<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>The CachingIterator class</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="arrayiterator.valid.html">ArrayIterator::valid</a></div> <div class="next" style="text-align: right; float: right;"><a href="cachingiterator.construct.html">CachingIterator::__construct</a></div> <div class="up"><a href="spl.iterators.html">Iterators</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="class.cachingiterator" class="reference"> <h1 class="title">The CachingIterator class</h1> <div class="partintro"><p class="verinfo">(PHP 5)</p> <div class="section" id="cachingiterator.intro"> <h2 class="title">Introduction</h2> <p class="para"> This object supports cached iteration over another iterator. </p> </div> <div class="section" id="cachingiterator.synopsis"> <h2 class="title">Class synopsis</h2> <div class="classsynopsis"> <div class="ooclass"></div> <div class="classsynopsisinfo"> <span class="ooclass"> <strong class="classname">CachingIterator</strong> </span> <span class="ooclass"> <span class="modifier">extends</span> <a href="class.iteratoriterator.html" class="classname">IteratorIterator</a> </span> <span class="oointerface">implements <span class="interfacename"><a href="class.outeriterator.html" class="interfacename">OuterIterator</a></span> </span> <span class="oointerface">, <span class="interfacename"><a href="class.arrayaccess.html" class="interfacename">ArrayAccess</a></span> </span> <span class="oointerface">, <span class="interfacename"><a href="class.countable.html" class="interfacename">Countable</a></span> </span> {</div> <div class="classsynopsisinfo classsynopsisinfo_comment">/* Constants */</div> <div class="fieldsynopsis"> <span class="modifier">const</span> <span class="type">integer</span> <var class="fieldsynopsis_varname"><a href="class.cachingiterator.html#cachingiterator.constants.call-tostring"><var class="varname">CALL_TOSTRING</var></a></var> <span class="initializer"> = 1</span> ;</div> <div class="fieldsynopsis"> <span class="modifier">const</span> <span class="type">integer</span> <var class="fieldsynopsis_varname"><a href="class.cachingiterator.html#cachingiterator.constants.catch-get-child"><var class="varname">CATCH_GET_CHILD</var></a></var> <span class="initializer"> = 16</span> ;</div> <div class="fieldsynopsis"> <span class="modifier">const</span> <span class="type">integer</span> <var class="fieldsynopsis_varname"><a href="class.cachingiterator.html#cachingiterator.constants.tostring-use-key"><var class="varname">TOSTRING_USE_KEY</var></a></var> <span class="initializer"> = 2</span> ;</div> <div class="fieldsynopsis"> <span class="modifier">const</span> <span class="type">integer</span> <var class="fieldsynopsis_varname"><a href="class.cachingiterator.html#cachingiterator.constants.tostring-use-current"><var class="varname">TOSTRING_USE_CURRENT</var></a></var> <span class="initializer"> = 4</span> ;</div> <div class="fieldsynopsis"> <span class="modifier">const</span> <span class="type">integer</span> <var class="fieldsynopsis_varname"><a href="class.cachingiterator.html#cachingiterator.constants.tostring-use-inner"><var class="varname">TOSTRING_USE_INNER</var></a></var> <span class="initializer"> = 8</span> ;</div> <div class="fieldsynopsis"> <span class="modifier">const</span> <span class="type">integer</span> <var class="fieldsynopsis_varname"><a href="class.cachingiterator.html#cachingiterator.constants.full-cache"><var class="varname">FULL_CACHE</var></a></var> <span class="initializer"> = 256</span> ;</div> <div class="classsynopsisinfo classsynopsisinfo_comment">/* Methods */</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="methodname"><a href="cachingiterator.construct.html" class="methodname">__construct</a></span> ( <span class="methodparam"><span class="type"><a href="class.iterator.html" class="type Iterator">Iterator</a></span> <code class="parameter">$iterator</code></span> [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$flags</code><span class="initializer"> = self::CALL_TOSTRING</span></span> ] )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">int</span> <span class="methodname"><a href="cachingiterator.count.html" class="methodname">count</a></span> ( <span class="methodparam">void</span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.current.html" class="methodname">current</a></span> ( <span class="methodparam">void</span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.getcache.html" class="methodname">getCache</a></span> ( <span class="methodparam">void</span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.getflags.html" class="methodname">getFlags</a></span> ( <span class="methodparam">void</span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">Iterator</span> <span class="methodname"><a href="cachingiterator.getinneriterator.html" class="methodname">getInnerIterator</a></span> ( <span class="methodparam">void</span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.hasnext.html" class="methodname">hasNext</a></span> ( <span class="methodparam">void</span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">scalar</span> <span class="methodname"><a href="cachingiterator.key.html" class="methodname">key</a></span> ( <span class="methodparam">void</span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.next.html" class="methodname">next</a></span> ( <span class="methodparam">void</span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.offsetexists.html" class="methodname">offsetExists</a></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$index</code></span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.offsetget.html" class="methodname">offsetGet</a></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$index</code></span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.offsetset.html" class="methodname">offsetSet</a></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$index</code></span> , <span class="methodparam"><span class="type">string</span> <code class="parameter">$newval</code></span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.offsetunset.html" class="methodname">offsetUnset</a></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$index</code></span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.rewind.html" class="methodname">rewind</a></span> ( <span class="methodparam">void</span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.setflags.html" class="methodname">setFlags</a></span> ( <span class="methodparam"><span class="type"><span class="type bitmask">bitmask</span></span> <code class="parameter">$flags</code></span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.tostring.html" class="methodname">__toString</a></span> ( <span class="methodparam">void</span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="cachingiterator.valid.html" class="methodname">valid</a></span> ( <span class="methodparam">void</span> )</div> }</div> </div> <div class="section" id="cachingiterator.constants"> <h2 class="title">Predefined Constants</h2> <dl> <dt id="cachingiterator.constants.call-tostring"> <span class="term"><strong><code>CachingIterator::CALL_TOSTRING</code></strong></span> <dd> <p class="para">Convert every element to string.</p> </dd> </dt> <dt id="cachingiterator.constants.catch-get-child"> <span class="term"><strong><code>CachingIterator::CATCH_GET_CHILD</code></strong></span> <dd> <p class="para">Don't throw exception in accessing children.</p> </dd> </dt> <dt id="cachingiterator.constants.tostring-use-key"> <span class="term"><strong><code>CachingIterator::TOSTRING_USE_KEY</code></strong></span> <dd> <p class="para"> Use <a href="cachingiterator.key.html" class="link">key</a> for conversion to string. </p> </dd> </dt> <dt id="cachingiterator.constants.tostring-use-current"> <span class="term"><strong><code>CachingIterator::TOSTRING_USE_CURRENT</code></strong></span> <dd> <p class="para"> Use <a href="cachingiterator.current.html" class="link">current</a> for conversion to string.</p> </dd> </dt> <dt id="cachingiterator.constants.tostring-use-inner"> <span class="term"><strong><code>CachingIterator::TOSTRING_USE_INNER</code></strong></span> <dd> <p class="para"> Use <a href="cachingiterator.getinneriterator.html" class="link">inner</a> for conversion to string. </p> </dd> </dt> <dt id="cachingiterator.constants.full-cache"> <span class="term"><strong><code>CachingIterator::FULL_CACHE</code></strong></span> <dd> <p class="para">Cache all read data.</p> </dd> </dt> </dl> </div> </div> <h2>Table of Contents</h2><ul class="chunklist chunklist_reference"><li><a href="cachingiterator.construct.html">CachingIterator::__construct</a> — Construct a new CachingIterator object for the iterator.</li><li><a href="cachingiterator.count.html">CachingIterator::count</a> — The number of elements in the iterator</li><li><a href="cachingiterator.current.html">CachingIterator::current</a> — Return the current element</li><li><a href="cachingiterator.getcache.html">CachingIterator::getCache</a> — The getCache purpose</li><li><a href="cachingiterator.getflags.html">CachingIterator::getFlags</a> — Get flags used</li><li><a href="cachingiterator.getinneriterator.html">CachingIterator::getInnerIterator</a> — Returns the inner iterator</li><li><a href="cachingiterator.hasnext.html">CachingIterator::hasNext</a> — Check whether the inner iterator has a valid next element</li><li><a href="cachingiterator.key.html">CachingIterator::key</a> — Return the key for the current element</li><li><a href="cachingiterator.next.html">CachingIterator::next</a> — Move the iterator forward</li><li><a href="cachingiterator.offsetexists.html">CachingIterator::offsetExists</a> — The offsetExists purpose</li><li><a href="cachingiterator.offsetget.html">CachingIterator::offsetGet</a> — The offsetGet purpose</li><li><a href="cachingiterator.offsetset.html">CachingIterator::offsetSet</a> — The offsetSet purpose</li><li><a href="cachingiterator.offsetunset.html">CachingIterator::offsetUnset</a> — The offsetUnset purpose</li><li><a href="cachingiterator.rewind.html">CachingIterator::rewind</a> — Rewind the iterator</li><li><a href="cachingiterator.setflags.html">CachingIterator::setFlags</a> — The setFlags purpose</li><li><a href="cachingiterator.tostring.html">CachingIterator::__toString</a> — Return the string representation of the current element</li><li><a href="cachingiterator.valid.html">CachingIterator::valid</a> — Check whether the current element is valid</li></ul> </div> <hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="arrayiterator.valid.html">ArrayIterator::valid</a></div> <div class="next" 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