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<title>Pump data into an active hashing context from an open stream</title>
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<div class="refnamediv">
<h1 class="refname">hash_update_stream</h1>
<p class="verinfo">(PHP 5 >= 5.1.2, PECL hash >= 1.1)</p><p class="refpurpose"><span class="refname">hash_update_stream</span> — <span class="dc-title">Pump data into an active hashing context from an open stream</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.hash-update-stream-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>hash_update_stream</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$context</code></span>
, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$handle</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code><span class="initializer"> = -1</span></span>
] )</div>
</div>
<div class="refsect1 parameters" id="refsect1-function.hash-update-stream-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">context</code></em></span>
<dd>
<p class="para">
Hashing context returned by <span class="function"><a href="function.hash-init.html" class="function">hash_init()</a></span>.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">handle</code></em></span>
<dd>
<p class="para">
Open file handle as returned by any stream creation function.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">length</code></em></span>
<dd>
<p class="para">
Maximum number of characters to copy from <em><code class="parameter">handle</code></em>
into the hashing context.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.hash-update-stream-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Actual number of bytes added to the hashing context from <em><code class="parameter">handle</code></em>.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.hash-update-stream-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-836">
<p><strong>Example #1 <span class="function"><strong>hash_update_stream()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">tmpfile</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">'The quick brown fox jumped over the lazy dog.'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">rewind</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$ctx </span><span style="color: #007700">= </span><span style="color: #0000BB">hash_init</span><span style="color: #007700">(</span><span style="color: #DD0000">'md5'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">hash_update_stream</span><span style="color: #007700">(</span><span style="color: #0000BB">$ctx</span><span style="color: #007700">, </span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">hash_final</span><span style="color: #007700">(</span><span style="color: #0000BB">$ctx</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
5c6ffbdd40d9556b73a21e63c3e0e904
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.hash-update-stream-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.hash-init.html" class="function" rel="rdfs-seeAlso">hash_init()</a> - Initialize an incremental hashing context</span></li>
<li class="member"> <span class="function"><a href="function.hash-update.html" class="function" rel="rdfs-seeAlso">hash_update()</a> - Pump data into an active hashing context</span></li>
<li class="member"> <span class="function"><a href="function.hash-final.html" class="function" rel="rdfs-seeAlso">hash_final()</a> - Finalize an incremental hash and return resulting digest</span></li>
<li class="member"> <span class="function"><a href="function.hash.html" class="function" rel="rdfs-seeAlso">hash()</a> - Generate a hash value (message digest)</span></li>
<li class="member"> <span class="function"><a href="function.hash-file.html" class="function" rel="rdfs-seeAlso">hash_file()</a> - Generate a hash value using the contents of a given file</span></li>
</ul>
</p>
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