PHP_CompatInfo : The Definitive Guide

If you read analogous Basic detection chapter, you have certainly noticed that detection of HTML_AJAX 0.5.0 distribution directories gave result PHP 5.0.0. We expect to have PHP minimum 4.2.1

Why such version. If we have a look on basic raw result (array) we could found two files with version 5.0.0 : The first one is

["c:\pear\html\HTML_Ajax-0.5.0\examples\support\xml.class.php"]=>
  array(4) {
    ["max_version"]=>
    string(0) ""
    ["version"]=>
    string(5) "5.0.0"
    ["extensions"]=>
    array(1) {
      [0]=>
      string(6) "domxml"
    }
    ["constants"]=>
    array(0) {
    }
  }
     

If you have a cursory source review, you will see that this file is an alternative to PHP 4 Dom XML extension with new native PHP 5 class DOMDocument.

The second file is :

 ["c:\pear\html\HTML_Ajax-0.5.0\AJAX.php"]=>
  array(4) {
    ["max_version"]=>
    string(0) ""
    ["version"]=>
    string(5) "5.0.0"
    ["extensions"]=>
    array(3) {
      [0]=>
      string(4) "pcre"
      [1]=>
      string(4) "curl"
      [2]=>
      string(7) "sockets"
    }
    ["constants"]=>
    array(0) {
    }
  }
     

If you have a cursory source review, you will find easily condition code switch around PHP 5 native functions set_exception_handler, and restore_exception_handler.

Even with these two fixes, PHP_CompatInfo still give wrong results. If we continue to check files list, we will find an example script "C:\PEAR\HTML\HTML_AJAX-0.5.0\examples\support\xml.class.php" with native file_get_contents (came with PHP version 4.3.0).

and the main class file (AJAX.php) with two native PHP 4.3.0 functions file_get_contents, and stream_context_create. But to run this chunk of code you need at least PHP 5.0.0, see if-condition few lines backward with version_compare.

Here is now the full detection script.

And a chunk of raw results we got :

array(60) {
  ["ignored_files"]=>
  array(1) {
    [0]=>
    string(59) "c:\pear\html\HTML_Ajax-0.5.0\examples\support\xml.class.php"
  }
  ["max_version"]=>
  string(0) ""
  ["version"]=>
  string(5) "4.2.1"
  ["extensions"]=>
  array(6) {
    [0]=>
    string(8) "mbstring"
    [1]=>
    string(4) "pcre"
    [2]=>
    string(6) "domxml"
    [3]=>
    string(4) "curl"
    [4]=>
    string(7) "sockets"
    [5]=>
    string(7) "session"
  }
  ["constants"]=>
  array(1) {
    [0]=>
    string(8) "__FILE__"
  }

  [... more ...]

}
     

It means that we need at least PHP 4.2.1 to run HTML_Ajax 0.5.0 with PHP extensions mbstring, pcre, domxml, curl, sockets, session loaded.

If we try again to detect the same distribution untar directory, the command to run will be:

pcicmd -d c:\pear\html\HTML_Ajax-0.5.0
       -in \wamp\www\pci\functions.txt
     

And chunk of results give:

+----------------------------------+---------+------------+------------------+
| Path                             | Version | Extensions | Constants/Tokens |
+----------------------------------+---------+------------+------------------+
| [...]\*                          | 4.2.1   | mbstring   | __FILE__         |
|                                  |         | pcre       |                  |
|                                  |         | domxml     |                  |
|                                  |         | curl       |                  |
|                                  |         | sockets    |                  |
|                                  |         | session    |                  |
+----------------------------------+---------+------------+------------------+
| [...]\examples\xml_usage.php     | 3.0.0   |            |                  |
+----------------------------------+---------+------------+------------------+
| [...]\examples\xmlserver.php     | 3.0.0   |            |                  |
+----------------------------------+---------+------------+------------------+
| [...]\examples\tests\        (+) | 3.0.0   |            |                  |
| test_speed.php                   |         |            |                  |
+----------------------------------+---------+------------+------------------+

[... more ...]

+----------------------------------+---------+------------+------------------+
| [...]\AJAX\Action.php            | 4.0.4   |            |                  |
+----------------------------------+---------+------------+------------------+