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copied!<p>Your code is syntactical valid but semantical probably not what you wanted.</p> <p>Because <code>$var1 || $var2</code> is a <a href="http://php.net/language.operators.logical" rel="nofollow noreferrer">boolean expression</a> and always yields <em>true</em> or <em>false</em>. And then <code>$var</code> is compared to the result of that boolean expression. So <code>$var</code> is always compared to either <em>true</em> or <em>false</em> and not to <code>$var1</code> or <code>$var2</code> (that’s what you’re have probably expected). So it’s not a shorthand to <code>($var == $var1) || ($var == $var2)</code>.</p> <p>Now as you already noted yourself, <a href="http://php.net/in_array" rel="nofollow noreferrer"><code>in_array</code></a> is a solution to this problem if you don’t want to write expressions like <code>($var == $var1) || ($var == $var2)</code>, especially when you have an arbitrary number of values you want to compare to:</p> <pre><code>in_array($var, array($var1, $var2)) </code></pre> <p>Which is equivalent to:</p> <pre><code>($var == $var1) || ($var == $var2) </code></pre> <p>If you need a <a href="http://php.net/language.operators.comparison" rel="nofollow noreferrer">strict comparison</a> (using <code>===</code> rather than <code>==</code>), set the third parameter to <em>true</em>:</p> <pre><code>in_array($var, array($var1, $var2), true) </code></pre> <p>Which is now equivalent to:</p> <pre><code>($var === $var1) || ($var === $var2) </code></pre>

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