stripcslashes
Anti-reference a string escaped using addcslashes()
Remove the backslash in front of "World!":
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token keyword">echo</span> <span class="token function">stripslashes</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Hello \World!"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>