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<?php
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function file_extension($str1){
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$str1=implode("",explode("\\",$str1));
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$str1=explode(".",$str1);
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$str1=strtolower(end($str1));
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return $str1;
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}
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$file='example.txt';
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echo "\n".file_extension($file)."\n";
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?>
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