CoreGradeWeb/app/Models/MathsModel.php

<?php

namespace App\Model;
use CodeIgniter\Model;

class MathsModel extends Model
{


    protected function initialize()
    {
        parent::initialize(); // TODO: Change the autogenerated stub
    }

    public function PageData($printableCode){

        // Check if function is available first
        return $this->$printableCode();
    }

    private function SIMULTAN1(){
        $data = [];
        for ($ii = 0; $ii < 50; $ii++) {

            $la1 = array("x","a","p","r","q","s");  // your choice for variale name
            $la2 = array("y","z","n","m","u","f");  // your choice for variale name different from list la1

            $let1 = $la1[rand(0,5)]; // pick a variale name to use
            $let2 = $la2[rand(0,5)]; // pick a variale name to use

            $ans1 = rand(1,9);  // generate the solution 1
            $ans2 = rand(2,11); // generate the solution 2
            if ($ans2 == $ans1) $ans2 = rand(2,11); // regenrate it

            $c1 = rand(1,6);
            $c2 = rand(1,6);
            $c3 = rand(1,6); if ($c3 == $c1) $c3 = rand(2,11); // regenrate it
            $c4 = rand(1,6); if ($c4 == $c2) $c4 = rand(2,11); // regenrate it

            $mopt = array(1,-1);
            $mp1 =$mopt[rand(0,1)];
            $mp2 =$mopt[rand(0,1)];

            $tot1 =  $c1*$ans1 + $mp1*$c2*$ans2;
            $tot2 =  $c3*$ans1 + $mp2*$c4*$ans2;

            $question1 = " $c1$let1" .( $mp1>0?"+":"-"). "$c2$let2 = $tot1 ";
            $question2 = " $c3$let1" .( $mp2>0?"+":"-"). "$c4$let2 = $tot2 ";
            $question3 = " What is $let1 and $let2 ?";

            $realQ = array(
                'no'=>$ii+1,
                'l1'=>$question1,
                'l2'=>$question2,
                'l3'=>$question3,
                'q'=>$question1 ."<br>".$question2 ."<br>". $question3,
                'ans'=> $ans1.",".$ans2
            );
            $data[] =  $realQ;

        }

        $result =array(
            'desc' =>'Basic Simultaneous Equations',
            'detail'=> 'Basic Simultaneous Equations Practice',
            'col' => 1,
            'frame'=>'line',
            'data'=>$data
        );
        return  $result;
    }

    private function EQUATION1(){
        $data = [];

        $p1=['Apple','Banana','Gape'];
        $p2=['Lemon','Mango','Orange'];
        $txtL1 = $p1[rand(0,2)];
        $txtL2 = $p2[rand(0,2)];
        for ($ii = 0; $ii < 24; $ii++) {

            $xpart = rand(1, 2);
            $xp = "";
            for ($i = 0; $i < $xpart; $i++) {
                $xc = rand(1,4);
                $xp .= ($xc>1?$xc:'')." ".$txtL1.($xc>1?"s":'').($i< $xpart-1?" + ":'');
                // $i=$i+$xc;
            }

            $ypart = rand(1, 2);
            $yp = "";
            for ($iy = 0; $iy < $ypart; $iy++) {
                $yc = rand(1,6);
                $yp .= " + ". ($yc>1?$yc:'')." ".$txtL2.($yc>1?"s":'');
            }
            $question = $xp . $yp. " = ";

            $realQ = array(
                'no'=>$ii+1,
                'l1'=>$xp,
                'l2'=>$yp,
                'l3'=>'',
                'q'=>$question,
                'ans'=> ''
            );
            $data[] =  $realQ;
        }



        $result =array(
            'desc' =>'Basic Equations Level 1',
            'detail'=> 'Basic Equations Level 1 Practice, Simplify the expressions',
            'col' => 1,
            'frame'=>'line',
            'data'=>$data
        );
        return  $result;
    }

    private function EXPONENT1(){
        $data = [];
        $la1 = array("x","a","p","r","q","s","y","z","n","m","u","f");

        for ($ii = 0; $ii < 50; $ii++) {
            $numV = rand(2,3);

            $var_list= array();

            for ($i=0; $i<$numV; $i++){
                $var_list[$i] = $la1[rand(0,(count($la1)-1))];
            }

            $numQ = rand(4,8);

            $quest_list= array();
            $quest ="";
            for ($i=0; $i<$numQ; $i++){
                $quest_list[$i] = $var_list[rand(0,(count($var_list)-1))];
                $quest .= ($i>0?" . ":'').$quest_list[$i];
            }

            $realQ = array(
                'no'=>$ii+1,
                'l1'=>'',
                'l2'=>'',
                'l3'=>'',
                'q'=>$quest." = ",
                'ans'=> ''
            );
            $data[] =  $realQ;
        }

        $result =array(
            'desc' =>'Basic Exponential Expression',
            'detail'=> 'Basic Exponential Expression Level 1, Simplify the expressions',
            'col' => 1,
            'frame'=>'line',
            'data'=>$data
        );
        return  $result;

    }

    private function EQUATION4(){
        $data = [];

$la1 = array("x","a","p","r","q","s","y","z","n","m","u","f");

for ($ii = 0; $ii < 50; $ii++) {
    $numV = rand(2, 3);

    $var_list = array();

    for ($i = 0; $i < $numV; $i++) {
        $var_list[$i] = $la1[rand(0, (count($la1) - 1))];
    }

    $numQ = rand(4, 8);
    $sign_arr = array("+", "-");

    $quest_list = array();
    $quest = "";
    for ($i = 0; $i < $numQ; $i++) {
        $quest_list[$i] = $var_list[rand(0, (count($var_list) - 1))];
        $sgn = $sign_arr[rand(0, 1)];
        if ($i == 0 && $sgn == "+") {
            $sgn = "";
        }
        $que = rand(1, 5);
        if ($que == 1) {
            $que = "";
        }

        $quest .= " ".$sgn . $que . $quest_list[$i];
    }

    $realQ = array(
        'no' => $ii + 1,
        'l1' => '',
        'l2' => '',
        'l3' => '',
        'q' => $quest . " = ",
        'ans' => ''
    );
    $data[] = $realQ;


   }
        $result =array(
            'desc' =>'Equation Simplification IV',
            'detail'=> 'Basic Exponential Expression Level 1, Simplify the expressions',
            'col' => 1,
            'frame'=>'line',
            'data'=>$data
        );
        return  $result;


    }

}