PHP calculation based on the array values

Question

I'm trying to create a calculation based on the values of the array - imagine the following array:

$values = array(9, +, 10, *, 7)

I thought about the following approach:

$result = number_format(implode(' ', $values), 2)

but this obviously doesn't work.

Any idea how could this be achieved?

possible duplicate of PHP Maths Equation Function

RaYell
– RaYell

2011-12-12 11:46:47 +00:00
Commented Dec 12, 2011 at 11:46 — RaYell
– RaYell, Commented Dec 12, 2011 at 11:46

alex · Accepted Answer · 2011-12-12 12:36:43Z

2

You could use eval()...

eval('$result = ' . implode($values) . ';');

If any portion of this array came from user input, you should filter the array to ensure it only has numbers and valid operators.

$safeValues = array_filter($values, function($value) {
    return is_numeric($value) OR in_array($value, array('+', '-', '/', '*'));
});

edited Dec 12, 2011 at 12:36

answered Dec 12, 2011 at 11:45

alex

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5 Comments

Jay Gilford Over a year ago

agreed, although depending on your hosting this may be restricted. If you can't use the eval method, you're likely going to need to create a math parser, or find a library that will do so

mishu Over a year ago

or something like eval('$result = ' . implode($values) . ';'); since eval returns null usually.. and the expression does not return something, so you need to assign the result in the variable inside the eval call

alex Over a year ago

@mishu Thanks, I haven't used PHP in a little while :)

mishu Over a year ago

@alex you are welcome.. it was just a small note, I think everyone got the idea.. as this one: you might want to add a semicolon also at the end of the line (just after implode) :)

alex Over a year ago

@mishu I'm hopeless tonight :P Thanks.

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