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The preferred way to install this extension is through Composer.
Either run
php composer.phar require dykyi-roman/math-parser "dev-master"
or add
"dykyi-roman/math-parser": "master"
to the require section of your composer.json
$mp = new mathParser();
$result = $mp->calc("1+2-(2*2)");
Dykyi Roman, e-mail: mr.dukuy@gmail.com