Click here to Skip to main content
15,937,186 members
Please Sign up or sign in to vote.
0.00/5 (No votes)
See more:
<?php
  require_once('defines.php');

  class Node {
    /************* 
      PROPERTIES 
    **************/
    const rollNumberRegex = '/([0-9]+)(\/[a-zA-Z]+\/[0-9]{2})/';
    private $teacher;      // teacher_id
    private $subjectCode; 
    private $section;    
    private $year;       
    private $semester;    
    private $numberOfDays; 
    private $records = array(); // array of key value paired array for each student
   
    /********** 
      METHODS 
    ***********/
    
    # CONSTRUCTORS
     
    function __construct() {  
      // constructor to allow multiple constructors with different number of arguments
      $a = func_get_args();
      $i = func_num_args();
      if (method_exists($this,$f='__construct'.$i)) {
        call_user_func_array(array($this,$f),$a); 
      }
    }
    function __construct7($code,$teacher_uid,$year,$semester,$section,$start,$end) {
      $this->setCode($code);
      $this->setTeacher($teacher_uid);
      $this->setYear($year);
      $this->setSemester($semester);
      $this->setSection($section);
      $this->setDays(0);
      $this->initRecords($start,$end);
      if($this->saveNode() === false) {
        echo false;
      }
    }
    # HELPER FUNCTIONS
    
    public function retrieveObject($code,$section,$year) {
    /*
      Takes -> SubjectCode , Section , Year
      Returns -> A new Object of Node class based on code , section and year of a class
      Errors -> false for any kind of error
    */
      $con = connectTo();
      
      $code = sqlReady($code);
      $section = sqlReady($section);
      $year = sqlReady($year);
      
      if($con->connect_errno) {
      	return false;
      } else {
        $obj = $con->query('select object from objects where code = "'.$code.'" and section = "'.$section.'" and year = "'.$year.'"');
        if($con->errno) {
          return false;
        } else {
            if($obj->num_rows == 1) {
              $obj = $obj->fetch_assoc()['object'];
              return unserialize($obj);							
            } else { 
              return false;
            }
        }
      }
    }
    public function retrieveObjecti($class_id,$teacher_uid) {
    /*
      Takes -> Class Unique ID from objects table , Teacher Unique ID from teacher table
      Returns -> A new Object of Node class based on code , section and year of a class
      Errors -> false for any kind of error
    */
      $con = connectTo();
      
      $class_id = sqlReady($class_id);
      $teacher_uid = sqlReady($teacher_uid);
      
      if($con->connect_errno) {
      	return false;
      } else {
        $obj = $con->query('select object from objects where uid = "'.$class_id.'" and teacher_uid = "'.$teacher_uid.'"');
        if($con->errno) {
          return false;
        } else {
            if($obj->num_rows == 1) {
              $obj = $obj->fetch_array()['object'];
              return unserialize($obj);							
            } else { 
              return false;
            }
        }
      }
    }
    public function initRecords($start,$end) { 
    /*
      Takes -> Starting and ending roll number
      Does -> Initializes the records. It will update the records property based on starting and ending roll number
      Errors -> false for any kind of error
    */
      if(verify(ROLL,$start) === false) return false;
      if(verify(ROLL,$end) === false) return false;
      
      $s = preg_replace(self::rollNumberRegex,"$1",$start);
      $e = preg_replace(self::rollNumberRegex,"$1",$end);
      $type = preg_replace(self::rollNumberRegex,"$2",$start);
      
      # UPDATING THE RECORDS ARRAY
      foreach(range($s,$e) as $d) {
        $this->records[$d.$type] = array('present'=>0,'timeline'=>array()); 
      }
    }
    public function deleteNode() {
    /*
      Does -> Deletes the node from data base
      Returns -> true if deleted , false in case of any error
    */
      $con = connectTo();
      if($con->connect_errno) {
      	return false;
      } else {
        $teacher_uid = $this->getTeacherID();
        $code = $this->getCode();
        $section = $this->getSection();
        $year = $this->getYear();
        $obj = $con->query('delete from objects where teacher_uid = "'.$teacher_uid.'" and code = "'.$code.'" and section = "'.$section.'" and year = "'.$year.'"');
        if($obj && $con->affected_rows) {
          return true;
        } else {
          return false;
        }
      }
    }
    public function saveNode() {
    /*
      Does -> Saves the node into data base , it also inserts if the object isn't present in database.
      Warning -> Don't use it if you have edited section , code or year
      Returns -> true if saved , false in case of any error
    */
      $con = connectTo();
      if($con->connect_errno) {
      	return false;
      } else {
      $teacher_uid = $this->getTeacherID();
      $code = $this->getCode();
      $section = $this->getSection();
      $year = $this->getYear();
      $obj = $con->query('select object from objects where teacher_uid = "'.$teacher_uid.'" and code = "'.$code.'" and section = "'.$section.'" and year = "'.$year.'"');
      if($obj->num_rows)
        $obj = $con->query('update objects set object = "'.$con->real_escape_string(serialize($this)).'" where teacher_uid = "'.$teacher_uid.'" and code = "'.$code.'" and section = "'.$section.'" and year = "'.$year.'"');
      else 
        $obj = $con->query($q= 'insert into `objects`(`teacher_uid`, `code`, `year`, `section`, `object`) VALUES ("'.$teacher_uid.'","'.$code.'","'.$year.'","'.$section.'","'.$con->real_escape_string(serialize($this)).'")');
        if($con->errno) {
          return false;
        } else {
          return true;							
        }
      }
      return false;
    }
    public function saveNodei($class_id) {
    /*
      Does -> Saves the node into data base on basis of class_id , this is used in case of editing the unique parameters like section , year and code
      Returns -> true if saved , false in case of any error
    */
      $con = connectTo();
      if($con->connect_errno) {
      	return false;
      } else {
        $teacher_uid = $this->getTeacherID();
        $code = $this->getCode();
        $section = $this->getSection();
        $year = $this->getYear();
        $selectedNode = $con->query('select object from objects where uid = '.$class_id.' and  teacher_uid = '.$teacher_uid);
        if($selectedNode && $con->affected_rows) {
          $obj = $con->query('update objects set code = "'.$code.'", year = "'.$year.'", section = "'.$section.'", object = "'.$con->real_escape_string(serialize($this)).'" where teacher_uid = "'.$teacher_uid.'" and uid = "'.$class_id.'"');
          if($obj && $con->affected_rows) {
            return true;
          }        
          return false;
        }
        return false;
      }
    }
    public function isPresent($rollNumber,$newPresents) {
    /*
     Takes -> Roll number and new number of present days
     Does -> Tells if that student was present or not
     Returns -> 1 if present , 0 if absent , false if not found
    */
      if(isset($this->records[$rollNumber]))
        return ( $this->records[$rollNumber]['present'] < $newPresents )? 1 : 0;
      return false;
    }
    public function deleteRoll($rollNumber) {
    /*
     Takes -> Roll number 
     Does -> Deletes a roll number
     Returns -> true if deleted , false if not found
    */
      if(isset($this->records[$rollNumber])) {
        unset($this->records[$rollNumber]);
        return true;
      }
      return false;
    }
    
    /**********
      GETTERS
    **********/
    
    public function getTeacherID() {
    /*
     Returns -> Teacher unique ID
    */
      return $this->teacher;
    }
    public function getTeacherName() {
    /*
     Returns -> Teacher name by searching in data base
    */
      $con = connectTo();
      $s = $con->query("select name from teacher where uid = ".$this->getTeacherID());
      $name = $s->fetch_assoc();
      $name = $name['name'];
      return $name;
    }
    public function getCode() {
    /*
     Returns -> Class code
    */
      return $this->subjectCode;
    }
    public function getYear() {
    /*
     Returns -> Year of class
    */
      return $this->year;
    }
    public function getSemester() {
    /*
     Returns -> Semester of class
    */
      return $this->semester;
    }
    public function getSection() {
    /*
     Returns -> Section of class
    */
      return $this->section;
    }
    public function getDays() {
    /*
     Returns -> Days conducted by teacher for the class
    */
      return $this->numberOfDays;
    }
    public function getPercent($rollNumber) {
    /*
     Takes -> Roll number
     Returns -> Computers the percentage and returns it
     Errors -> False if not found
    */
      return isset($this->records[$rollNumber])?(100*($this->records[$rollNumber]['present']/$this->getDays())):false;
    }
    public function getTimeline($rollNumber) {
    /*
     Takes -> Roll number
     Returns -> Returns the timeline for that roll number
     Errors -> False if not found
    */
      return isset($this->records[$rollNumber])?$this->records[$rollNumber]['timeline']:false;
    }
    public function getRecords() {
    /*
     Returns -> Returns the records for entire object
    */
      return $this->records;
    }
    /**************
        SETTERS 
    **************/
    public function setTeacher($val) {
    /*
     Takes -> Value
    */
      $this->teacher = $val;
    }
    public function setCode($val) {
    /*
     Takes -> Value
    */
      $this->subjectCode = $val;
    }
    public function setYear($val) {
    /*
     Takes -> Value
    */
      $this->year = $val;
    }
    public function setSemester($val) {
    /*
     Takes -> Value
    */
      $this->semester = $val;
    }
    public function setSection($val) {
    /*
     Takes -> Value
    */
      $this->section = $val;
    }
    public function setDays($val) {
    /*
     Takes -> Value
    */
      $this->numberOfDays = $val;
    }
    public function setPresence($rollNumber,$newPresents,$timestamp) {
    /*
     Takes -> Roll Number, New Presents , Timestamp
     Returns -> False if error
    */
      if(isset($this->records[$rollNumber])) {
        $this->records[$rollNumber]['timeline'][$timestamp] =  $this->isPresent($rollNumber,$newPresents);
        $this->records[$rollNumber]['present'] = $newPresents;
      } else
        return false;
    }
  }
?>


What I have tried:

$obj = $obj->fetch_assoc()['object'];

this line problem
Posted
Updated 17-Jan-23 22:12pm

1 solution

Try using it like you do elsewhere:
$name = $s->fetch_assoc();
$name = $name['name'];
 
Share this answer
 

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)



CodeProject, 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 +1 (416) 849-8900