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    <p>As <a href="http://docs.php.net/include" rel="noreferrer"><code>include</code></a> is a special language construct and not a function, it doesn’t need paranthesis for the paremeter list:</p> <blockquote> <p>Because <code>include()</code> is a special language construct, parentheses are not needed around its argument. Take care when comparing return value.</p> </blockquote> <p>In fact it has just one parameter and wrapping it in additional parenthesis doesn’t change anything:</p> <blockquote> <p>1 ≡ (1) ≡ ((1)) ≡ (((1))) ≡ …</p> </blockquote> <p>So your statement is identical to this (the paremter is just wrapped):</p> <pre><code>require_once (('abc.php') or die("oops")); </code></pre> <p>So we have a boolean expression as parameter that is either <em>true</em> or <em>false</em>. And that values have the string equivalent of <code>"1"</code> and <code>""</code> respectively:</p> <pre><code>var_dump((string) true === "1"); var_dump((string) false === ""); </code></pre> <p>That’s the reason why get this <em>Failed opening required '1'</em> error message.</p> <p>But using parenthesis on the right place like this makes it work like you want it:</p> <pre><code>(@include_once 'abc.php') or die("oops"); </code></pre> <p>Here <code>'abc.php'</code> is clearly the parameter and the disjunction with <code>die("oops")</code> is performed on the return value of <code>include_once</code>. The <a href="http://docs.php.net/manual/en/language.operators.errorcontrol.php" rel="noreferrer"><code>@</code> operator</a> is just to ignor the error message <code>includ_once</code> will throw if the file does not exist.</p> <p>PS: <a href="http://docs.php.net/print" rel="noreferrer"><code>print</code></a> is also a special language construct and works the same way.</p>
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