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See Release Notes

  • Bug fixes for general core bugs in 3.11.x will end 14 Nov 2022 (12 months plus 6 months extension).
  • Bug fixes for security issues in 3.11.x will end 13 Nov 2023 (18 months plus 12 months extension).
  • PHP version: minimum PHP 7.3.0 Note: minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is supported too.
<?php
      // This function fetches math. images from the data directory
      // If not, it obtains the corresponding TeX expression from the cache_tex db table
      // and uses mimeTeX to create the image file

// disable moodle specific debug messages and any errors in output
define('NO_DEBUG_DISPLAY', true);
define('NO_MOODLE_COOKIES', true); // Because it interferes with caching

    require_once('../../config.php');

    if (!filter_is_enabled('algebra')) {
< print_error('filternotenabled');
> throw new \moodle_exception('filternotenabled');
} require_once($CFG->libdir.'/filelib.php'); require_once($CFG->dirroot.'/filter/tex/lib.php'); $cmd = ''; // Initialise these variables $status = ''; $relativepath = get_file_argument(); $args = explode('/', trim($relativepath, '/')); if (count($args) == 1) { $image = $args[0]; $pathname = $CFG->dataroot.'/filter/algebra/'.$image; } else {
< print_error('invalidarguments', 'error');
> throw new \moodle_exception('invalidarguments', 'error');
} if (!file_exists($pathname)) { $md5 = str_replace('.gif','',$image); if ($texcache = $DB->get_record('cache_filters', array('filter'=>'algebra', 'md5key'=>$md5))) { if (!file_exists($CFG->dataroot.'/filter/algebra')) { make_upload_directory('filter/algebra'); } $texexp = $texcache->rawtext; $texexp = str_replace('&lt;','<',$texexp); $texexp = str_replace('&gt;','>',$texexp); $texexp = preg_replace('!\r\n?!',' ',$texexp); $texexp = '\Large ' . $texexp; $cmd = filter_tex_get_cmd($pathname, $texexp); system($cmd, $status); } } if (file_exists($pathname)) { send_file($pathname, $image); } else { if (debugging()) { echo "The shell command<br />$cmd<br />returned status = $status<br />\n"; echo "Image not found!<br />"; echo "Please try the <a href=\"$CFG->wwwroot/filter/algebra/algebradebug.php\">debugging script</a>"; } else { echo "Image not found!<br />"; echo "Please try the <a href=\"$CFG->wwwroot/filter/algebra/algebradebug.php\">debugging script</a><br />"; echo "Please turn on debug mode in site configuration to see more info here."; } }