imagerotate
(PHP 4 >= 4.3.0, PHP 5)
imagerotate — Rotate an image with a given angle
說明
resource imagerotate
( resource $source_image
, float $angle
, int $bgd_color
[, int $ignore_transparent
] )
Rotates the source_image image using the given angle in degrees.
The center of rotation is the center of the image, and the rotated image is scaled down so that the whole rotated image fits in the destination image - the edges are not clipped.
參數
- source_image
-
The source image link
- angle
-
Rotation angle, in degrees.
- bgd_color
-
Specifies the color of the uncovered zone after the rotation
- ignore_transparent
-
If set and non-zero, transparent colors are ignored (otherwise kept).
Return值
更新日誌
| 版本 | 說明 |
|---|---|
| 5.1.0 | ignore_transparent was added. |
範例
Example#1 Rotate an image 180 degrees
This example rotates an image 180 degrees - upside down.
<?php
// File and rotation
$filename = 'test.jpg';
$degrees = 180;
// Content type
header('Content-type: image/jpeg');
// Load
$source = imagecreatefromjpeg($filename);
// Rotate
$rotate = imagerotate($source, $degrees, 0);
// Output
imagejpeg($rotate);
?>
上例的輸出類似於：
註釋
Note: 本函式僅在 PHP 與其包含的 GD 函式庫一起編譯時可用。