PHP sprintf () format the output of the detailed ____php

I. Definition and usage

The sprintf () function writes the formatted string to the variable.

The Arg1, arg2, + + parameters are inserted into the main string at the percent sign (%) symbol. The function is executed incrementally. At the first% symbol, insert arg1, insert arg2 at the second% symbol, and so on.

Note: If the% symbol is greater than the ARG argument, you must use a placeholder. The placeholder is after the% symbol and consists of numbers and "\$." Example: <. PHP $number = 2; $STR = "Shanghai"; $txt = sprintf ("There are%u million cars in%s.", $number, $STR); Echo $txt?> Run the result is: There are 2 million cars in Shanghai. Grammar sprintf (format,arg1,arg2,arg++)

Parameters	Describe
Format	Necessary. Specify the string and how to format the variables therein. Possible format values:	Percent% return a percent percent %b binary number Character for%c ASCII value %d contains positive and negative decimal digits (negative, 0, positive numbers) %e uses the scientific notation of lowercase (for example: 1.2e+2) %E uses the scientific notation of uppercase (for example: 1.2E+2) %u does not contain a positive or negative decimal number (greater than or equal to 0) %f floating-point numbers (Local settings) %F floating-point number (not local setting) %g Shorter%e and%f %G Shorter%e and%f %o Octal number %s string %x hex Number (lowercase letter) %x Hex Number (uppercase letter) The attached format value. Must be placed between% and letters (e.g.%.2f): + (precede the number with + or-to define the positive and negative of the number.) By default, Only negative numbers are marked, positive numbers are not marked. ' (Specify what to use as padding, default is a space.) It must be with the width of the specified device Used together. For example:% ' x20s (using ' x as padding ') -(left to adjust the value of the variable) [0-9] (Specify the minimum width of the variable value) . [0-9] (Specify number of decimal digits or maximum string length) Note: If you use more than one of the above format values, they must be used in the order listed above.
Arg1	Necessary. Specify the parameter to be inserted into the first% symbol in the format string.
Arg2	Optional. Specify the parameter to be inserted into the second% symbol in the format string.
arg++	Optional. Specify the parameters to be inserted into the format string at the third to fourth% symbol.

Technical details:
Return value: Returns a formatted string Ii. More examples

1. Use format value%f:

<?php

$number = 123;

$txt = sprintf ("%f", $number);

Echo $txt;

?>

The results of the operation are: 123.000000

2. Use the occupancy character:

<?php

$number = 123;

$txt = sprintf ("With two decimal:%\$.2f<br> without decimals:%1\ $u", $number);

Echo $txt;

?>

Run as: With two decimal: 123.00

Without decimal: 123

3. Demo of all possible format values

<?php

$num 1 = 123456789;

$num 2 =-123456789;

$char = 50; ASCII character 50 is 2

Note: The format value "%" returns the percent sign

Echo sprintf ("%%b =%b", $num 1). "  <br> "; Binary number result:%b = 111010110111100110100010101

Echo sprintf ("%%c =%c", $char). "  <br> "; ASCII character result:%c = 2

Echo sprintf ("%%d =%d", $num 1). "  <br> "; Signed decimal number result:%d = 123456789

Echo sprintf ("%%d =%d", $num 2). "  <br> "; Signed decimal number result:%d =-123456789

Echo sprintf ("%%e =%e", $num 1). "  <br> "; Scientific notation (lowercase) results:%e = 1.234568e+8

Echo sprintf ("%%e =%E", $num 1). " <br> "//Scientific counting method (upper case) Result:%E = 1.234568E+8

Echo sprintf ("%%u =%u", $num 1). " <br>//unsigned decimal number (positive) Result:%u = 123456789

Echo sprintf ("%%u =%u", $num 2). " <br>//unsigned decimal number (negative) Result:%u = 4171510507

Echo sprintf ("%%f =%f", $num 1). " <br>//floating-point number (depending on local settings) Result:%f = 123456789.000000
Echo sprintf ("%%f =%F", $num 1). " <br>//floating-point number (does not view local setting) Result:%F = 123456789.000000

Echo sprintf ("%%g =%g", $num 1). " <br> "//shorter than%e and%f results:%g = 1.23457e+8

Echo sprintf ("%%g =%G", $num 1). " <br> "//shorter than%e and%f results:%G = 1.23457E+8

Echo sprintf ("%%o =%o", $num 1). " <br> "//octal number results:%o = 726746425

Echo sprintf ("%%s =%s", $num 1). " <br>//String Result:%s = 123456789

Echo sprintf ("%%x =%x", $num 1). " <br>//16 (lowercase) Result:%x = 75bcd15

Echo sprintf ("%%x =%x", $num 1). " <br>//16 (upper case) Result:%x = 75bcd15

Echo sprintf ("%%+d =%+d", $num 1). " <br>//symbol specifier (positive) Result:%+d = +123456789

Echo sprintf ("%%+d =%+d", $num 2). " <br>//symbol specifier (negative) Result:%+d =-123456789

?>
4. Demo of the string descriptor <?php

$str 1 = "Hello";

$str 2 = "Hello World";

Echo sprintf ("[%s]", $str 1. " <br> ");

Echo sprintf ("[%8s]", $str 1. " <br> ");

Echo sprintf ("[%-8s]", $str 1. " <br> ");

Echo sprintf ("[%08s]", $str 1. " <br> ");

Echo sprintf ("[% ' *8s]", $str 1. " <br> ");

Echo sprintf ("[%8.8s]", $str 2. " <br> ");
?>
Run results: [Hello]                       [Hello]                       [Hello]                       [000Hello]                       [***hello]                       [Hello wo]
















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