PHP sprintf ()

When writing PHP code, sometimes use the sprintf () function, then it is how to use it?

Learning Source:

Http://www.w3school.com.cn/php/func_string_sprintf.asp

My application in my project:

Used to put a few long select fields

So we write the SQL statements can be separate writing, separate look, very intuitive and convenient

Instance

Replace the percent sign (%) with a variable that is passed as a parameter:

<?php$number = 2; $str = "Shanghai"; $txt = sprintf ("There is%u million cars in%s.", $number, $STR); Echo $txt; >

Running an instance

Definition and usage

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

The arg1,arg2,+ + parameters are inserted into the percent sign (%) symbol in the main string. This function is executed step-by. At the first% symbol, insert arg1, insert arg2at the second% symbol, and so on.

Note: If the% symbol is more than the arg parameter, you must use a placeholder. The placeholder is located after the% symbol and consists of a number and a "\$". See Example 2.

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

• fprintf ()
• printf ()
• vfprintf ()
• vprintf ()
• vsprintf ()

Grammar

sprintf (format,arg1,arg2,arg++)

Parameters	Description
format	Required. Specifies the string and how to format the variable. Possible format values: %-Returns a percent semicolon% %b-binary %c-ascii value corresponding character %d-contains the decimal number of the sign (negative, 0, positive) %e-scientific notation using lowercase (e.g. 1.2e+2) % E-use uppercase scientific notation (e.g. 1.2E+2) li>%u-Unsigned decimal number (greater than or equal to 0) %f-floating-point number (local setting) % F-floating point (not local) %g-Shorter%e and%f %g-Shorter%E and%f %o-Eight decimal digits %s-string %x-16 decimal (lowercase) % x-16 Decimal (capital letter) the appended format value. Must be placed between the% and the letter (for example,%.2f): ' (specifies what to use as a fill, and the default is a space.) It must be used with the width of the specified device. For example:% ' x20s (with "x" as padding) -(left adjustment variable value) [0-9] (minimum width of the specified 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 above.
Arg1	Necessary. Specifies the parameter that is inserted into the first% symbol in the format string.
Arg2	Optional. Specifies the parameter that is inserted into the second% symbol in the format string.
arg++	Optional. Specifies the parameters that are inserted into the format string at the third to fourth-equal% symbol.

Technical details

return value:	Returns the formatted string.
PHP version:	4 +

More examples of examples 1

Use the format value%f:

<?php$number = 123; $txt = sprintf ("%f", $number); Echo $txt; >

PHP sprintf ()