Detecting negative numbers

Question

I was wondering if there is any way to detect if a number is negative in PHP   I have the following code    profitloss    result- gt date sold price -  result- gt date bought price    I need to find out if  profitloss is negative and if it is  I need to echo out that it is

User · Answer

I assume that the main idea is to find if number is negative and display it in correct format.

For those who use PHP5.3 might be interested in using Number Formatter Class - http://php.net/manual/en/class.numberformatter.php. This function, as well as range of other useful things, can format your number.

$profitLoss = 25000 - 55000;

$a= new \NumberFormatter("en-UK", \NumberFormatter::CURRENCY); 
$a->formatCurrency($profitLoss, 'EUR');
// would display (€30,000.00)

Here also a reference to why brackets are used for negative numbers: http://www.open.edu/openlearn/money-management/introduction-bookkeeping-and-accounting/content-section-1.7

User · Answer

if    profitloss  lt  0        echo  negative

User · Answer

You could check if  profitloss  lt  0  if   profitloss  lt  0       echo  Less than 0 n   endif

User · Answer

if   profitloss  lt  0       echo  The profitloss is negative       Edit  I feel like this was too simple an answer for the rep so here s something that you may also find helpful   In PHP we can find the absolute value of an integer by using the abs   function  For example if I were trying to work out the difference between two figures I could do this    turnover   10000   overheads   12500    difference   abs  turnover- overheads    echo  The Difference is    difference    This would produce The Difference is 2500

User · Answer

You could use a ternary operator like this one  to make it a one liner   echo   profitloss  lt  0     false     true

User · Answer

Just multiply the number by -1 and check if the result is positive

User · Answer

I believe this is what you were looking for   class Expression       protected  expression      protected  result       public function   construct  expression             this- gt expression    expression             public function evaluate              this- gt result   eval  return    this- gt expression               return  this             public function getResult             return  this- gt result           class NegativeFinder       protected  expressionObj       public function   construct Expression  expressionObj             this- gt expressionObj    expressionObj             public function isItNegative              result    this- gt expressionObj- gt evaluate  - gt getResult             if  this- gt hasMinusSign  result                 return true            else               return false                       protected function hasMinusSign  value            return  substr strval  value   0  1      -              Usage    soldPrice   1   boughtPrice   2   negativeFinderObj   new NegativeFinder new Expression   soldPrice -  boughtPrice      echo   negativeFinderObj- gt isItNegative       It is negative      It is not negative        Do however note that eval is a dangerous function  therefore use it only if you really  really need to find out if a number is negative    -

User · Answer

Can be easily achieved with a ternary operator   is negative    profitloss  lt  0   true   false

User · Answer

Don t get me wrong  but you can do this way     function nagitive check  value   if  isset  value        if  substr strval  value   0  1      -        return  It is negative lt br gt      else       return  It is not negative  lt br gt                Output   echo nagitive check -100       It is negative echo nagitive check 200       It is not negative  echo nagitive check 200-300       It is negative echo nagitive check 200-300 1000       It is not negative

User · Answer

if x  lt  0  if abs x     x  if substr strval x   0  1      -

[php] Detecting negative numbers

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