What is difference between $x and $$x
Answers were Sorted based on User's Feedback
Answer / deepesh mehta
This type of variable diclearation is called "Variable
variables".
Sometimes it is convenient to be able to have variable
variable names. That is, a variable name which can be set
and used dynamically. A normal variable is set with a
statement such as:
$x = 'hello';
A variable variable takes the value of a variable and
treats that as the name of a variable. In the above
example, hello, can be used as the name of a variable by
using two dollar signs. i.e.
$$x = 'world';
At this point two variables have been defined and stored in
the PHP symbol tree: $a with contents "hello" and $hello
with contents "world". Therefore, this statement
echo "$x ${$x}";
produces the exact same output as:
echo "$a $hello";
i.e. they both produce: hello world.
Is This Answer Correct ? | 34 Yes | 8 No |
Answer / chinuku
$var is a variable and $$variable is a Reference or Dynamic
variable
ex:$var="test";
$test="php";
<?php
echo $var;
echo $$var;
?>
ans
$var=test;
$$var=php;
Is This Answer Correct ? | 22 Yes | 4 No |
Answer / muzic
$x is a simple variable whereas $$x is a reference variable.
Is This Answer Correct ? | 18 Yes | 4 No |
Answer / psharma05
$x is a simple variable where $$x means value of $x becomes other variable.
eg.
$x="hello";
$$x="hi";
echo $hello;
output will be:
hi
Is This Answer Correct ? | 11 Yes | 5 No |
Answer / khan
Visit http://filesharepoint.com To Download free Scripts
books and many more just click the link below
<a
href='http://filesharepoint.com'>http://filesharepoint.com</a>
Is This Answer Correct ? | 0 Yes | 7 No |
Is php outdated 2019?
How does one prevent the following warning ‘warning: cannot modify header information – headers already sent' and why does it occur in the first place?
What does the expression exception::__tostring means?
how to insert logout time when browser close
What are the Advantages and Application Areas of PHP?
What does php exit do?
What are the difference between abstract class and interface in oops?
Does php support function overloading?
Write a program to get second highest number in an array using php?
How to convert a character to an ascii value?
Write a program to find no of days between two dates in php?
What is the function of mysql_real_escape_string in php?