Are PHP Variables passed by value or by reference?

hqdefault

It’s by value according to the PHP Documentation.

By default, function arguments are passed by value (so that if the value of the argument within the function is changed, it does not get changed outside of the function). To allow a function to modify its arguments, they must be passed by reference.

To have an argument to a function always passed by reference, prepend an ampersand (&) to the argument name in the function definition.

<?php
function changeValue(&$var)
{
    $var++;
}

$result=5;
changeValue($result);

echo $result; // $result is 6 here
?>

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Nested namespaces in PHP

namespacesIt’s true that “Namespace declarations cannot be nested”.Namespacing is used to avoid conflicting definitions and introduce more flexibility and organization in your code.The brackets surrounding the namespace code block are completely optional.If we want to translate namespace code to run able in php. We can write like:

namespace Foo\Bar;

class X{
    // Your properties
}
class Y {
// Your properties
}

If  need more information you can see this link well written by Elias Zerrouq with example http://code.tutsplus.com/tutorials/namespacing-in-php–net-27203