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What is difference between $x and $$x
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Answer / deepesh mehta
This type of variable diclearation is called "Variable
variables".
Sometimes it is convenient to be able to have variable
variable names. That is, a variable name which can be set
and used dynamically. A normal variable is set with a
statement such as:
$x = 'hello';
A variable variable takes the value of a variable and
treats that as the name of a variable. In the above
example, hello, can be used as the name of a variable by
using two dollar signs. i.e.
$$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
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| Is This Answer Correct ? | 0 Yes | 7 No |
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