RuntimeEnvironment.inc.php

<?php
class RuntimeEnvironment {
   var $_phpVersionMin;
 
   var $_phpVersionMax;
 
   var $_phpExtensions;
 
   var $_externalPrograms;
 
   function __construct($phpVersionMin = PHP_REQUIRED_VERSION, $phpVersionMax = null, $phpExtensions = array(), $externalPrograms = array()) {
      $this->_phpVersionMin = $phpVersionMin;
      $this->_phpVersionMax = $phpVersionMax;
      $this->_phpExtensions = $phpExtensions;
      $this->_externalPrograms = $externalPrograms;
   }
 
   //
   // Setters and Getters
   //
   function getPhpVersionMin() {
      return $this->_phpVersionMin;
   }
 
   function getPhpVersionMax() {
      return $this->_phpVersionMax;
   }
 
   function getPhpExtensions() {
      return $this->_phpExtensions;
   }
 
   function getExternalPrograms() {
      return $this->_externalPrograms;
   }
 
 
   //
   // Public methods
   //
   function isCompatible() {
      // Check PHP version
      if (!is_null($this->_phpVersionMin) && !checkPhpVersion($this->_phpVersionMin)) return false;
      if (!is_null($this->_phpVersionMax) && version_compare(PHP_VERSION, $this->_phpVersionMax) === 1) return false;
 
      // Check PHP extensions
      foreach($this->_phpExtensions as $requiredExtension) {
         if(!extension_loaded($requiredExtension)) return false;
      }
 
      // Check external programs
      foreach($this->_externalPrograms as $requiredProgram) {
         $externalProgram = Config::getVar('cli', $requiredProgram);
         if (!file_exists($externalProgram)) return false;
         if (function_exists('is_executable')) {
            if (!is_executable($externalProgram)) return false;
         }
      }
 
      // Compatibility check was successful
      return true;
   }
}