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Home Backend Development PHP Tutorial 循环大量数据导致内存超出,不增加内存如何解决该问题

循环大量数据导致内存超出,不增加内存如何解决该问题

Jun 23, 2016 pm 01:34 PM

我在生成HTML文件时,由于数据量较大,无数次的 fopen fwrite fclose,文件还没生成完呢,就提示内存超出。  
我的HTML生成方式是,读入缓存,再写入文件  

ob_start ();		
$temp = ob_get_contents ();		
ob_end_clean ();
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Copy after login


我unset(temp) 也不起作用,这个问题到底该怎么解决。不知那些CMS又是怎么生成HTML的,再大的数据也不会内存超出

回复讨论(解决方案)

不知道你的具体代码,不好说什么

需要及时释放工作变量,可将工作放在函数中执行,以利用 php 自己的回收机制
自己释放变量时需注意的是数组占用的内存是只增不减的,所以要注意数组的复用


我在生成HTML文件时,由于数据量较大,无数次的 fopen fwrite fclose,文件还没生成完呢,就提示内存超出。
我的HTML生成方式是,读入缓存,再写入文件

ob_start ();		
$temp = ob_get_contents ();		
ob_end_clean ();
Copy after login
Copy after login


我unset(temp) 也不起作用,这个问题到底该怎么解决。不知那些CMS又是怎么生成HTML的,再大的数据也不会内存超出


比如某个脚本为必须为死循环,那么循环到一定次数就会造成内存超出,如何控制每循环100次,释放内存

那你加个循环控制量就是了

PHP生成HTML,怎样才能让他内存不超出,求代码

周末休息没人回答了




我在生成HTML文件时,由于数据量较大,无数次的 fopen fwrite fclose,文件还没生成完呢,就提示内存超出。
我的HTML生成方式是,读入缓存,再写入文件

ob_start();		
$temp = ob_get_contents ();		
ob_end_clean ();
Copy after login


我unset(temp) 也不起作用,这个问题到底该怎么解决。不知那些CMS又是怎么生成HTML的,再大的数据也不会内存超出


比如某个脚本为必须为死循环,那么循环到一定次数就会造成内存超出,如何控制每循环100次,释放内存


$p = $_GET['p'] * 100;
for($i=$p; $i<$p+100; $i++){	e
cho $i;	echo &#39;<br>&#39;;	
// .....	
// 执行其他操作
}sleep(1);
?>
<script>
var p = GetQueryString(&#39;p&#39;);
p++;var url = window.location.href;
var new_url = url.replace(/\?p=(\d)+/, &#39;&#39;) + &#39;?p=&#39; + p;
window.location.href = new_url;
function GetQueryString(name){     
var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");     
var r = window.location.search.substr(1).match(reg);     
if(r!=null)return  unescape(r[2]); return null;}
</script>
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思路就是把大任务分批执行

用分页读取的方式。
加:register_shutdown_function
每页写完,自动header location到下一页。

用register_shutdown_function 的话,只要你打开了第一次,就可以关闭浏览器了,它会自动执行。

数据的最后一页写完了,要执行:die();

这种情况要分批执行,上个代码,你马上就明白其中的原理了

$total = 10;$s = 0;
if (isset ( $_GET [&#39;s&#39;] )) {        
$s = &$_GET [&#39;s&#39;];
}$per = $s + 5; 
// 每次循环5条if ($per > $total) {
 // 如果下次循环会超过总数,就让他只能循环到总数        
 $per = &$total;}while ( $s < $per ) {        
 echo ++ $s;        echo &#39;<br>&#39;;
 }
 echo &#39;<hr>&#39;;
 echo $s;if ($s < $total) {        
 echo "<script>window.location.href=&#39;?s=$s&#39;</script>";
 }
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