📄 function.hash-copy.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Copy hashing context</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.hash-algos.html">hash_algos</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.hash-file.html">hash_file</a></div> <div class="up"><a href="ref.hash.html">Hash Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.hash-copy" class="refentry"> <div class="refnamediv"> <h1 class="refname">hash_copy</h1> <p class="verinfo">(No version information available, might be only in CVS)</p><p class="refpurpose"><span class="refname">hash_copy</span> — <span class="dc-title">Copy hashing context</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>hash_copy</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$context</tt></span> )</div> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">context</tt></i></span> <dd> <p class="para"> Hashing context returned by <a href="function.hash-init.html" class="function">hash_init()</a>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns a copy of Hashing Context resource. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>hash_copy()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$context </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</span><span style="color: #007700">(</span><span style="color: #0000BB">$context</span><span style="color: #007700">, </span><span style="color: #DD0000">"data"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* copy context to be able to continue using it */<br /></span><span style="color: #0000BB">$copy_context </span><span style="color: #007700">= </span><span style="color: #0000BB">hash_copy</span><span style="color: #007700">(</span><span style="color: #0000BB">$context</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">hash_final</span><span style="color: #007700">(</span><span style="color: #0000BB">$context</span><span style="color: #007700">), </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">hash_update</span><span style="color: #007700">(</span><span style="color: #0000BB">$copy_context</span><span style="color: #007700">, </span><span style="color: #DD0000">"data"</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">hash_final</span><span style="color: #007700">(</span><span style="color: #0000BB">$copy_context</span><span style="color: #007700">), </span><span style="color: #DD0000">"\n"</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"><pre><div class="cdata"><pre>8d777f385d3dfec8815d20f7496026dc511ae0b1c13f95e5f08f1a0dd3da3d93</pre></div> </pre></div> </div> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.hash-algos.html">hash_algos</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.hash-file.html">hash_file</a></div> <div class="up"><a href="ref.hash.html">Hash Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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