PHP 7.0.6 Released

imagescale

(PHP 5 >= 5.5.0, PHP 7)

imagescaleScale an image using the given new width and height

Descrição

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.

Parâmetros

image

Um resource de imagem, retornado por funções de criação de imagens, como 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.

Cuidado

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).

Valor Retornado

Return the scaled image resource on success ou FALSE em caso de falha.

Changelog

Versão Descrição
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
15 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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