] => 14571945
                    [mode] => 33204
                    [nlink] => 1
                    [uid] => 1001
                    [gid] => 1001
                    [rdev] => 0
                    [size] => 2903
                    [atime] => 1775692685
                    [mtime] => 1774894793
                    [ctime] => 1774894793
                    [blksize] => 4096
                    [blocks] => 8
                )

            [du] => 4096
            [uid] => 1001
            [gid] => 1001
            [filetype] => file
            [mimetype] => text/x-php
            [dirname] => ../code
            [basename] => str_case.php
            [ext] => php
            [owner] => 
        )

    [../code/str_split.php] => Array
        (
            [stat] => Array
                (
                    [0] => 2308
                    [1] => 14571948
                    [2] => 33204
                    [3] => 1
                    [4] => 1001
                    [5] => 1001
                    [6] => 0
                    [7] => 745
                    [8] => 1775692685
                    [9] => 1774894793
                    [10] => 1774894793
                    [11] => 4096
                    [12] => 8
                    [dev] => 2308
                    [ino] => 14571948
                    [mode] => 33204
                    [nlink] => 1
                    [uid] => 1001
                    [gid] => 1001
                    [rdev] => 0
                    [size] => 745
                    [atime] => 1775692685
                    [mtime] => 1774894793
                    [ctime] => 1774894793
                    [blksize] => 4096
                    [blocks] => 8
                )

            [du] => 4096
            [uid] => 1001
            [gid] => 1001
            [filetype] => file
            [mimetype] => text/x-php
            [dirname] => ../code
            [basename] => str_split.php
            [ext] => php
            [owner] => 
        )

)

Quite a change!
Example 6 listing the files as per example 1, but return them sorted. 
$files = preg_find('/./', '../code', PREG_FIND_SORTKEYS);
foreach($files as $file) printf("<br>%s\n", $file);
Output:
../code/200501152253
../code/404.php
../code/404.phps
../code/argparse.php
../code/array_unique_recursive.php
../code/array_unique_recursive.phps
../code/bcceil.php
../code/code_debug_timing.php
../code/days_of_year.php
../code/dirlister.php
../code/dirlister.phps
../code/dominicsayers.php
../code/foo.php
../code/ftruncate.php
../code/hexstr.php
../code/hexstr.phps
../code/maillog.phps
../code/morse.php
../code/morse.phps
../code/number_to_words.php
../code/number_to_words.phps
../code/number_to_words_apathy.php
../code/number_to_words_ex.php
../code/number_to_words_ex.phps
../code/parse_str_quoted.inc.php
../code/rc4.inc.asp
../code/rc4.inc.php
../code/rc4.inc.phps
../code/rc4.php
../code/rc4.phps
../code/recursive_readdir.php
../code/recursive_readdir.phps
../code/runtimer.php
../code/runtimer.phps
../code/showvalidemail.php
../code/showvalidemail.php.txt
../code/showvalidemail2.php
../code/showvalidemail3.php
../code/showvalidemail4.php
../code/single_astmatch.php
../code/str_case.php
../code/str_case.phps
../code/str_rotN.php
../code/str_split.php
../code/str_split.phps
../code/strnpos.php
../code/strnpos.phps
../code/tail-10.php
../code/tail-10.phps
../code/tail-f.php
../code/tail-f.phps
../code/tlds-alpha-by-domain.txt
../code/validate_email.inc.phps
../code/validate_email.inc.phps.bak
../code/wordwrap_bigwords.php
../code/wordwrap_bigwords.phps
Example 7 listing the files as per example 7, but return them sorted in reverse. 
$files = preg_find('/./', '../code', PREG_FIND_SORTKEYS|PREG_FIND_SORTDESC);
foreach($files as $file) printf("<br>%s\n", $file);
Output:
../code/wordwrap_bigwords.phps
../code/wordwrap_bigwords.php
../code/validate_email.inc.phps.bak
../code/validate_email.inc.phps
../code/tlds-alpha-by-domain.txt
../code/tail-f.phps
../code/tail-f.php
../code/tail-10.phps
../code/tail-10.php
../code/strnpos.phps
../code/strnpos.php
../code/str_split.phps
../code/str_split.php
../code/str_rotN.php
../code/str_case.phps
../code/str_case.php
../code/single_astmatch.php
../code/showvalidemail4.php
../code/showvalidemail3.php
../code/showvalidemail2.php
../code/showvalidemail.php.txt
../code/showvalidemail.php
../code/runtimer.phps
../code/runtimer.php
../code/recursive_readdir.phps
../code/recursive_readdir.php
../code/rc4.phps
../code/rc4.php
../code/rc4.inc.phps
../code/rc4.inc.php
../code/rc4.inc.asp
../code/parse_str_quoted.inc.php
../code/number_to_words_ex.phps
../code/number_to_words_ex.php
../code/number_to_words_apathy.php
../code/number_to_words.phps
../code/number_to_words.php
../code/morse.phps
../code/morse.php
../code/maillog.phps
../code/hexstr.phps
../code/hexstr.php
../code/ftruncate.php
../code/foo.php
../code/dominicsayers.php
../code/dirlister.phps
../code/dirlister.php
../code/days_of_year.php
../code/code_debug_timing.php
../code/bcceil.php
../code/array_unique_recursive.phps
../code/array_unique_recursive.php
../code/argparse.php
../code/404.phps
../code/404.php
../code/200501152253
Example 8 listing the largest 5 files in our directory structure. 
$files = preg_find('/./', '../code',
  PREG_FIND_RECURSIVE|PREG_FIND_RETURNASSOC|PREG_FIND_SORTFILESIZE|PREG_FIND_SORTDESC);
$i=1;
foreach($files as $file => $stats) {
  printf('<br>%d) %d %s', $i, $stats['stat']['size'], $file);
  $i++;
  if ($i > 5) break;
}
Output:
1) 35552 ../code/showvalidemail4.php
2) 32065 ../code/showvalidemail3.php
3) 31899 ../code/showvalidemail.php.txt
4) 31899 ../code/showvalidemail.php
5) 30667 ../code/showvalidemail2.php
Example 9 listing the 10 newest files in our directory structure. 
$files = preg_find('/./', '../code',
  PREG_FIND_RECURSIVE|PREG_FIND_RETURNASSOC|PREG_FIND_SORTMODIFIED|PREG_FIND_SORTDESC);
$i=1;
foreach($files as $file => $stats) {
  printf('<br>%d) %s - %d bytes - %s', $i,
    date("Y-m-d H:i:s", $stats['stat']['mtime']), $stats['stat']['size'], $file);
  $i++;
  if ($i > 10) break;
}
Output:
1) 2026-03-30 18:19:53 - 676 bytes - ../code/tail-f.phps
2) 2026-03-30 18:19:53 - 10213 bytes - ../code/tlds-alpha-by-domain.txt
3) 2026-03-30 18:19:53 - 31899 bytes - ../code/showvalidemail.php.txt
4) 2026-03-30 18:19:53 - 652 bytes - ../code/str_rotN.php
5) 2026-03-30 18:19:53 - 3155 bytes - ../code/tail-10.php
6) 2026-03-30 18:19:53 - 1963 bytes - ../code/rc4.inc.php
7) 2026-03-30 18:19:53 - 1260 bytes - ../code/strnpos.php
8) 2026-03-30 18:19:53 - 950 bytes - ../code/wordwrap_bigwords.phps
9) 2026-03-30 18:19:53 - 30667 bytes - ../code/showvalidemail2.php
10) 2026-03-30 18:19:53 - 294 bytes - ../code/argparse.php

Files in testdir, recursive: Array
(
    [0] => ../code/testdir/dir3/testfile3
    [1] => ../code/testdir/testfile1
    [2] => ../code/testdir/dir2/testfile2
    [3] => ../code/testdir/dir2/dir2.2/subdir/1/2/3/deepfile
    [4] => ../code/testdir/dir2/dir2.2/testfile4
)


Files, recursive, in date modified order:
1774894793 - 2026-03-30 18:19:53 - ./preg_find_2.3.php
1774894793 - 2026-03-30 18:19:53 - ./preg_find_ex_2.4.php
1774894793 - 2026-03-30 18:19:53 - ./preg_find_2.4.php
1774894793 - 2026-03-30 18:19:53 - ./preg_find_ex_2.3.php
1774894793 - 2026-03-30 18:19:53 - ./preg_find.php
1774894793 - 2026-03-30 18:19:53 - ./preg_find_ex.php
1774894793 - 2026-03-30 18:19:53 - ./old/2.0/preg_find.php
1774894793 - 2026-03-30 18:19:53 - ./old/2.0/preg_find_ex.php
1774894793 - 2026-03-30 18:19:53 - ./old/2.0/preg_find_ex.phps
1774894793 - 2026-03-30 18:19:53 - ./old/2.0/preg_find.phps
1774894793 - 2026-03-30 18:19:53 - ./old/2.2/preg_find.php
1774894793 - 2026-03-30 18:19:53 - ./old/2.3/preg_find.php
1774894793 - 2026-03-30 18:19:53 - ./old/2.1/preg_find.php
1774894793 - 2026-03-30 18:19:53 - ./preg_find_ex.phps
1774894793 - 2026-03-30 18:19:53 - ./cisco.txt
1774894793 - 2026-03-30 18:19:53 - ./.preg_find_2.4.php.swp
1774894793 - 2026-03-30 18:19:53 - ./preg_find.phps
1774894793 - 2026-03-30 18:19:53 - ./preg_find.php.txt


Files in ../code, recursive, in alphabetical order:
Array
(
    [50] => ../code/200501152253
    [56] => ../code/404.php
    [53] => ../code/404.phps
    [9] => ../code/argparse.php
    [11] => ../code/array_unique_recursive.php
    [14] => ../code/array_unique_recursive.phps
    [22] => ../code/bcceil.php
    [36] => ../code/code_debug_timing.php
    [25] => ../code/days_of_year.php
    [47] => ../code/dirlister.php
    [45] => ../code/dirlister.phps
    [48] => ../code/dominicsayers.php
    [38] => ../code/foo.php
    [39] => ../code/ftruncate.php
    [24] => ../code/hexstr.php
    [13] => ../code/hexstr.phps
    [57] => ../code/maillog.phps
    [29] => ../code/morse.php
    [58] => ../code/morse.phps
    [37] => ../code/number_to_words.php
    [34] => ../code/number_to_words.phps
    [30] => ../code/number_to_words_apathy.php
    [51] => ../code/number_to_words_ex.php
    [33] => ../code/number_to_words_ex.phps
    [28] => ../code/parse_str_quoted.inc.php
    [31] => ../code/rc4.inc.asp
    [5] => ../code/rc4.inc.php
    [21] => ../code/rc4.inc.phps
    [40] => ../code/rc4.php
    [41] => ../code/rc4.phps
    [35] => ../code/recursive_readdir.php
    [55] => ../code/recursive_readdir.phps
    [43] => ../code/runtimer.php
    [44] => ../code/runtimer.phps
    [52] => ../code/showvalidemail.php
    [2] => ../code/showvalidemail.php.txt
    [8] => ../code/showvalidemail2.php
    [54] => ../code/showvalidemail3.php
    [49] => ../code/showvalidemail4.php
    [46] => ../code/single_astmatch.php
    [15] => ../code/str_case.php
    [12] => ../code/str_case.phps
    [3] => ../code/str_rotN.php
    [42] => ../code/str_split.php
    [26] => ../code/str_split.phps
    [6] => ../code/strnpos.php
    [27] => ../code/strnpos.phps
    [4] => ../code/tail-10.php
    [23] => ../code/tail-10.phps
    [60] => ../code/tail-f.php
    [0] => ../code/tail-f.phps
    [19] => ../code/testdir/dir2/dir2.2/subdir/1/2/3/deepfile
    [20] => ../code/testdir/dir2/dir2.2/testfile4
    [18] => ../code/testdir/dir2/testfile2
    [16] => ../code/testdir/dir3/testfile3
    [17] => ../code/testdir/testfile1
    [1] => ../code/tlds-alpha-by-domain.txt
    [59] => ../code/validate_email.inc.phps
    [10] => ../code/validate_email.inc.phps.bak
    [32] => ../code/wordwrap_bigwords.php
    [7] => ../code/wordwrap_bigwords.phps
)


Files in ../code, recursive, in alphabetical order on file basename:
Array
(
    [0] => ../code/200501152253
    [1] => ../code/404.php
    [2] => ../code/404.phps
    [3] => ../code/argparse.php
    [4] => ../code/array_unique_recursive.php
    [5] => ../code/array_unique_recursive.phps
    [6] => ../code/bcceil.php
    [7] => ../code/code_debug_timing.php
    [8] => ../code/days_of_year.php
    [9] => ../code/testdir/dir2/dir2.2/subdir/1/2/3/deepfile
    [10] => ../code/dirlister.php
    [11] => ../code/dirlister.phps
    [12] => ../code/dominicsayers.php
    [13] => ../code/foo.php
    [14] => ../code/ftruncate.php
    [15] => ../code/hexstr.php
    [16] => ../code/hexstr.phps
    [17] => ../code/maillog.phps
    [18] => ../code/morse.php
    [19] => ../code/morse.phps
    [20] => ../code/number_to_words.php
    [21] => ../code/number_to_words.phps
    [22] => ../code/number_to_words_apathy.php
    [23] => ../code/number_to_words_ex.php
    [24] => ../code/number_to_words_ex.phps
    [25] => ../code/parse_str_quoted.inc.php
    [26] => ../code/rc4.inc.asp
    [27] => ../code/rc4.inc.php
    [28] => ../code/rc4.inc.phps
    [29] => ../code/rc4.php
    [30] => ../code/rc4.phps
    [31] => ../code/recursive_readdir.php
    [32] => ../code/recursive_readdir.phps
    [33] => ../code/runtimer.php
    [34] => ../code/runtimer.phps
    [35] => ../code/showvalidemail.php
    [36] => ../code/showvalidemail.php.txt
    [37] => ../code/showvalidemail2.php
    [38] => ../code/showvalidemail3.php
    [39] => ../code/showvalidemail4.php
    [40] => ../code/single_astmatch.php
    [41] => ../code/str_case.php
    [42] => ../code/str_case.phps
    [43] => ../code/str_rotN.php
    [44] => ../code/str_split.php
    [45] => ../code/str_split.phps
    [46] => ../code/strnpos.php
    [47] => ../code/strnpos.phps
    [48] => ../code/tail-10.php
    [49] => ../code/tail-10.phps
    [50] => ../code/tail-f.php
    [51] => ../code/tail-f.phps
    [52] => ../code/testdir/testfile1
    [53] => ../code/testdir/dir2/testfile2
    [54] => ../code/testdir/dir3/testfile3
    [55] => ../code/testdir/dir2/dir2.2/testfile4
    [56] => ../code/tlds-alpha-by-domain.txt
    [57] => ../code/validate_email.inc.phps
    [58] => ../code/validate_email.inc.phps.bak
    [59] => ../code/wordwrap_bigwords.php
    [60] => ../code/wordwrap_bigwords.phps
)


Files in ../code, recursive, in reverse file size order:
35552 bytes - 2026-03-30 18:19:53 - ../code/showvalidemail4.php
32065 bytes - 2026-03-30 18:19:53 - ../code/showvalidemail3.php
31899 bytes - 2026-03-30 18:19:53 - ../code/showvalidemail.php.txt
31899 bytes - 2026-03-30 18:19:53 - ../code/showvalidemail.php
30667 bytes - 2026-03-30 18:19:53 - ../code/showvalidemail2.php
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