PHP 7.0.6 Released

    fprintf

    (PHP 5, PHP 7)

    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.

    Parameters

    handle

    A file system pointer resource that is typically created using fopen().

    format

    See sprintf() for a description of format.

    args

    ...

    Return Values

    Returns the length of the string written.

    Examples

    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
    ?>

    See Also

    • printf() - Output a formatted string
    • sprintf() - Return a formatted string
    • sscanf() - Parses input from a string according to a format
    • fscanf() - Parses input from a file according to a format
    • vsprintf() - Return a formatted string
    • number_format() - Format a number with grouped thousands

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