防止number_format从舍入数字 - 添加逗号并保持小数点 - PHP

Question

Number format adds the commas I want but removes the decimals.

echo number_format("1000000.25");

This returns 1,000,000

I want it to return 1,000,000.25

I need both the commas and the decimals, without any number rounding. All my values are decimals. They vary in length.

Do I have to use something other than number format?

Answer 1

In case what you meant by they vary in length is related to the decimal part, take a look at this code:

function getLen($var){
    $tmp = explode('.', $var);
    if(count($tmp)>1){
        return strlen($tmp[1]);
    }
}
$var = '1000000.255555'; // '1000000.25'; // '1000000';
echo number_format($var, getLen($var));

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Some tests

• Output for 1000000.255555 :

1,000,000.255555

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Output for 1000000.25 :

1,000,000.25

---

Output for 1000000 :

1,000,000

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It counts how many chars there are after the . and uses that as argument in the number_format function;

Otherwise just use a constant number instead of the function call.

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And some reference...

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From the manual -> number_format() :

 string number_format ( float $number [, int $decimals = 0 ] ) 

And you can see in the description that

number
The number being formatted.

decimals
Sets the number of decimal points.

And a bit more:

[...]If two parameters are given, number will be formatted with decimals decimals with a dot (".") in front, and a comma (",") between every group of thousands.

Answer 2

$number = '1000000.25';
echo number_format($number, strlen(substr(strrchr($number, "."), 1)));

Explanation : Number Format takes a second parameter which specifies the number of decimal places required as pointed out in the docs . This Stack overflow answer tells you how to get the number of decimal places of your provided string

Answer 3

The docs for number_format() indicate the second parameter is used to specify decimal:

echo number_format('1000000.25', 2);

Ref: http://php.net/manual/en/function.number-format.php