Answer Posted / prasad

$message is variable and $$message is variable variable.
$message="hello";
$$message="world";
echo $hello; // prints world
echo ${$message} //prints world

variable variable cant be used in php superglobalarray. and
cant use in functions and within classes

Which function is used in php to delete a file?

1021

---

Write down the benefits of php7?

1051

---

What is the difference between $_files['userfile']['name'] and $_files['userfile']['tmp_name']?

933

---

What is escape data in php?

943

---

Write a program to display reverse of any number?

907

---

Tell me how do I escape data before storing it into the database?

1056

---

Does php support overloading?

1033

---

Tell me what is the main difference between php 4 and php 5?

990

---

Tell me what does the array operator '===' means?

1111

---

What is use of header() function in php?

1027

---

Explain some most commonly use string functions in php?

1013

---

Explain the difference between require() and require_once()?

964

---

What is lazy loading in php?

956

---

What is a string in php?

974

---

What is final keyword in php?

1040

---