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php-gdHow to resize an image and keep aspect ratio


<?php

$file = '/var/www/examples/heroine.png';
$size = getimagesize($file);
$im = imagecreatefrompng($file);

$w = 400;
$h = $w * $size[1] / $size[0];

$imf = imagecreatetruecolor($w, $h);
imagecopyresampled($imf, $im, 0,0,0,0, $w,$h,$size[0],$size[1]);

imagePng($imf, '/tmp/image.png');ctrl + c
/var/www/examples/heroine.png

path to image to resize

getimagesize

returns image size from given path

imagecreatefrompng

creates GD image object from given PNG image

$w = 400

resize image to 400 pixels wide

$w * $size[1] / $size[0]

calculates resized image height based on source image proportions

imagecreatetruecolor

creates true color GD image object with specified width & height

imagecopyresampled

resizes source image and writes result to destination image

imagePng

saves image in PNG format to the given path


How to resize an image and keep aspect ratio, php gd

Usage example

<?php

$file = '/var/www/examples/heroine.png';
$size = getimagesize($file);
$im = imagecreatefrompng($file);

$w = 400;
$h = $w * $size[1] / $size[0];

$imf = imagecreatetruecolor($w, $h);
imagecopyresampled($imf, $im, 0,0,0,0, $w,$h,$size[0],$size[1]);

imagePng($imf, '/tmp/image.png');