All About Basic

<?php
$fname = "Tom";
$lname = "Hanks";

$newFname ;

$fname = $newFname ?? $fname;

echo $fname;

$newFname= "Jon";
$fname = $newFname ?? $fname;
echo "<br>";
echo $fname;

?>

<?php
class StudentInfo{
    public $name;
    public $age;
    private $mobileNum;
    public  function setMobileNum($mobileNum){
        $this->mobileNum=$mobileNum;
    }
    public function getMobileNum(){
        return $this->mobileNum; 
    }
}
$student = new StudentInfo();
$student -> name ="Tommy Jones";
$student -> age =45;
print_r($student);
$student->setMobileNum('11111111');
echo "<br>";
print_r($student);
$jsonEncoded=json_encode($student);
echo "<br>";
print_r($jsonEncoded);
$jsonDecoded=json_decode($jsonEncoded);
echo "<br>";
print_r($jsonDecoded);
$jsonDecodedArray=json_decode($jsonEncoded,true);
echo "<br>";
print_r($jsonDecodedArray);
?>

<?php 
class studentInfo{
    public $name;
    public $age;
    private $mobileNum;
public function setMobileNum($mobileNum){
    $this->mobileNum=$mobileNum;
}
public function getMobileNum(){
    return $this->mobileNum;
}


}
$student = new studentInfo();
$student->name= "Tom hanks";
$student->age = 45;
 $student->setMobileNum('11111111');
//echo $student->getMobileNum();
echo json_encode($student);
?>

<?php

$studentNum=0;
if(isset($studentNum)){
echo "value is set ";
}else{
    echo "value not set";
}
echo "<br>";
if(empty($studentNum)){
    echo "value is empty";
}else{
    echo "value not empty";
}
echo "<br>";
if(isset($studentNum) && (is_numeric($studentNum) || $studentNum !='')){
    echo "there is value and not empty";
}else{
    echo " not set or empty";
}
?>

value is set
value is empty
there is value and not empty

<?php 
/*** remove key and data from associative array PHP */

$studentInfo =["name"=>"Tomy Jason","age"=>45,"sex"=>"Male"];
print_r($studentInfo);
  unset($studentInfo["sex"]);
echo "<br>";
print_r($studentInfo);

?>

<?php
$customer= [
"name"=>"Tommy Jason",
"age" => 45,
"sex" => "Male",
"location" => "USA"
];
print_r($customer);
echo "Serialized: <br>";
$serializedCustomer =serialize($customer);
echo $serializedCustomer;
echo "<br>";
echo "Unserialized: <br>";
$unserializedCustomer =unserialize($serializedCustomer);
print_r($unserializedCustomer);
echo "<br>";
echo "JSon Encoded<br>";
echo $jsonEncoded = json_encode($customer);
echo "<br>";
echo "Json Decoded --converted to object <br>";
$jsonDecoded= json_decode($jsonEncoded);
print_r($jsonDecoded);
echo "<br>Json Decoded --converted to Array <br>";
$jsonDecoded= json_decode($jsonEncoded,true);
print_r($jsonDecoded);
echo "<br>";

?>

<?php
$students=[
    '12'=>'Tom',
    '13'=>'Shib',
    '14'=>[
        '12'=>'Tom Spanish',
        '13'=>'Shib Spanish'
    ]
];
var_dump($students);
echo "<br>";

print_r($students);
echo "<br>";

echo $students["14"]["13"];
echo "<br>";
$food=array(
    "vegetables" => "tomato,potato",
    "frutis" => "apple, banana",
    "drinks" => array(
        "soft"=>"coke,fanta",
        "beverage" => "x,y,z",
    )
);

print_r($food);
echo "<br>";
echo $food["drinks"]["soft"];
?>