PHP code example of hoa / math

1. Go to this page and download the library: Download hoa/math library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php.

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

hoa / math example snippets


// 1. Load the compiler.
$compiler = Hoa\Compiler\Llk::load(
    new Hoa\File\Read('hoa://Library/Math/Arithmetic.pp')
);

// 2. Load the visitor, aka the “evaluator”.
$visitor    = new Hoa\Math\Visitor\Arithmetic();

// 3. Declare the expression.
$expression = '1 / 2 / 3 + 4 * (5 * 2 - 6) * PI / avg(7, 8, 9)';

// 4. Parse the expression.
$ast        = $compiler->parse($expression);

// 5. Evaluate.
var_dump(
    $visitor->visit($ast)
);

/**
 * Will output:
 *     float(6.4498519738463)
 */

// Bonus. Print the AST of the expression.
$dump = new Hoa\Compiler\Visitor\Dump();
echo $dump->visit($ast);

/**
 * Will output:
 *     >  #addition
 *     >  >  #division
 *     >  >  >  token(number, 1)
 *     >  >  >  #division
 *     >  >  >  >  token(number, 2)
 *     >  >  >  >  token(number, 3)
 *     >  >  #multiplication
 *     >  >  >  token(number, 4)
 *     >  >  >  #multiplication
 *     >  >  >  >  #group
 *     >  >  >  >  >  #substraction
 *     >  >  >  >  >  >  #multiplication
 *     >  >  >  >  >  >  >  token(number, 5)
 *     >  >  >  >  >  >  >  token(number, 2)
 *     >  >  >  >  >  >  token(number, 6)
 *     >  >  >  >  #division
 *     >  >  >  >  >  token(constant, PI)
 *     >  >  >  >  >  #function
 *     >  >  >  >  >  >  token(id, avg)
 *     >  >  >  >  >  >  token(number, 7)
 *     >  >  >  >  >  >  token(number, 8)
 *     >  >  >  >  >  >  token(number, 9)
 */


$visitor->addFunction('rand', function ($min, $max) {
    return mt_rand($min, $max);
});
$visitor->addConstant('ANSWER', 42);

$expression = 'rand(ANSWER / 2, ANSWER * 2)'
var_dump(
    $visitor->visit($compiler->parse($expression))
);

/**
 * Could output:
 *     int(53)
 */