How to resize an image by some pixel say 200px in PHP

To resize an image by 200px in PHP, you can use the GD library which is a popular PHP extension for manipulating images.

Here's an example code that resizes an image by 200px:

// Load the image from a file $filename = 'path/to/image.jpg'; $image = imagecreatefromjpeg($filename); // Get the current dimensions of the image $width = imagesx($image); $height = imagesy($image); // Calculate the new dimensions of the image $newWidth = $width + 200; $newHeight = $height + 200; // Create a new image with the new dimensions $newImage = imagecreatetruecolor($newWidth, $newHeight); // Copy and resize the original image to the new image imagecopyresized($newImage, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height); // Save the new image to a file $newFilename = 'path/to/new_image.jpg'; imagejpeg($newImage, $newFilename); // Free up memory imagedestroy($image); imagedestroy($newImage);

This code loads an image from a file using imagecreatefromjpeg(), calculates the new dimensions of the image by adding 200 pixels to the width and height, creates a new image with the new dimensions using imagecreatetruecolor(), copies and resizes the original image to the new image using imagecopyresized(), saves the new image to a file using imagejpeg(), and frees up memory using imagedestroy().

Note that you can replace imagecreatefromjpeg() with imagecreatefrompng() or imagecreatefromgif() if you're working with a PNG or GIF image respectively.

Resize image to max 200px by width and height

To resize an image to a maximum of 200px by width and height in PHP, you can use the GD library which is a popular PHP extension for manipulating images.

Here's an example code that resizes an image to a maximum of 200px by width and height:

// Load the image from a file $filename = 'path/to/image.jpg'; $image = imagecreatefromjpeg($filename); // Get the current dimensions of the image $width = imagesx($image); $height = imagesy($image); // Calculate the new dimensions of the image $maxWidth = 200; $maxHeight = 200; if ($width > $maxWidth || $height > $maxHeight) { $scale = min($maxWidth / $width, $maxHeight / $height); $newWidth = round($width * $scale); $newHeight = round($height * $scale); } else { $newWidth = $width; $newHeight = $height; } // Create a new image with the new dimensions $newImage = imagecreatetruecolor($newWidth, $newHeight); // Copy and resize the original image to the new image imagecopyresampled($newImage, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height); // Save the new image to a file $newFilename = 'path/to/new_image.jpg'; imagejpeg($newImage, $newFilename); // Free up memory imagedestroy($image); imagedestroy($newImage);

This code loads an image from a file using imagecreatefromjpeg(), calculates the new dimensions of the image by scaling the width and height down if either of them are larger than 200 pixels, creates a new image with the new dimensions using imagecreatetruecolor(), copies and resizes the original image to the new image using imagecopyresampled(), saves the new image to a file using imagejpeg(), and frees up memory using imagedestroy().

Note that you can replace imagecreatefromjpeg() with imagecreatefrompng() or imagecreatefromgif() if you're working with a PNG or GIF image respectively. Also note that imagecopyresampled() is used instead of imagecopyresized() to improve the quality of the resized image.