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PHP vfprintf() Function Usage and Example

　　 The vfprintf() function is used to write formatted strings to a specified output stream (such as a file or database).

Syntax

vfprintf(stream, format, argarray)

Definition and Usage

It is used to convert formatted strings to a specific output

Different from fprintf(), the parameters in vfprintf() are located in an array. The array elements will be inserted into the main string at the percentage (%) symbol. This function is executed step by step. At the first % symbol, the first array element is inserted, at the second % symbol, the second array element is inserted, and so on.

Note:If there are more % symbols than arg parameters, you must use placeholders. Placeholders are inserted after the % symbol, composed of numbers and "\$". See the example 2.

Tip:Related functions:fprintf(), printf(),sprintf(),vprintf() andvsprintf()

Return value

　Returns the length of the output string.

Parameter

Number	Parameters and descriptions
1	stream Required. Specify where to write/Output string
2	format Required. Specify the string and how to format the variables within it Possible format values: %% - Returns a percentage sign % %b - Binary number %c - Character corresponding to ASCII value %d - Decimal number with a sign (negative, 0, positive) %e - Use lowercase scientific notation (for example 1.2e+2 %E - Use uppercase scientific notation (for example 1.2E+2 㩵n - Decimal number without a sign (greater than or equal to 0) %f - Floating-point number (local settings) %F - Floating-point number (non-local settings) %g - Short %e and %f %G - Short %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 the letter (for example %.2f): + (Add + Or - To define the sign of the number. By default, only negative numbers are marked, and positive numbers are not marked) ' (Specify what to use as the fill, the default is a space. It must be used with the width specifier. For example: %'x20s(Use "x" as the fill) - (Left align the variable value) [0-9](Specify the minimum width of the variable value) ][0-9](Specify the number of decimal places or the maximum string length) Note:If multiple of the above format values are used, they must be used in the order specified above and cannot be mixed.
3	argarray Required. Used to specify the array of parameters to be inserted, which will be inserted into the format string at the % symbol position.

Online Example

Try the following example, write some text to a file:

Example

<?php
　　　//Write some text to a file:
　　　$input1　=　123;
　　　$input2　=　456;
　　　$file = fopen("sample.txt","r");
　　　
　　　vfprintf($file,"%f%f",array($input1$input2));
?>

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