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    imageflip

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

    imageflip — Flips an image using a given mode

    Descrição

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

    Flips the image image using the given mode.

    Parâmetros

    image

    Um resource de imagem, retornado por funções de criação de imagens, como imagecreatetruecolor().

    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.

    Valor Retornado

    Retorna true em caso de sucesso ou false em caso de falha.

    Changelog

    Versão Descrição
    8.0.0 image expects a GdImage instance now; previously, a resource was expected.

    Exemplos

    Exemplo #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);
    ?>

    O exemplo acima irá imprimir algo similar à:

    Output of example: Vertically flipped image

    Exemplo #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);
    ?>

    O exemplo acima irá imprimir algo similar à:

    Output of example: Horizontally flipped image

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    User Contributed Notes 1 note

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    4
    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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