mysql - how to read/decipher a user defined mathematical formula and perform requested operation in php -


i have user defined formula stored in mysql table avg({arrival_date}-{departure_date}) managed items arrival_date , departure_date select rows separate table.

how can replace {arrival_date} , {departure_date} avg({arrival_date}-{departure_date}) actual data selected database table?

hi suggestion. solved above using https://github.com/jlawrence11/eos. there no need of trying decipher formula long follows bodmas rule.

you read formula defined, pass values(numbers or floats) formula , call eos computation.

example: 

  <?php        $formula_as_defined = avg({arrival_date}-{departure_date})  ; //get formula database        $str= str_ireplace('{','',$formula_as_defined);       $mod_str= str_ireplace('}','',$str);       $mod_str;       //  foreach($sql_select_resultset $array) //this array of values selected db table #1 => arrival_date #2 =>departure_date               {                   foreach($array $key => $value)                   {                       $col_mod[]= $key;                        $val_mod[]= strtotime($value);                       //                   }                     $char_mod = str_ireplace($col_mod,$val_mod,$mod_str);                     unset($col_mod);                     unset($val_mod);                     //                   //   $equation = "(".strtotime('13-07-2015')."-".strtotime('20-07-2015').")";                      $equation = $char_mod  ;                      $eq = new eqeos();                      $result = $eq->solveif($equation); //pass formula solveif , done.                      //                      $myresults = $this->groupdata($myresults,$array,$x_axis_column,$results_type_time);                      array_push($myresults[date('m',strtotime($array[$x_axis_column]))],$result);                }      ?>

Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

Rendering JButton to get the JCheckBox behavior in a JTable by using images does not update my table -

i rendering jbutton image on simulate jcheckbox behavior. why don't let jtable render jcheckbox? because need bigger checkboxes , there's no way can resize them (as far know). so, have own table cell renderer , editor. both renders jbutton , checkbox images on them. trying change image checked image unchecked image (or vice versa) , update cell value (boolean true or false). however, reason, getcelleditorvalue() not update table. so, release mouse, value goes original one. any appreciated! lot! public class tableexample extends jframe { jscrollpane pane; jpanel panel; jtable table; object[][] data; mytablemodel tm; renderer buttoncolumn; public tableexample(object[][] data) throws ioexception { string[] columns = {"column#1", "column#2", "column#3", "column#4", "column#5", "column#6"}; this.data = data; this.setpreferredsize(new dimension(700, 500));
Read more