imagerotate

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

imagerotateRotate an image with a given angle

Beschreibung

imagerotate ( resource $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$degrees0);

// Output
imagejpeg($rotate);

// Free the memory
imagedestroy($source);
imagedestroy($rotate);
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

Output of example : Rotate an image 180 degrees

Anmerkungen

Hinweis:

Diese Funktion wird von der mittels imagesetinterpolation() eingestellten Interpolationsmethode beeinflusst.

Siehe auch

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