craygo Posted April 8, 2008 Share Posted April 8, 2008 Here is a function that will resize an image to a specified maxsize. The maxsize is either width or height. It will calculate which one to use and then resizes but keeps the original aspect ratio so the images are not stretched. <?php /********************************** * Will resize an image to a * * max width or height and keep * * aspect ratio Name this file * * anything you like. * * I will use imageresize.php * **********************************/ header('Content-type: image/jpeg'); function resampleimage($maxsize, $sourcefile, $imgcomp=0){ // SET THE IMAGE COMPRESSION $g_imgcomp=100-$imgcomp; // CHECK TO SEE IF THE IMAGE EXISTS FIRST if(file_exists($sourcefile)){ // FIRST WE GET THE CURRENT IMAGE SIZE $g_is=getimagesize($sourcefile); /********* CALCULATE THE WIDTH AND THE HEIGHT ***************/ // CHECK TO SEE IF THE WIDTH AND HEIGHT ARE ALREADY SMALLER THAN THE MAX SIZE if($g_is[0] <= $maxsize && $g_is[1] <= $maxsize){ // LEAVE WIDTH AND HEIGHT ALONE IF IMAGE IS SMALLER THAN MAXSIZE $new_width=$g_is[0]; $new_height=$g_is[1]; } else { // GET VALUE TO CALCULATE WIDTH AND HEIGHT $w_adjust = ($maxsize / $g_is[0]); $h_adjust = ($maxsize / $g_is[1]); // CHECK TO WHICH DIMENSION REQUIRES THE SMALLER ADJUSTMENT if($w_adjust <= $h_adjust){ // CALCULATE WIDTH AND HEIGHT IF THE WIDTH VALUE IS SMALLER $new_width=($g_is[0]*$w_adjust); $new_height=($g_is[1]*$w_adjust); } else { // CALCULATE WIDTH AND HEIGHT IF THE HEIGHT VALUE IS SMALLER $new_width=($g_is[0]*$h_adjust); $new_height=($g_is[1]*$h_adjust); } } //SEARCHES IMAGE NAME STRING TO SELECT EXTENSION (EVERYTHING AFTER THE LAST "." ) $image_type = strrchr($sourcefile, "."); //SWITCHES THE IMAGE CREATE FUNCTION BASED ON FILE EXTENSION switch($image_type) { case '.jpg': $img_src = imagecreatefromjpeg($sourcefile); break; case '.jpeg': $img_src = imagecreatefromjpeg($sourcefile); break; case '.png': $img_src = imagecreatefrompng($sourcefile); break; case '.gif': $img_src = imagecreatefromgif($sourcefile); break; default: echo("Error Invalid Image Type"); die; break; } // CREATE THE TRUE COLOR IMAGE WITH NE WIDTH AND HEIGHT $img_dst=imagecreatetruecolor($new_width,$new_height); // RESAMPLE THE IMAGE TO NEW WIDTH AND HEIGHT imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $new_width, $new_height, $g_is[0], $g_is[1]); // OUTPUT THE IMAGE AS A JPEG. // THIS CAN BE CHANGED IF YOU WANT TRANSPARENCY OR PREFER ANOTHER FORMAT. MAKE SURE YOU CHANGE HEADER ABOVE. imagejpeg($img_dst); // DESTROY THE NEW IMAGE imagedestroy($img_dst); return true; } else { return false; } } // NOW CALL THE IMAGE FROM ANY OTHER PAGE WITH <img src="imageresize.php?maxsize=xxx&source=path/to/image/file" border=0 /> xxx=a value for the max size resampleimage($_GET['maxsize'], $_GET['source']); ?> Now you can do this for a folder loop <?php $files = glob('images/*.jpg'); foreach($files as $f){ echo "<img src=\"imageresize.php?maxsize=200&source=".$f."\" />\n"; } ?> Or in a while loop from a database <?php // if path to pictures is not included with filename add here $image_path = 'images/'; // do sql statement and run query below // start while loop while($row = mysql_fetch_assoc($result)){ echo "<img src=\"imageresize.php?maxsize=200&source=".$image_path.$row['image']."\" />\n"; } ?> Hope it is useful Ray Link to comment Share on other sites More sharing options...
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