Summary of methods for intercepting float strings in php rounding

There are roughly the following methods to intercept floating point in php. For more information, see php. FloatThere are roughly the following methods:

1. float round (float $ val [, int $ precision]) returns the result of rounding val based on the specified precision (number of digits after 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 formatted data string.

$ A = 12.338938438; echo sprintf ("%. 5f ", $ a) // Result: 12.33894 $ a = 12.3312356; echo sprintf (" %. 5f ", $ a); // 12.33124 echo sprintf (" % f ", $ a); // 331236 the default value is 6 digits after the decimal point.

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

$number = 1234.5678; $english_format_number = number_format($number, 2, '.', ''); echo  $english_format_number ; // 1234.57

All of the above are automatically rounded down. sometimes the demand does not need to be rounded down. what should I do? I didn't think of a good solution. who knows I can tell you.

I wrote a troublesome function and recorded it.

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

For more information about the methods of intercepting float strings in php float, refer to the Chinese PHP website!

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