(PHP 5 >= 5.5.0, PHP 7, PHP 8)
imageflip — Flips an image using a given mode
image由图象创建函数(例如imagecreatetruecolor())返回的 GdImage 对象。
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. | 
   成功时返回 true, 或者在失败时返回 false。
  
| 版本 | 说明 | 
|---|---|
| 8.0.0 | imageexpects a GdImage
  instance now; previously, a resource was expected. | 
示例 #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);
?>
以上例程的输出类似于:
 
     
示例 #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);
?>
以上例程的输出类似于:
