📄 function.memcache-decrement.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Decrement item's 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.memcache-debug.html">memcache_debug</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.memcache-delete.html">Memcache::delete</a></div> <div class="up"><a href="ref.memcache.html">Memcache Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.memcache-decrement" class="refentry"> <div class="refnamediv"> <h1 class="refname">Memcache::decrement</h1> <p class="verinfo">(PECL memcache:0.2-2.1.2)</p><p class="refpurpose"><span class="refname">Memcache::decrement</span> — <span class="dc-title">Decrement item's value</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>Memcache::decrement</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$key</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$value</tt></span> ] )</div> <p class="para rdfs-comment"> <b>Memcache::decrement()</b> decrements value of the item by <i><tt class="parameter">value</tt></i>. Similarly to <a href="function.memcache-increment.html" class="function">Memcache::increment()</a>, current value of the item is being converted to numerical and after that <i><tt class="parameter">value</tt></i> is substracted. <blockquote><p><b class="note">Note</b>: New item's value will not be less than zero. <br /> </p></blockquote> <blockquote><p><b class="note">Note</b>: Do not use <b>Memcache::decrement()</b> with item, which was stored compressed, because consequent call to <a href="function.memcache-get.html" class="function">Memcache::get()</a> will fail. <br /> </p></blockquote> <b>Memcache::decrement()</b> <em class="emphasis">does not</em> create an item if it didn't exist. Also you can use <b>memcache_decrement()</b> function. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">key</tt></i></span> <dd> <p class="para"> Key of the item do decrement. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">value</tt></i></span> <dd> <p class="para"> Decrement the item by <i><tt class="parameter">value</tt></i>. Optional and defaults to 1. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns item's new value on success or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>Memcache::decrement()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">/* procedural API */<br /></span><span style="color: #0000BB">$memcache_obj </span><span style="color: #007700">= </span><span style="color: #0000BB">memcache_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'memcache_host'</span><span style="color: #007700">, </span><span style="color: #0000BB">11211</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/* decrement item by 2 */<br /></span><span style="color: #0000BB">$new_value </span><span style="color: #007700">= </span><span style="color: #0000BB">memcache_decrement</span><span style="color: #007700">(</span><span style="color: #0000BB">$memcache_obj</span><span style="color: #007700">, </span><span style="color: #DD0000">'test_item'</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* OO API */<br /></span><span style="color: #0000BB">$memcache_obj </span><span style="color: #007700">= new </span><span style="color: #0000BB">Memcache</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$memcache_obj</span><span style="color: #007700">-></span><span style="color: #0000BB">connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'memcache_host'</span><span style="color: #007700">, </span><span style="color: #0000BB">11211</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/* decrement item by 3 */<br /></span><span style="color: #0000BB">$new_value </span><span style="color: #007700">= </span><span style="color: #0000BB">$memcache_obj</span><span style="color: #007700">-></span><span style="color: #0000BB">decrement</span><span style="color: #007700">(</span><span style="color: #DD0000">'test_item'</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.memcache-increment.html" class="function" rel="rdfs-seeAlso">Memcache::increment()</a></li> <li class="member"><a href="function.memcache-replace.html" class="function" rel="rdfs-seeAlso">Memcache::replace()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.memcache-debug.html">memcache_debug</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.memcache-delete.html">Memcache::delete</a></div> <div class="up"><a href="ref.memcache.html">Memcache Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -