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It is typical that simple decimal fractions like 0.1
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set_time_limit(0);
echo '<h2>ÕýÔÚ°²×°£¬ÇëÉÔºó...</h2>',
'<div style="border:1px solid #000;width:500px;"><div id="progress_bar">loading...</div></div>';
for($i=1;$i<=100;$i++){
$width = '500';
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