Meaning of "Fatal error: Allowed memory size of x bytes exhausted (tried to allocate y bytes)"?
<p>(This is a very frequent error, but couldn't find the meaning.)</p>

<pre><code>Fatal error: Allowed memory size of x bytes exhausted (tried to allocate y bytes)
</code></pre>

<p>I have some questions:</p>

<ol>
<li>This is obviously an out-of-memory error, but what does it means in Layman's terms?</li>
<li>Is it possible to know some information (like server's RAM) from <code>x</code>?</li>
<li>What about <code>y</code>? Sometimes it is a two-digits number.</li>
</ol>

<p>Thanks.</p>
