How to get the suffix of uploaded file in php?

<code><span>$temp_arr</span> = explode(<span>"."</span>, <span>$file_name</span>);
 <span>$file_ext</span> = array_pop(<span>$temp_arr</span>);
 <span>$file_ext</span> = <span>trim</span>(<span>$file_ext</span>);
 <span>$file_ext</span> = strtolower(<span>$file_ext</span>);</code>

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