Crops an image square.

gistfile1.php

<?php

function _process_image($data){

	if($data['is_image'] == TRUE){

		// It's definitely an image...

		// Work out essential dimensions

		$ori = ($data['image_height'] > $data['image_width']) ? 'portrait' : 'landscape';        
		$ratio = ($ori == 'portrait') 
			? $data['image_height'] / $data['image_width'] 
			: $data['image_width'] / $data['image_height'];

		$thumb_size = 162;
		//$max_height = 344;
		//$max_width = 516;

		$this->load->library('image_lib');

		// Step 1 - Shrink it to thumb size (one dimension)
		$config['source_image'] = $data['full_path'];
		$config['new_image'] = "./web/media/thumbnails/" . $data['file_name'];
		// Save filename for later cropping
		$sq = $config['new_image'];
		$config['maintain_ratio'] = TRUE;
		$config['quality'] = 90;
		if($ori == 'landscape'){
			$config['height'] = $thumb_size;
			$config['width'] = $thumb_size * $ratio;
		}
		if($ori == 'portrait'){
			$config['width'] = $thumb_size;
			$config['height'] = $thumb_size * $ratio;
		}

		$this->image_lib->initialize($config);
		if(!$this->image_lib->resize()){
			$resize_errors[] = 'Resize: ' . $this->image_lib->display_errors('', '');
		}

		$this->image_lib->clear();
		unset($config);


		// Step 2 - Crop the shrunken image so it's square
		if($ori == 'portrait'){
			$height = ($thumb_size * $ratio);    
			$config['x_axis'] = 0;
			$config['y_axis'] = ($height - $thumb_size) / 2;
		} else {
			$width = ($thumb_size * $ratio);    
			$config['y_axis'] = 0;
			$config['x_axis'] = ($width - $thumb_size) / 2;
		} 

		$config['height'] = $thumb_size;
		$config['width'] = $thumb_size;
		$config['source_image'] = $sq;
		$config['maintain_ratio'] = FALSE;

		$this->image_lib->initialize($config);

		if(!$this->image_lib->crop()){
			$resize_errors[] = 'Crop: ' . $this->image_lib->display_errors('', '');
		}

		if(isset($resize_errors) && count($resize_errors) > 0){
			// Errors - we failed.
			$this->_resize_errors = $resize_errors;
			return FALSE;
		} else {
			// All OK.
			return TRUE;
		}

	} else {

		// Not an image. How can that be?? Good job we checked.
		return FALSE;

	}

}