Get file extension
This function works correct with files with no extension.
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function getExtension($filename)
{
return ('.' . ($ext = pathinfo($filename, PATHINFO_EXTENSION
)) == $filename) ?
null : $ext;
}
// Example:
var_dump(getExtension
('.htaccess'), getExtension
('image.jpg'));
// Result:
// NULL
// string(3) "jpg"
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