Unknown constant i

[maximl337]

        $expression = 'a + i';
        $variableValues = ['a' => 1, 'i' => 1];
        // Generate an abstract syntax tree
        $AST = $this->parser->parse($expression);

        // Set variables with value ['x' => 1, ..]
        $this->evaluator->setVariables($variableValues);

        // pass evaluator to Abstract Syntax Tree
        $value = $AST->accept($this->evaluator);
        
        return $value;

Any expression that contains i seems the throw the following expception:

MathParser\Exceptions\UnknownConstantException: Unknown constant i.

Replacing i with any other alphabet seems to fix the issue.

[mossadal]

i is reserved as the imaginary unit. If you want to use i as a regular variable, you can replace StdMathLexer with a version that doesn't recognize i. (Remove line 129.)

[mossadal]

Actually, I had a closer look, and i shouldn't be reserved in StdMathLexer, just in ComplexLexer. An update is on its way.

[mossadal]

This is now fixed in 1.3.15