lib/phpminimumversionlib.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 // MOODLE_INTERNAL check intentionally missing to allow this to be used more widely!
  18
  19 /**
  20  * A set of PHP-compatible convenience functions to check Moodle minimum PHP version in
  21  * a unified place.
  22  *
  23  * PLEASE NOTE: This file is made to be both php-version compatible and without requirement on
  24  * any moodle functions or installation so it can be used in installer or incompatible PHP versions.
  25  *
  26  * @package    core
  27  * @copyright  2017 Dan Poltawski <dan@moodle.com>
  28  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  29  */
  30
  31 /**
  32  * Require our minimum php version or halt execution if requirement not met.
  33  * @return void Execution is halted if version is not met.
  34  */
  35 function moodle_require_minimum_php_version() {
  36     // PLEASE NOTE THIS FUNCTION MUST BE COMPATIBLE WITH OLD UNSUPPORTED VERSIONS OF PHP!
  37     moodle_minimum_php_version_is_met(true);
  38 }
  39
  40 /**
  41  * Tests the current PHP version against Moodle's minimum requirement. When requirement
  42  * is not met returns false or halts execution depending $haltexecution param.
  43  *
  44  * @param bool $haltexecution Should execution be halted when requirement not met? Defaults to false.
  45  * @return bool returns true if requirement is met (false if not)
  46  */
  47 function moodle_minimum_php_version_is_met($haltexecution = false) {
  48     // PLEASE NOTE THIS FUNCTION MUST BE COMPATIBLE WITH OLD UNSUPPORTED VERSIONS OF PHP.
  49     // Do not use modern php features or Moodle convenience functions (e.g. localised strings).
  50
  51     $minimumversion = '7.0.0';
  52     $moodlerequirementchanged = '3.4';
  53
  54     if (version_compare(PHP_VERSION, $minimumversion) < 0) {
  55         if ($haltexecution) {
  56             $error = "Moodle ${moodlerequirementchanged} or later requires at least PHP ${minimumversion} "
  57                 . "(currently using version " . PHP_VERSION .").\n"
  58                 . "Some servers may have multiple PHP versions installed, are you using the correct executable?\n";
  59
  60             // Our CLI scripts define CLI_SCRIPT before running this test, so make use of
  61             // to send error on STDERR.
  62             if (defined('CLI_SCRIPT') && defined('STDERR')) {
  63                 fwrite(STDERR, $error);
  64             } else {
  65                 echo $error;
  66             }
  67             exit(1);
  68         } else {
  69             return false;
  70         }
  71     }
  72     return true;
  73 }
  74
  75 // DO NOT ADD EXTRA FUNCTIONS TO THIS FILE!!
  76 // This file must be functioning on all versions of PHP, extra functions belong elsewhere.