Description:
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From manual page: http://www.php.net/language.operators.assignment
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I often find myself setting default values to variables using syntax of the form:

$a = $a ?? "default";

The same code in Ruby would be written as

a ||= "default"

Which is more concise and reduces boilerplate. It would be great if PHP could support such shorthand syntax. For example, how about a "null coalescing" assignment operator:

$a ??= 'default'