imagerotate
(PHP 4 >= 4.3.0, PHP 5, PHP 7)
imagerotate — Rotate an image with a given angle
Beschreibung
$image
, float $angle
, int $bgd_color
[, int $ignore_transparent = 0
] ) : resource
Rotates the image image using the given
angle in degrees.
The center of rotation is the center of the image, and the rotated image may have different dimensions than the original image.
Parameter-Liste
-
image -
Eine von den verschiedenen Erzeugungsfunktionen wie imagecreatetruecolor() gelieferte Grafikressource.
-
angle -
Rotation angle, in degrees. The rotation angle is interpreted as the number of degrees to rotate the image anticlockwise.
-
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).
Rückgabewerte
Returns an image resource for the rotated image, Im Fehlerfall wird FALSE zurückgegeben..
Changelog
| Version | Beschreibung |
|---|---|
| 5.5.0 |
The ignore_transparent is now silently ignored.
|
| 5.5.0 | This function is now affected by the interpolation method set by the imagesetinterpolation() function. |
| 5.1.0 |
ignore_transparent was added.
|
Beispiele
Beispiel #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);
// Free the memory
imagedestroy($source);
imagedestroy($rotate);
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Anmerkungen
Hinweis:
Diese Funktion wird von der mittels imagesetinterpolation() eingestellten Interpolationsmethode beeinflusst.