fprintf

(PHP 5)

fprintf — 将格式化后的字符串写入到流

说明

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

写入一个根据 format 格式化后的字符串到由 handle 句柄打开的流中。

参数

handle: 文件系统指针，是典型地由 fopen() 创建的 resource(资源)。
format: 参见 sprintf() 中对 format 的描述。
args
...

返回值

返回写入的字符串长度。

范例

Example #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
?>

Example #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
?>

参见

printf() - 输出格式化字符串
sprintf() - Return a formatted string
sscanf() - Parses input from a string according to a format
fscanf() - 从文件中格式化输入
vsprintf() - 返回格式化字符串
number_format() - Format a number with grouped thousands

add a note User Contributed Notes fprintf

jgbreezer at hotmail dot com 07-Sep-2006 07:14


Another alternative using sprintf and fwrite() for pre-v5 php's:



fwrite( resource, sprintf(format [, mixed args [, mixed ...]] ))



Barring slight logical differences in meaning of returned value and (maybe??) how it handles magic_quotes_runtime config option, see fwrite() help.

aidan at php dot net 30-May-2004 10:35


This functionality is now implemented in the PEAR package PHP_Compat.



More information about using this function without upgrading your version of PHP can be found on the below link:



http://pear.php.net/package/PHP_Compat

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