copy

Example

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span><span class="token function"></span></span><mark> <span class="token function">copy</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"source.txt"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"target.txt"</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span>

Output:

 1