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@ 2018-08-09T08:52:21Z

<?php

class Foo
{
    public function createFunction($formula, $args)
    {
        $func = function ($args) use ($formula) {
            foreach ($args as $key => $val) {
                $$key = $val;
            }
            return eval($formula);
        };
        return $func($args);
    }
}

$foo = new Foo;

$formula = <<<'EOT'
if($a == 'some_value' || $c == 'other_value') {
    return 'something';
} else if($b == 'something' && $d == 'anything') {
    return 'something_else';
} else {
    return 'anything';
}
EOT;

echo $foo->createFunction($formula, ['a' => 'some_value', 'b' => '', 'c' => 'other_value', 'd' => 'anything']);
echo "\n";
echo $foo->createFunction($formula, ['a' => '', 'b' => 'something', 'c' => '', 'd' => 'anything']);
echo "\n";
echo $foo->createFunction($formula, ['a' => '', 'b' => '', 'c' => '', 'd' => '']);

Output for git.master_jit, git.master, rfc.property-hooks: something something_else anything

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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