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    SplFileObject::next

    (PHP 5 >= 5.1.0, PHP 7, PHP 8)

    SplFileObject::next — 次の行を読み出す

    説明

    public SplFileObject::next(): void

    ファイルの次の行に進みます。

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    値を返しません。

    例

    例1 SplFileObject::next() の例

    <?php
    // 行単位でファイルを読み込む
    $file = new SplFileObject("misc.txt");
    while (!    $file->eof()) {
    echo     $file->current();
    $file->next();
    }
    ?>

    参考

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    User Contributed Notes 2 notes

    up
    7
    Jonnycake
    10 years ago
    Quick note when using next(), it appears that you have to already be at the end of the line in order for it to hop to the next one. I realized this while attempting to do a lineCount implementaiton like the following:

    <?php
    function lineCount($file)
    {
    $x=0;
    while(!    $file->eof()) {
    $x++;
    $file->next();
    }
    return     $x;
    }
    $file=new SplFileObject("something");
    echo     lineCount($file);
    ?>

    It ended up in an infinite loop. The solution was to just call fgets()/current() in the loop, although it wasn't being used anywhere so the following works:

    <?php
    function lineCount($file)
    {
    $x=0;
    while(!    $file->eof()) {
    $file->current();
    $x++;
    $file->next();
    }
    return     $x;
    }
    $file=new SplFileObject("something");
    echo     lineCount($file);
    ?>
    up
    -3
    quijote dot shin at gmail dot com
    7 years ago
    As @Jonnycake pointed there is no documentation about the following behavior of next();

    You need to call current() to really move forward without the need of a source loop.

    Be:
    <?php
    $file     = new SplFileObject("file.txt");

    echo     PHP_EOL . $file->current();
    $file->next();
    $file->next();
    $file->next();
    echo     PHP_EOL . $file->current(); // 2nd line of the file

    ?>

    <?php
    $file     = new SplFileObject("file.txt");

    echo     PHP_EOL . $file->current();
    $file->next(); $file->current();
    $file->next(); $file->current();
    $file->next();
    echo     PHP_EOL . $file->current(); // be the 4th line of the file

    ?>

    Honestly, I don't know if it is waste of memory and/or CPU .
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