Php float data application details

Source: Internet
Author: User
Tags mixed php tutorial sprintf strlen

Php Tutorial float data application details

1 float round (float $ val [, int $ precision]) returns the result of rounding val according to 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

View sourceprint? $ 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)

View sourceprint? $ 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.

View sourceprint? 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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