PHP文件缓存包含三种格式
PHP文件缓存内容保存格式主要有三种:
1.变量 var_export 格式化成PHP正常的赋值书写格式,用的时候直接include文件
2.变量 serialize 序列化之后保存,用的时候反序列化
3,变量 json_encode格式化之后保存,用的时候json_decode
一直以来,我都以为第一种效率最高,因为那是PHP脚本解释器解析PHP脚本的格式,原生的,应该最快,至少读取缓存的效率应该是最高的,可是今天做了个测试,令我大跌眼镜!原来 serialize序列化效率才是最高的,不论是读还是写!
下面是用来测试的PHP文件缓存的代码:
<ol class="dp-xml"> <li class="alt"><span><span>view plaincopy to clipboardprint? </span></span></li> <li> <span>$</span><span class="attribute">st</span><span> = </span><span class="attribute-value">microtime</span><span>(1); </span> </li> <li class="alt"> <span>for ($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">1000</span><span>;$i++){ </span></span> </li> <li><span>/* </span></li> <li class="alt"> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">var_export</span><span>($_SERVER,1); </span> </li> <li> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">""</span><span>; </span> </li> <li class="alt"><span>file_put_contents("data/in.php",$file); </span></li> <li><span>*/ </span></li> <li class="alt"><span>include("data/in.php"); </span></li> <li><span>} </span></li> <li class="alt"><span>echo "include读:".(microtime(1)-$st)." "; </span></li> <li> <span>$</span><span class="attribute">st</span><span> = </span><span class="attribute-value">microtime</span><span>(1); </span> </li> <li class="alt"> <span>for ($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">1000</span><span>;$i++){ </span></span> </li> <li> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_put_contents</span><span>("data/se.php" </span> </li> <li class="alt"><span>,serialize($_SERVER)); </span></li> <li> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_get_contents</span><span>("data/se.php"); </span> </li> <li class="alt"> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">unserialize</span><span>($file); </span> </li> <li><span>} </span></li> <li class="alt"><span>echo "serialize写:".(microtime(1)-$st)." "; </span></li> <li> <span>$</span><span class="attribute">st</span><span> = </span><span class="attribute-value">microtime</span><span>(1); </span> </li> <li class="alt"> <span>for ($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">1000</span><span>;$i++){ </span></span> </li> <li> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_put_contents</span><span>("data/se. </span> </li> <li class="alt"><span>php",serialize($_SERVER)); </span></li> <li> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_get_contents</span><span>("data/se.php"); </span> </li> <li class="alt"> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">unserialize</span><span>($file); </span> </li> <li><span>} </span></li> <li class="alt"><span>echo "serialize读:".(microtime(1)-$st)." "; </span></li> <li> <span>$</span><span class="attribute">st</span><span> = </span><span class="attribute-value">microtime</span><span>(1); </span> </li> <li class="alt"> <span>for ($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">1000</span><span>;$i++){ </span></span> </li> <li> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_put_contents</span><span>("data/js.php </span> </li> <li class="alt"><span>",json_encode($_SERVER)); </span></li> <li> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_get_contents</span><span>("data/js.php"); </span> </li> <li class="alt"> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">json_decode</span><span>($file); </span> </li> <li><span>} </span></li> <li class="alt"><span>echo "json写:".(microtime(1)-$st)." "; </span></li> <li> <span>$</span><span class="attribute">st</span><span> = </span><span class="attribute-value">microtime</span><span>(1); </span> </li> <li class="alt"> <span>for ($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">1000</span><span>;$i++){ </span></span> </li> <li> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_put_contents</span><span>("data/js. </span> </li> <li class="alt"><span>php",json_encode($_SERVER)); </span></li> <li> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_get_contents</span><span>("data/js.php"); </span> </li> <li class="alt"> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">json_decode</span><span>($file); </span> </li> <li><span>} </span></li> <li class="alt"><span>echo "json读:".(microtime(1)-$st)." "; </span></li> <li> <span>$</span><span class="attribute">st</span><span> = </span><span class="attribute-value">microtime</span><span>(1); </span> </li> <li class="alt"> <span>for ($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">1000</span><span>;$i++){ </span></span> </li> <li><span>/* </span></li> <li class="alt"> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">var_export</span><span>($_SERVER,1); </span> </li> <li> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">""</span><span>; </span> </li> <li class="alt"><span>file_put_contents("data/in.php",$file); </span></li> <li><span>*/ </span></li> <li class="alt"><span>include("data/in.php"); </span></li> <li><span>} </span></li> <li class="alt"><span>echo "include读:".(microtime(1)-$st)." "; </span></li> <li> <span>$</span><span class="attribute">st</span><span> = </span><span class="attribute-value">microtime</span><span>(1); </span> </li> <li class="alt"> <span>for ($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">1000</span><span>;$i++){ </span></span> </li> <li> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_put_contents</span><span>("data/se. </span> </li> <li class="alt"><span>php",serialize($_SERVER)); </span></li> <li> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_get_contents</span><span>("data/se.php"); </span> </li> <li class="alt"> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">unserialize</span><span>($file); </span> </li> <li><span>} </span></li> <li class="alt"><span>echo "serialize写:".(microtime(1)-$st)." "; </span></li> <li> <span>$</span><span class="attribute">st</span><span> = </span><span class="attribute-value">microtime</span><span>(1); </span> </li> <li class="alt"> <span>for ($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">1000</span><span>;$i++){ </span></span> </li> <li> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_put_contents</span><span>("data/se. </span> </li> <li class="alt"><span>php",serialize($_SERVER)); </span></li> <li> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_get_contents</span><span>("data/se.php"); </span> </li> <li class="alt"> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">unserialize</span><span>($file); </span> </li> <li><span>} </span></li> <li class="alt"><span>echo "serialize读:".(microtime(1)-$st)." "; </span></li> <li> <span>$</span><span class="attribute">st</span><span> = </span><span class="attribute-value">microtime</span><span>(1); </span> </li> <li class="alt"> <span>for ($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">1000</span><span>;$i++){ </span></span> </li> <li> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_put_contents</span><span>("data/js. </span> </li> <li class="alt"><span>php",json_encode($_SERVER)); </span></li> <li> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_get_contents</span><span>("data/js.php"); </span> </li> <li class="alt"> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">json_decode</span><span>($file); </span> </li> <li><span>} </span></li> <li class="alt"><span>echo "json写:".(microtime(1)-$st)." "; </span></li> <li> <span>$</span><span class="attribute">st</span><span> = </span><span class="attribute-value">microtime</span><span>(1); </span> </li> <li class="alt"> <span>for ($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>;$i</span><span class="tag"><span class="tag-name">1000</span><span>;$i++){ </span></span> </li> <li> <span>//$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_put_contents</span><span>("data/js. </span> </li> <li class="alt"><span>php",json_encode($_SERVER)); </span></li> <li> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">file_get_contents</span><span>("data/js.php"); </span> </li> <li class="alt"> <span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">json_decode</span><span>($file); </span> </li> <li><span>} </span></li> <li class="alt"><span>echo "json读:".(microtime(1)-$st)." "; </span></li> </ol>
结果太神奇了!include写:0.559882879257include读:0.185745000839serialize写:0.255033969879serialize读:0.0853068828583json写:0.284864902496json读:0.145938873291 序列化是最快,无论读或写,都是第一种的效率的两倍,json比序列化的PHP文件缓存效率稍低,表现还可以!
如果撇开文件读写所耗费的时间,他们的效率差别可能会更大!include那个,虽然是PHP脚本赋值的格式,但是也是要分析解析文本,PHP脚本解释器需要动用整个解释器分析PHP脚本,而序列化不需要,只用启用序列化文本分析就行了,所以PHP文件缓存效率更高。

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