php大数字格式化，大数据格式化，科学计数法，长数字格式化，函数number_format

<?php
$num = 115101972680109923367112264172910153889322104;
echo $num;
echo "<br/>";
echo number_format($num);
echo "<br/>";
echo number_format($num,2);
echo "<br/>";
echo number_format($num,2,",",".");
echo "<br/>";
echo number_format($num,0,"","");

?>

以上方法得到的结果:

1.1510197268011E+44
115,101,972,680,109,927,252,026,068,279,820,396,817,022,976
115,101,972,680,109,927,252,026,068,279,820,396,817,022,976.00
115.101.972.680.109.927.252.026.068.279.820.396.817.022.976,00
115101972680109927252026068279820396817022976

官方函数地址：http://php.net/manual/zh/function.number-format.php