Calc Plugin

• Lil calculator.
• All the PHP math functions and constants are allowed.
• French and English. Easy to add your own language.

• calc:[your_math_expression]= → result
• calc:[your_math_expression]>= → your_math_expression = result

• calc:2+3*5= → 17
• calc:-1234.56*78.9= → -9,629.568
• calc:sin(pi()/4)= → 0.707106781187
• calc:round(exp(1),3)= → 2.718
• calc:(1+sqrt(5))/2= → 1.61803398875

• You can display the expression before the result adding a ”>” before the ”=”
  • calc:2+3*5>= → 2+3*5 = 17

• The plugin handles errors
  • calc:5/0= → “Calc error: Division by zero”
  • calc:sqrt(-1)= → “Bad value…”
  • calc:unauthorized_function(12)= → “Calc error: syntax error, unexpected ';'”

• You can customize your decimal and thousand separators in the lang/xx/lang.php file (xx is your language code: fr, en…).
• A comment is added in the source code of the page before the calculation: you can see what expression has really been processed by the plugin.
• You can also use this plugin to format a single number. Ex: calc:1234567890= → 1,234,567,890.

• This plugin uses the PHP eval() function, but it removes all functions that are not mathematical functions before doing the eval().
• It also removes every ”;” and “$” char before doing the evaluation.

• Tell me if you see a security break using this plugin.

• 2008-09-08: first one!
• 2008-09-10: doesn't try to format string results (like those sent by base_convert)
• 2008-09-11: prevents XSS

• Tell me…

I dreamed about it, and you made it. Thank you so much ! fab

You're welcome

I get an error: Parse error: syntax error, unexpected '{' in /dokuwiki/lib/plugins/calc/syntax.php on line 118

Works like a charm. Thank you so much. Henning