php float method to intercept floating point string without rounding

There are roughly the following methods to intercept floating point types in php. Friends in need can come here for reference, I hope it will be helpful to everyone

There are roughly the following methods to intercept floating point types in php:

1, float round ( float $val [, int $precision ] ) returns the result of rounding val according 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 $... ]] ) return String of formatted data

$a=12.338938438; 
echo sprintf("%.5f",$a) //结果：12.33894  
$a=12.3312356; 
echo sprintf("%.5f",$a);//12.33124 
echo sprintf("%f",$a);//331236  默认小数点后6位

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 Automatic rounding is done. 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 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

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