PHP 脚本执行内存使用大小

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<?php/*php内存使用机制Time 2014-06-04*/function convert($size){        $unit = array('b','kb','mb','gb','tb','pb');        return round($size/pow(1024,($i=floor(log($size,1024)))),2).' '.$unit[$i];}function curl_post($url, array $post = array(), array $options = array()){        $defaults = array(                        CURLOPT_POST => 1,                        CURLOPT_HEADER => 0,                        CURLOPT_URL => $url,                        CURLOPT_FRESH_CONNECT => 1,                        CURLOPT_RETURNTRANSFER => 1,                        CURLOPT_FORBID_REUSE => 1,                        CURLOPT_TIMEOUT => 4,                        CURLOPT_POSTFIELDS => http_build_query($post)        );        $ch = curl_init();        curl_setopt_array($ch, ($options + $defaults));        if( ! $result = curl_exec($ch))        {                trigger_error(curl_error($ch));        }        curl_close($ch);        return $result;}function start() {        $array = array();        for ($i = 1; $i <= 30; $i++) {                $array[] = $i.'<orders>    <order>        <orderid>E00000000001</orderid>        <callback>D_00001</callback>        <customerid>761342</customerid>        <mailno>1200000000001</mailno>        <sender>            <name>刘XX</name>            <company>韵达快运</company>            <city>上海市,青浦区</city>            <address>盈港东路6679号</address>            <postcode>201703</postcode>            <phone>021-12345678</phone>            <mobile>13812345678,13587654321</mobile>        </sender>        <receiver>            <name>张YY</name>            <company>缘港商务</company>            <city>广东省,广州市,天河区</city>            <address>帝王大厦5-12号</address>            <postcode>510520</postcode>            <phone>021-12345678</phone>            <mobile>13587654321</mobile>        </receiver>        <sendstarttime>2010-06-19 08:00:00</sendstarttime>        <sendendtime>2010-06-19 12:00:00</sendendtime>        <weight>0.753</weight>        <size>0.12,0.23,0.11</size>        <value>126.50</value>        <freight>8.00</freight>        <premium>1.00</premium>        <other_charges>0.00</other_charges>        <collection_currency>CNY</collection_currency>        <collection_value>155.50</collection_value>        <special>0</special>        <items>            <item>                <name>芭比闹钟</name>                <number>1</number>                <remark></remark>            </item>        </items>        <remark>包已打好</remark>    </order></orders>';        }                        foreach ($array as $value) {                $response = curl_post('http://127.0.0.1/demo/test/interface.php', array('data'=>$value));        }}$i = 5;while (true) {        echo convert(memory_get_usage()) . "--s--\n";        start();        echo convert(memory_get_usage()) . "--e--\n";        $i--;        if ($i < 1) {                break;        }}?>
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