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<title>Creates a chdb instance</title>
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<h1 class="refname">chdb::__construct</h1>
<p class="verinfo">(PECL chdb >= 0.1.0)</p><p class="refpurpose"><span class="refname">chdb::__construct</span> — <span class="dc-title">Creates a <a href="class.chdb.html" class="classname">chdb</a> instance</span></p>
</div>
<div class="refsect1 description" id="refsect1-chdb.construct-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="methodname"><strong>chdb::__construct</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$pathname</code></span>
)</div>
<p class="para rdfs-comment">
Loads a chdb file, by mapping it into memory.
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
While some validity checks are performed on the specified file, they are
mostly there to avoid the possibility of common mistakes (for example,
loading a file which is not a chdb database, or that is somehow
incompatible with the current system). A maliciously crafted chdb file can
thus be dangerous if loaded, so chdb files should be trusted and treated
with the same security protections used for PHP shared libraries.
</p>
</p></blockquote>
</p>
</div>
<div class="refsect1 parameters" id="refsect1-chdb.construct-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<span class="term"><em><code class="parameter">pathname</code></em></span>
<dd>
<p class="para">
The name of the file to load.
</p>
</dd>
</dt>
</dl>
</div>
<div class="refsect1 errors" id="refsect1-chdb.construct-errors">
<h3 class="title">Errors/Exceptions</h3>
<p class="para">
Throws an exception in case the chdb file hasn't been successfully loaded.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
A valid chdb file might fail to load in case it was created on an
architecture with a different endianness, with a different version of chdb,
or if the file is too big to be mapped into memory (mostly in case of huge
files and 32-bit architectures). In these cases the load will fail by
throwing an exception, but otherwise not performing any illegal operation.
</p>
</p></blockquote>
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