SplFileObject::next

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

    SplFileObject::next — Leer la siguiente línea

    Descripción

    public SplFileObject::next(): void

    Mover a la siguiente línea en el fichero.

    Parámetros

    Esta función no tiene parámetros.

    Valores devueltos

    No devuelve ningún valor.

    Ejemplos

    Ejemplo #1 Ejemplo de SplFileObject::next()

    <?php
    // Leer el fichero línea por línea
    $file = new SplFileObject("variado.txt");
    while (!    $file->eof()) {
    echo     $file->current();
    $file->next();
    }
    ?>

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    User Contributed Notes 2 notes

    up
    7
    Jonnycake
    9 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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