PHP マニュアル
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# fprintf

(PHP 5)

fprintf -- Write a formatted string to a stream

## Description

int fprintf ( resource handle, string format [, mixed args [, mixed ...]])

Write a string produced according to format to the stream resource specified by handle. format is described in the documentation for sprintf().

Returns the length of the outputted string.

See also: printf(), sprintf(), sscanf(), fscanf(), vsprintf(), and number_format().

## Examples

例 1. fprintf(): zero-padded integers

`<?php if (!($fp = fopen('date.txt', 'w'))) return; fprintf($fp, "%04d-%02d-%02d", $year, $month, $day); // will write the formatted ISO date to date.txt ?>`

例 2. fprintf(): formatting currency

`<?php if (!($fp = fopen('currency.txt', 'w'))) return; $money1 = 68.75; $money2 = 54.35; $money = $money1 + $money2; // echo $money will output "123.1"; $len = fprintf($fp, '%01.2f', $money); // will write "123.10" to currency.txt echo "wrote $len bytes to currency.txt"; // use the return value of fprintf to determine how many bytes we wrote ?>`

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