Description:
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From PHP 7 null-coalescing operator is a great option to avoid a previous exists check with isset.

But I think that this comaparison can be improved adding a ternary operator like ??: and check also empty values.

Check example into text script section.


Test script:
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<?php

$foo = '';

// Current response with null-coalescing operator

echo $foo ?? 'default'; // ''

// Possible response with ternary null-coalescing operator

echo $foo ??: 'default'; // 'defaut'

// Same response with current available PHP code

echo (isset($foo) && $foo) ? $foo : 'default'; // 'default'

$foo = false;

// Current response with null-coalescing operator

echo $foo ?? 'default'; // false

// Possible response with ternary null-coalescing operator

echo $foo ??: 'default'; // 'defaut'

// Same response with current available PHP code

echo (isset($foo) && $foo) ? $foo : 'default'; // 'default'

$foo = null;

// Current response with null-coalescing operator

echo $foo ?? 'default'; // 'defaut'

// Possible response with ternary null-coalescing operator

echo $foo ??: 'default'; // 'defaut'

// Same response with current available PHP code

echo (isset($foo) && $foo) ? $foo : 'default'; // 'default'