Write the formatted string into a variable:
<?php$number = 9;$str = "Beijing";$txt = vsprintf("There are %u million bicycles in %s.",array($number,$str));echo $txt;?>The vsprintf() function writes the formatted string into a variable.
Unlike sprintf(), the arguments in vsprintf() are in an array. Array elements will be inserted into the main string at the percent sign (%). This function is executed step by step. At the first % sign, the first array element is inserted, at the second % sign, the second array element is inserted, and so on.
Note: If there are more % symbols than arg parameters, you must use placeholders. The placeholder is inserted after the % symbol and consists of a number and "$". See Example 2.
Tip: Related functions: fprintf(), vfprintf(), printf(), sprintf(), and vprintf()
vsprintf( format,argarray )
| parameter | describe |
|---|---|
| format | Required. Specifies a string and how variables within it should be formatted. Possible format values: %% - returns a percent sign % %b - binary number %c - the character corresponding to the ASCII value %d - decimal number with sign (negative, 0, positive) %e - Use lowercase scientific notation (e.g. 1.2e+2) %E - Use uppercase scientific notation (e.g. 1.2E+2) %u - Decimal number without sign (greater than or equal to 0) %f - floating point number (local setting) %F - floating point number (non-native setting) %g - the shorter version of %e and %f %G - shorter %E and %f %o - octal number %s - string %x - hexadecimal number (lowercase letters) %X - hexadecimal number (uppercase letters) Additional format values. Must be placed between % and a letter (e.g. %.2f): + (Add + or - in front of a number to define the sign of the number. By default, only negative numbers are marked, and positive numbers are not marked) ' (Specifies what to use as padding, defaults to spaces. It must be used with a width specifier. For example: %'x20s (use "x" as padding)) - (left adjustment variable value) [0-9] (specifies the minimum width of the variable value) .[0-9] (specifies the number of decimal places or the maximum string length) Note: If multiple above format values are used, they must be used in the order above and cannot be disrupted. |
| argarray | Required. An array with parameters that will be inserted into the format string at % symbols. |
| Return value: | Returns an array value as a formatted string. |
|---|---|
| PHP version: | 4.1.0+ |
Use the format value %f:
<?php$num1 = 123;$num2 = 456;$txt = vsprintf("%f%f",array($num1,$num2));echo $txt;?>Use placeholders:
<?php$number = 123;$txt = vsprintf("With 2 decimals: %1$.2f<br>With no decimals: %1$u",array($number));echo $txt;?>Use sprintf() to demonstrate all possible format values:
<?php$num1 = 123456789;$num2 = -123456789;$char = 50; // The ASCII Character 50 is 2// Note: The format value "%%" returns a percent signecho sprintf("%%b = % b",$num1)."<br>"; // Binary numberecho sprintf("%%c = %c",$char)."<br>"; // The ASCII Characterecho sprintf("%%d = %d",$num1)."<br>"; // Signed decimal numberecho sprintf("%% d = %d",$num2)."<br>"; // Signed decimal numberecho sprintf("%%e = %e",$num1)."<br>"; // Scientific notation (lowercase)echo sprintf("%%E = %E",$num1)."<br>"; // Scientific notation (uppercase)echo sprintf("%%u = %u",$num1)."< br>"; // Unsigned decimal number (positive)echo sprintf("%%u = %u",$num2)."<br>"; // Unsigned decimal number (negative)echo sprintf("%%f = %f",$num1)."<br>"; // Floating-point number (local settings aware)echo sprintf("%%F = %F",$num1)."< br>"; // Floating-point number (not local sett aware)echo sprintf("%%g = %g",$num1)."<br>"; // Shorter of %e and %fecho sprintf("%%G = %G",$num1)."<br>"; // Shorter of %E and %fecho sprintf("%%o = %o",$num1)."<br>" ; // Octal numberecho sprintf("%%s = %s",$num1)."<br>"; // Stringecho sprintf("%%x = %x",$num1)."<br>"; // Hexadecimal number (lowercase)echo sprintf("%%X = %X",$num1)."<br>"; // Hexadecimal number (uppercase)echo sprintf("%%+d = %+d", $num1)."<br>"; // Sign specifier (positive)echo sprintf("%%+d = %+d",$num2)."<br>"; // Sign specifier (negative)?>Demonstration of string specifiers:
<?php$str1 = "Hello";$str2 = "Hello world!";echo vsprintf("[%s]",array($str1))."<br>";echo vsprintf("[%8s] ",array($str1))."<br>";echo vsprintf("[%-8s]",array($str1))."<br>";echo vsprintf("[%08s]",array($str1))."<br>"; echo vsprintf("[%'*8s]",array($str1))."<br>";echo vsprintf( "[%8.8s]",array($str2))."<br>"; ?>