How to modify the size of uploaded images in php

How to modify the size of the uploaded image in php: first open the script file; then use the getimagesize function to obtain the image size; finally modify the image size through functions such as imagecreatetruecolor.

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How to modify the image size in PHP

Mainly implemented through imagecreatetruecolor.

$filename = "./QR/$id.jpg";
$percent = 0.4;
list($width, $height) = getimagesize($filename);
$new_width = $width * $percent;
$new_height = $height * $percent;
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagejpeg($image_p,'./images/thumb/'.$id.'.jpg');

filename is the file name;

percent is the reduction ratio;

imagejpeg is the output saved image.

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