How to change image size in php

How to change the image size in php: 1. Use the function [$xmax] to modify the maximum width of the image; 2. Use the function [$ymax] to modify the maximum height of the image; use the function [$tmpname] to upload the file to Table of contents.

php method to change the image size:

Use the following code to modify the image size or create a thumbnail.

Parameter description:

• $filename: file name.

• $tmpname: File path, such as the temporary directory during upload.

• $xmax: Maximum width after modification.

• $ymax: Maximum height after modification.

= $y) { $newx = $xmax; $newy = $newx * $y / $x; } else { $newy = $ymax; $newx = $x / $y * $newy; } $im2 = imagecreatetruecolor($newx, $newy); imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y); return $im2; } ?>

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