PHP float does not round up the method of intercepting floating-point string

There are several ways to intercept floating-point types in PHP. Need friends can come to the reference, I hope to help you

There are several ways to intercept floating-point types in PHP:

1, float round (float $val [, int $precision]) Returns the result of rounding Val based on the specified precision precision (number of digits after decimal decimal point). Precision can also be negative or 0 (the default value).

echo round (4.3)//4

2 . String sprintf (String $format [, Mixed $args [, mixed $ ...]) returns the formatted data strings

$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 digits after 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 these are automatically rounded, sometimes demand does not need to be rounded up, how to do, did not think of a good way, who know can tell a sound.

I wrote a trouble-point 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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