I am using PHP's null coalescing operator described by http://php.net/manual/en/migration70.new-features.php.
Null coalescing operator ?
The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary in conjunction with isset(). It returns its first operand if it exists and is not NULL; otherwise it returns its second operand.
<?php
// Fetches the value of $_GET['user'] and returns 'nobody'
// if it does not exist.
$username = $_GET['user'] ?? 'nobody';
// This is equivalent to:
$username = isset($_GET['user']) ? $_GET['user'] : 'nobody';
// Coalescing can be chained: this will return the first
// defined value out of $_GET['user'], $_POST['user'], and
// 'nobody'.
$username = $_GET['user'] ?? $_POST['user'] ?? 'nobody';
?>
I noticed the following doesn't produce my expected results which was to add a new phone
index to $params
whose value is "default".
$params=['address'=>'123 main street'];
$params['phone']??'default';
Why not?
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