imagecreatefromjpeg

imagecreatefromjpeg is a PHP function in the GD graphics library that creates an image resource from a JPEG file. It loads a JPEG image into memory so PHP can manipulate it with the GD functions.

Syntax: resource imagecreatefromjpeg(string $filename)

Parameters: filename is the path to the JPEG file to load. The function may also load a JPEG from a URL if allow_url_fopen is enabled and the URL is accessible. The file must be a valid JPEG image.

Return value: On success, it returns an image resource that can be used with other GD functions such as imagesx, imagesy, imagecopyresampled, and imagejpeg. If loading fails, it returns false and may emit a warning.

Requirements and notes: The GD extension with JPEG support must be installed and enabled. The script must have read access to the file. Large images can consume substantial memory, so consider memory limits and potential resizing after loading. imagecreatefromjpeg does not automatically correct EXIF orientation; additional handling may be required if the source image has orientation data.

Usage example: $img = imagecreatefromjpeg('uploads/photo.jpg'); if ($img === false) { die('Invalid JPEG'); } $width = imagesx($img); $height = imagesy($img); // perform processing ... imagedestroy($img);

See also: imagejpeg, imagecreatefrompng, imagecreatefromstring, imagedestroy.