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@ 2017-05-02T16:32:26Z

<?php

$string = 'meu.arquivo.com.muitos.pontos.e.uma.extensao.ext';

$file = new SplFileInfo($string);
printf("Extensão: %s" , $file->getExtension());

Output
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References
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printf: documentation ( source)

preferences:dark modelive previewkey bindings

91.19 ms | 404 KiB | 5 Q