There is a string of format
2a*3b+100 and 2 numbers
You need to break it down into elements and perform the actions that are indicated in the line. I wanted to do it through
miltiexplode(array("+","-","*","/"), $string) , but in this case the signs are lost. Probably need to iterate over the elements, but I don't see a good way. Yes, and I have difficulties with strings.
2*a*3*b i.e. so explode won't work. here you can dribble towards eval, convert a string to php like and execute for example
$formualPHP = '$a='.$youNamberA.';'; // это $a=2; $formualPHP .= '$b='.$youNamberB.';'; // это $b=3; $formulaPHP .= 'return '.str_replace(array('a','b'),array('*$a','*$b'),$formula); // $a=2;$b=3; return 2*$a*3*$b+100; $result = eval($formulaPHP); var_dump($result);
But you have to be careful with eval () if the numbers can be user defined i.e. taken from get, post, etc. sources.