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<?php
echo number_format("5000000")."<br>";
echo number_format("5000000",2)."<br>";
echo number_format("5000000",2,",",".");
?>

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number_format(number,decimals,decimalpoint,separator)
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number

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decimalpoint ¿ÉÑ¡¡£¹æ¶¨ÓÃ×÷СÊýµãµÄ×Ö·û´®¡£
separator

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<?php
$num = 4999.9;
$formattedNum = number_format($num)."<br>";
echo $formattedNum;
$formattedNum = number_format($num, 2);
echo $formattedNum;
?>

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