实践出php内存极限占用是多少.

<?php 
set_time_limit(0);

echo &#39;memory_limit:&#39;. $memory = ini_get(&#39;memory_limit&#39;).&#39;<br />&#39;;

$string = &#39;abcde&#39;;  // 运行字符串, 可修改这儿.
$memory =($memory+0)*1024*1024;
$runtime = memory_get_usage();
$runcount = $memory / (strlen($string)+1); // 为什么+1? 因为需要留点内存给其它变量或者计算式.
$i = 0;

while($i < $runcount){
    $i ++;
    $data .= $string;
}

echo &#39;all run count: &#39;.$i.&#39;<br />&#39;;
echo &#39;\$data string size:&#39;. sprintf(&#39;%01.2f&#39;,strlen($data) / 1024 / 1024) .&#39;MB <br />&#39;;
echo &#39;run memory: &#39;. sprintf(&#39;%01.2f&#39;,(memory_get_usage() - $runtime) / 1024 / 1024) .&#39;MB&#39;;
exit();