How to server-side resize images in PHP5 without external libraries?

Question

Background: For an university project I have to use PHP5 to create a web application that also deals with images. I'm not allowed to use any external APIs, frameworks or AJAX.

Is there a native function to resize images in PHP5?

(I know a can specify both width and height for an img tag, but that resizing is done on the client. I'd rather save downsized images on the server.)

You can use GD if it's enabled in your PHP configuration. http://stackoverflow.com/questions/7393319/resize-images-with-php — MetalFrog, Jan 23 '12 at 15:24
PHP has no native image manipulation functions. For that you need GD or Imagick, which are external libraries but generally available in most standard PHP installs. — Marc B, Jan 23 '12 at 15:44

score 4 · Accepted Answer · answered Jan 23 '12 at 15:24

4

The GD library has been bundled with PHP since 4.3, and will do what you want: http://uk.php.net/manual/en/book.image.php. You'll probably want something like imagecopyresampled.

answered Jan 23 '12 at 15:24

Adam Wright

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score 2 · Answer 2 · answered Jan 23 '12 at 15:24

2

Most PHP installations come bundled with the GD library. In fact, I've yet to come across a PHP installation that doesn't have GD bundled.

answered Jan 23 '12 at 15:24

Martin Bean

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I have had to uncomment it once or twice in the php.ini, so that may be necessary. – Tim Withers Jan 23 '12 at 15:25

How to server-side resize images in PHP5 without external libraries?

2 Answers2