function.serialize.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>Generates a storable representation of a value</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.print-r.html">print_r</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.settype.html">settype</a></div> <div class="up"><a href="ref.var.html">Variable handling Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.serialize" class="refentry"> <div class="refnamediv"> <h1 class="refname">serialize</h1> <p class="verinfo">(PHP 4, PHP 5, PECL axis2:0.1.0-0.1.1)</p><p class="refpurpose"><span class="refname">serialize</span> — <span class="dc-title">Generates a storable representation of a value</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>serialize</b></b></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$value</tt></span> )</div> <p class="para rdfs-comment"> Generates a storable representation of a value </p> <p class="para"> This is useful for storing or passing PHP values around without losing their type and structure. </p> <p class="para"> To make the serialized string into a PHP value again, use <a href="function.unserialize.html" class="function">unserialize()</a>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">value</tt></i></span> <dd> <p class="para"> The value to be serialized. <b>serialize()</b> handles all types, except the <a href="language.types.resource.html" class="type resource">resource</a>-type. You can even <b>serialize()</b> arrays that contain references to itself. Circular references inside the array/object you are <b>serialize()</b>ing will also be stored. Any other reference will be lost. </p> <p class="para"> When serializing objects, PHP will attempt to call the member function <a href="language.oop5.magic.html" class="link">__sleep</a> prior to serialization. This is to allow the object to do any last minute clean-up, etc. prior to being serialized. Likewise, when the object is restored using <a href="function.unserialize.html" class="function">unserialize()</a> the <a href="language.oop5.magic.html" class="link">__wakeup</a> member function is called. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns a string containing a byte-stream representation of <i><tt class="parameter">value</tt></i> that can be stored anywhere. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>serialize()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// $session_data contains a multi-dimensional array with session<br />// information for the current user. We use serialize() to store<br />// it in a database at the end of the request.<br /><br /></span><span style="color: #0000BB">$conn </span><span style="color: #007700">= </span><span style="color: #0000BB">odbc_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"webdb"</span><span style="color: #007700">, </span><span style="color: #DD0000">"php"</span><span style="color: #007700">, </span><span style="color: #DD0000">"chicken"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$stmt </span><span style="color: #007700">= </span><span style="color: #0000BB">odbc_prepare</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">"UPDATE sessions SET data = ? WHERE id = ?"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$sqldata </span><span style="color: #007700">= array (</span><span style="color: #0000BB">serialize</span><span style="color: #007700">(</span><span style="color: #0000BB">$session_data</span><span style="color: #007700">), </span><span style="color: #0000BB">$_SERVER</span><span style="color: #007700">[</span><span style="color: #DD0000">'PHP_AUTH_USER'</span><span style="color: #007700">]);<br />if (!</span><span style="color: #0000BB">odbc_execute</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">, &</span><span style="color: #0000BB">$sqldata</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$stmt </span><span style="color: #007700">= </span><span style="color: #0000BB">odbc_prepare</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">"INSERT INTO sessions (id, data) VALUES(?, ?)"</span><span style="color: #007700">);<br /> if (!</span><span style="color: #0000BB">odbc_execute</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">, &</span><span style="color: #0000BB">$sqldata</span><span style="color: #007700">)) {<br /> </span><span style="color: #FF8000">/* Something went wrong.. */<br /> </span><span style="color: #007700">}<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.0.7</td> <td colspan="1" rowspan="1" align="left"> The object serialization process was fixed. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.0.0</td> <td colspan="1" rowspan="1" align="left"> When serializing an object, methods are not lost anymore. Please see the <a href="language.oop.serialization.html" class="link">Serializing Objects</a> for more information. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: It is not possible to serialize PHP built-in objects. <br /> </p></blockquote> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.unserialize.html" class="function" rel="rdfs-seeAlso">unserialize()</a></li> <li class="member"><a href="language.oop.serialization.html" class="link">Serializing Objects</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.print-r.html">print_r</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.settype.html">settype</a></div> <div class="up"><a href="ref.var.html">Variable handling 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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