(PHP 5 >= 5.1.2, PHP 7)
SplFileInfo::isWritable — Tells if the entry is writable
public SplFileInfo::isWritable ( ) : bool
Checks if the current entry is writable.
This function has no parameters.
Returns true if writable, false otherwise;
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https://www.php.net/manual/en/splfileinfo.iswritable.php