php-gdHow to create thumbnail

<?php

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

$w = 50;
$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	`50` width of resulting thumbnail
`$w * $size[1] / $size[0]` calculate thumbnail height to keep aspect ratio	`imagecopyresampled` resizes source image and writes result to destination image
`imagePng` saves image in PNG format to the given path

Usage example

<?php

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

$w = 50;
$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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