Summary of methods for intercepting floating-point strings without rounding in php float_PHP Tutorial

There are roughly the following methods for intercepting floating point types in php:

1, float round ( float $val [, int $precision ] ) Returns val rounded to the specified precision (the number of decimal digits after the decimal point). precision can also be negative or zero (default).

echo round(4.3) //4

2, string sprintf ( string $format [, mixed $args [, mixed $... ]] ) returns the string of formatted data

Copy code The code is as follows:

$a=12.338938438;
echo sprintf("%.5f",$a) //Result: 12.33894

$a=12.3312356;
echo sprintf("%.5f",$a);//12.33124
echo sprintf("%f",$a);//331236 Default 6 decimal places

3, string number_format ( float $number , int $decimals , string $dec_point , string $thousands_sep )

Copy code The code is as follows:

$number = 1234.5678;

$english_format_number = number_format($number, 2, '.', '');
echo $english_format_number; // 1234.57

The above are automatically rounded. Sometimes rounding is not required. What should I do? I haven’t thought of a good way. Who knows can tell me.

I wrote a troublesome function myself and recorded it

Copy the code The code is as follows:

function getFloatValue($ f,$len)
{
$tmpInt=intval($f);

$tmpDecimal=$f-$tmpInt;
$str="$tmpDecimal";
$subStr=strstr($str,'.');
if(strlen($subStr)<$len+1)
{
$repeatCount=$len+1-strlen($subStr) ;
$str=$str."".str_repeat("0",$repeatCount);

}

return $tmpInt."".substr($str,1, 1+$len);

}
echo getFloatValue(12.99,4) //12.9900
echo getFloatValue(12.9232555553239,4) //12.9232

http://www.bkjia.com/PHPjc/824906.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/824906.htmlTechArticleThere are roughly the following methods to intercept floating point types in PHP: 1. float round (float $val [, int $precision ] ) returns the value of val according to the specified precision (the number of decimal digits after the decimal point...