$eqAbbrev $affe");
$affe -= 1;
}
}
}
function tex($label, $texFormula) {
//variables
global $ImgCacheUrl, $eqCount, $eqArray;
// put the label into the array that holds all the labels ... :) ... god, that sounds stupid
// increment the label counter
$label = trim($label);
$eqArray[$eqCount] = $label;
$eqCount++;
// create image name based on md5-sum of latex expression
$imgN = md5($texFormula).".png";
$texFormula = trim($texFormula);
makePng($texFormula, $imgN);
// write html
return Keep("![\"$texFormula\"](\"$ImgCacheUrl/$imgN\")
($eqCount)");
}
function inline($texString) {
// variables
global $ImgCacheUrl;
// create image name based on md5-sum of latex expression
$imgN = md5($texString).".png";
$texString = trim($texString);
makePng($texString, $imgN);
// write html
return Keep("");
}
// clean work.* stuff out off latex dir
function cleanUp($patternStr) {
foreach(glob($patternStr) as $fn) {
unlink($fn);
}
}
// create png
function makePng($tex, $imgname) {
global $dvipngPath,$latexPath, $ImgCacheDir;
$tex = str_replace('$','\$',$tex); # Prevent user from leaving math mode
$tex = str_replace('/','\slash{}',$tex); # Prevent user from open files...
$tex = preg_replace('/{([^ ]+})/','{\nothing{}$1',$tex); # Obvuscate potential filenames
// template for tex file
$texString = "\documentclass[a4paper,12pt]{article}
\\newcommand{\\nothing}{}
\\pagestyle{empty}
\\begin{document}
$$tex$
\\end{document}";
// check if image already exists, if not create it
if (!file_exists("$ImgCacheDir/$imgname")) {
// create tex template
touch("$ImgCacheDir/work.tex");
if ($fp = fopen("$ImgCacheDir/work.tex", "w+")) {
fwrite($fp,$texString);
//create dvi
exec("cd $ImgCacheDir && $latexPath work.tex");
// create png
exec("cd $ImgCacheDir && $dvipngPath -T tight -bg Transparent -D 100 -o $imgname work.dvi");
fclose($fp);
// clean up
cleanUp("$ImgCacheDir/work.*");
}
else {
echo "something has gone wrong, do you have correct permissions to $ImgCacheDir";
}
}
}
?>