PHP output formatted string function vprintf ()

Instance

Output formatted string:

<?php$number = 9; $str = "Beijing"; vprintf ("There is%u million bicycles in%s.", Array ($number, $str)); >

Definition and usage

The vprintf () function outputs a formatted string.

Unlike printf (), the parameters in vprintf () are in the array. The array elements are inserted into the percent sign (%) symbol in the main string. This function is executed step-by. At the first% symbol, insert the first array element, insert the second array element at the second% symbol, and so on.

Note: If the% symbol is more than the arg parameter, you must use a placeholder. Placeholders are inserted after the% symbol, consisting of numbers and "\$". See Example 2.

Tip: Related functions: sprintf (), printf (), vsprintf (), fprintf (), and vfprintf ()

Grammar

vprintf (Format,argarray)

Parameters	Describe
Format	Necessary. Specifies the string and how to format the variable. Possible format values: Percent percent-returns a percent semicolon% %b-Binary number The character that corresponds to the%C-ASCII value %d-decimal number with sign (negative, 0, positive) %e-Using the lowercase scientific notation (e.g. 1.2e+2) %E-Use uppercase scientific notation (e.g. 1.2E+2) %u-decimal number with no sign (greater than or equal to 0) %f-Floating point number (local setting) %F-Floating point number (non-local setting) %g-Shorter%e and%f %G-Shorter%E and%f %o-Eight binary number %s-String %x-16 binary number (lowercase letters) %x-16 decimal digits (uppercase letters) The attached format value. Must be placed between% and letter (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. ' (specifies what to use as a fill, the default is a space.) It must be used with the width of the specified device. For example:% ' x20s (using "X" as the fill)) -(left adjustment variable value) [0-9] (minimum width of the specified variable value) . [0-9] (Specify the number of decimal digits or the maximum string length) Note: If you use more than one of the above format values, they must be used in the order above and cannot be disrupted.
Argarray	Necessary. An array with parameters that are inserted into the% symbol in the format string.

Technical details

return value:	Returns the length of the string being output.
PHP version:	4.1.0+

More examples

Example 1

Use the format value%f:

<?PHP$NUM1 = 123; $num 2 = 456;vprintf ("%f%f", Array ($num 1, $num 2));? >

Example 2

Use placeholders:

<?php$number = 123;vprintf ("With 2 decimals:%1$.2f<br>with no decimals:%1$u", Array ($number));? >

Example 3

Use printf () to demonstrate all possible format values:

&LT;?PHP$NUM1 = 123456789; $num 2 = -123456789; $char = 50; The ASCII Character is 2//note:the format value "percent" returns a percent signprintf ("%%b =%b <br>", $num 1); Binary numberprintf ("%%c =%c <br>", $char); The ASCII characterprintf ("%%d =%d <br>", $num 1); Signed decimal numberprintf ("%%d =%d <br>", $num 2); Signed decimal numberprintf ("%%e =%e <br>", $num 1); Scientific notation (lowercase) printf ("%%e =%E <br>", $num 1); Scientific notation (uppercase) printf ("%%u =%u <br>", $num 1); Unsigned decimal number (positive) printf ("%%u =%u <br>", $num 2); Unsigned decimal number (negative) printf ("%%f =%f <br>", $num 1); Floating-point number (Local settings Aware) printf ("%%f =%F <br>", $num 1); Floating-point number (not local settings aware) printf ("%%g =%g <br>", $num 1); Shorter of%e and%fprintf ("%%g =%G <br>", $num 1); Shorter of%E and%fprintf ("%%o =%o <br>", $num 1); OctaL numberprintf ("%%s =%s <br>", $num 1); stringprintf ("%%x =%x <br>", $num 1); Hexadecimal number (lowercase) printf ("%%x =%x <br>", $num 1); Hexadecimal number (uppercase) printf ("%%+d =%+d <br>", $num 1); Sign specifier (positive) printf ("%%+d =%+d <br>", $num 2); Sign specifier (negative)?>

Example 4

A demo of the string specifier:

<?PHP$STR1 = "Hello"; $str 2 = "Hello world!"; vprintf ("[%s]<br>", Array ($str 1)), vprintf ("[%8s]<br>", Array ($str 1)), vprintf ("[%-8s]<br>", Array ($str 1)); vprintf ("[%08s]<br>", Array ($str 1)); vprintf ("[% ' *8s]<br>", Array ($str 1)), vprintf ("[%8.8s]<br>", Array ($str 2));?>