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c91e245074
The main aim is to exclude boolean false, which could be coerced into '' in the following cases:
```
file_put_contents('outfile', file_get_contents('invalid_file')); // false instead of string
file_put_contents('outfile', fopen('invalid_file', 'r')); // false instead of resource
file_put_contents('outfile', file('invalid_file')); // false instead of array
```