Since PHP create_function got deprecated as of PHP v7.2, we can no longer use that function to evaluate math string in the quickest way. I have created a very simple PHP function that can evaluate math strings without any other dependencies.
Please check test.php
| Input | Output |
|---|---|
| -3 | -3 |
| +5 | 5 |
| 5+2 | 7 |
| -5-1 | -6 |
| 5-1 | 4 |
| 2 + 2.5 + 3 / 3 + 3 * 3 | 14.5 |
| 5 + 10 /-2 - 5 *2 | -10 |
| ((5 - 2.5) + 2) * ((5 - 2.5) + 2) | 20.25 |
| (((5 - 2.5) + 2) * ( 10 / 5)) | 9 |
| 5-(-2) | 7 |
Please be noted that for the sake of simplicity, this function will not raise any errors in the case of the syntax problem. It will simply end up with zero or an ambiguous output. You must provide a valid syntax to get the correct result.