imagescale

(PHP 5 >= 5.5.0, PHP 7)

imagescaleScale an image using the given new width and height

Beschreibung

resource imagescale ( resource $image , int $new_width [, int $new_height = -1 [, int $mode = IMG_BILINEAR_FIXED ]] )

imagescale() scales an image using the given interpolation algorithm.

Parameter-Liste

image

Eine von den verschiedenen Erzeugungsfunktionen wie imagecreatetruecolor() gelieferte Grafikressource.

new_width

The width to scale the image to.

new_height

The height to scale the image to. If omitted or negative, the aspect ratio will be preserved.

Achtung

You should always provide the height if using PHP 5.5.18 or earlier, or PHP 5.6.2 or earlier, as the aspect ratio calculation was incorrect.

mode

One of IMG_NEAREST_NEIGHBOUR, IMG_BILINEAR_FIXED, IMG_BICUBIC, IMG_BICUBIC_FIXED or anything else (will use two pass).

R├╝ckgabewerte

Return the scaled image resource on successIm Fehlerfall wird FALSE zur├╝ckgegeben..

Changelog

Version Beschreibung
5.5.19/5.6.3 The calculation of the height if new_height was negative or omitted was fixed; prior to these versions, the aspect ratio was not maintained correctly.

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User Contributed Notes 2 notes

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1
php at keith tyler dot com
21 days ago
"mode" argument doesn't work in PHP 5.5.9. Do imagesetinterpolation($im,IMG_MODE); first, then do imagescale($im,$x,$y) to apply it in scaling.
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-94
abc at ed48.com
2 years ago
<img src="image.jpg" alt="image" /><br><br>
<?php
$org_info
= getimagesize("image.jpg");
echo
$org_info[3] . '<br><br>';
$rsr_org = imagecreatefromjpeg("image.jpg");
$rsr_scl = imagescale($rsr_org, 860, 860IMG_BICUBIC_FIXED);
imagejpeg($rsr_scl, "imagebfb.jpg");
imagedestroy($rsr_org);
imagedestroy($rsr_scl);
?>
<img src="imagebfb.jpg" alt="imagebfb" /><br><br>
<?php
$scl_info
= getimagesize("imagebfb.jpg");
echo
$scl_info[3];
?>
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