imagescale

(PHP 5 >= 5.5.0)

imagescaleScale an image using the given new width and height

Descrierea

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.

Parametri

image

O resursă - imagine, întoarsă de una din funcțiile de creare a imaginilor, cum ar fi imagecreatetruecolor().

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.

Precauţie

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).

Valorile întoarse

Return the scaled image resource on success sau FALSE în cazul eșecului.

Istoricul schimbărilor

Versiune Descriere
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
Anonymous
2 months ago
imageScale has got troubles with scaling images...
It can output Segmentation Fault when you want to provide custom $mode argument.
How to scale image with interpolation in php gd?
Use imagecopyresampled() instead of imagescale().
up
-37
abc at ed48.com
1 year 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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