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 + cgithub

`/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');

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php-gdHow to resize an image and keep aspect ratio

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