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What does this code display?
<?php
echo $a?->b() ?? 'test';
0
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7
PHP code that throws an error.4
Use the match expression in PHP to print a string.4
Is this function signature valid?
```php
<?php
interface Demo
{
public function bar(): ?mixed;
}
```5
Check if a value is in an array in PHP5
PHP function with named and positional arguments.5
Which function signature is valid?4
Attributes are metadata that can be added to classes, properties, constants or methods.