PHP 7.0.6 Released

imageflip

(PHP 5 >= 5.5.0, PHP 7)

imageflipFlips an image using a given mode

Descrição

bool imageflip ( resource $image , int $mode )

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.

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($imIMG_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($imIMG_FLIP_HORIZONTAL);

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

O exemplo acima irá imprimir algo similar à:

Output of example: Horizontally flipped image

Notas

Nota: Esta função somente está disponível se o PHP estiver compilado com a versão embarcada da biblioteca GD.

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User Contributed Notes 1 note

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Daniel Klein
2 months 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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