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编辑当前文件:/home2/sdektunc/www/cepali/filter/algebra/pix.php

<?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');
    }

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');
    }

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;
 $texexp = str_replace('<','<',$texexp);
 $texexp = str_replace('>','>',$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 $cmd returned status = $status \n";
 echo "Image not found! ";
 echo "Please try the <a href=\"$CFG->wwwroot/filter/algebra/algebradebug.php\">debugging script</a>";
 } else {
 echo "Image not found! ";
 echo "Please try the <a href=\"$CFG->wwwroot/filter/algebra/algebradebug.php\">debugging script</a> ";
 echo "Please turn on debug mode in site configuration to see more info here.";
 }
 }