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    imageflip

    (PHP 5 >= 5.5.0, PHP 7, PHP 8)

    imageflip — Flips an image using a given mode

    Beschreibung

    imageflip(GdImage $image, int $mode): bool

    Flips the image image using the given mode.

    Parameter-Liste

    image

    Ein GdImage-Objekt, das von einer der Funktionen zur Bilderzeugung, z. B. imagecreatetruecolor(), zurückgegeben wurde.

    mode

    Flip mode, this can be one of the IMG_FLIP_* constants:

    Constant Meaning
    IMG_FLIP_HORIZONTAL Flips the image horizontally.
    IMG_FLIP_VERTICAL Flips the image vertically.
    IMG_FLIP_BOTH Flips the image both horizontally and vertically.

    Rückgabewerte

    Gibt bei Erfolg true zurück. Bei einem Fehler wird false zurückgegeben.

    Changelog

    Version Beschreibung
    8.0.0 image erwartet nun eine GdImage-Instanz; vorher wurde eine gültige gd-Ressource erwartet.

    Beispiele

    Beispiel #1 Flips an image vertically

    This example uses the IMG_FLIP_VERTICAL constant.

    <?php
    // File
    $filename = 'phplogo.png';

    // Content type
    header('Content-type: image/png');

    // Load
    $im = imagecreatefrompng($filename);

    // Flip it vertically
    imageflip($im, IMG_FLIP_VERTICAL);

    // Output
    imagejpeg($im);
    imagedestroy($im);
    ?>

    Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    Output of example: Vertically flipped image

    Beispiel #2 Flips the image horizontally

    This example uses the IMG_FLIP_HORIZONTAL constant.

    <?php
    // File
    $filename = 'phplogo.png';

    // Content type
    header('Content-type: image/png');

    // Load
    $im = imagecreatefrompng($filename);

    // Flip it horizontally
    imageflip($im, IMG_FLIP_HORIZONTAL);

    // Output
    imagejpeg($im);
    imagedestroy($im);
    ?>

    Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    Output of example: Horizontally flipped image

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    User Contributed Notes 1 note

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    3
    Daniel Klein
    8 years ago
    If you're using PHP < 5.5 you can use this code to add the same functionality. If you pass the wrong $mode in it will silently fail. You might want to add your own error handling for this case.

    <?php
    if (!function_exists('imageflip')) {
          define('IMG_FLIP_HORIZONTAL', 0);
          define('IMG_FLIP_VERTICAL', 1);
          define('IMG_FLIP_BOTH', 2);

      function     imageflip($image, $mode) {
        switch (    $mode) {
          case     IMG_FLIP_HORIZONTAL: {
                $max_x = imagesx($image) - 1;
                $half_x = $max_x / 2;
                $sy = imagesy($image);
                $temp_image = imageistruecolor($image)? imagecreatetruecolor(1, $sy): imagecreate(1, $sy);
            for (    $x = 0; $x < $half_x; ++$x) {
                  imagecopy($temp_image, $image, 0, 0, $x, 0, 1, $sy);
                  imagecopy($image, $image, $x, 0, $max_x - $x, 0, 1, $sy);
                  imagecopy($image, $temp_image, $max_x - $x, 0, 0, 0, 1, $sy);
            }
            break;
          }
          case     IMG_FLIP_VERTICAL: {
                $sx = imagesx($image);
                $max_y = imagesy($image) - 1;
                $half_y = $max_y / 2;
                $temp_image = imageistruecolor($image)? imagecreatetruecolor($sx, 1): imagecreate($sx, 1);
            for (    $y = 0; $y < $half_y; ++$y) {
                  imagecopy($temp_image, $image, 0, 0, 0, $y, $sx, 1);
                  imagecopy($image, $image, 0, $y, 0, $max_y - $y, $sx, 1);
                  imagecopy($image, $temp_image, 0, $max_y - $y, 0, 0, $sx, 1);
            }
            break;
          }
          case     IMG_FLIP_BOTH: {
                $sx = imagesx($image);
                $sy = imagesy($image);
                $temp_image = imagerotate($image, 180, 0);
                imagecopy($image, $temp_image, 0, 0, 0, 0, $sx, $sy);
            break;
          }
          default: {
            return;
          }
        }
            imagedestroy($temp_image);
      }
    }
    ?>
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