Chapter 6. Basic detection

Table of Contents

Detection of a single file
Detection of a directory

Detection of a single file

In most case, the basic detection is enough. But sometimes, we will need to adjust accuracy of parser to give the best result. It is possible with $option, the second parameter of each parser method. See parser options list for details.

Suppose we have to detect which PHP version we need to run this script named "math.php"

<?php
$nb = bcsub(1.234, 5, 4);
if (preg_match('/^-/', $nb)) {
echo 'minus';
}
?>

We will use this very simple detection script.

<?php
require_once 'PHP/CompatInfo.php';
$source = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'math.php';
$info = new PHP_CompatInfo();
$info->parseFile($source);
// you may also use unified method: $info->parseData($source);
?>

Default output used the Array renderer (we will talk about it and other renderers later; don't be afraid if you don't know what is it yet). Here are the raw results we got on standard output :

array (
  'ignored_files' =>
  array (
  ),
  'ignored_functions' =>
  array (
  ),
  'ignored_extensions' =>
  array (
  ),
  'ignored_constants' =>
  array (
  ),
  'max_version' => '',
  'version' => '4.0.0',
  'extensions' =>
  array (
    0 => 'bcmath',
    1 => 'pcre',
  ),
  'constants' =>
  array (
  ),
  'tokens' =>
  array (
  ),
  'cond_code' =>
  array (
    0 => 0,
  ),
)

It means that we need at least PHP 4.0.0 to run the "math.php" script. with two PHP extensions bcmath, pcre loaded.

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PHP_CompatInfo : The Definitive Guide

Chapter 6. Basic detection

Detection of a single file