https://gist.github.com/netconstructor/2395159
function image_resize_crop ( $src, $w, $h, $dest = null, $override = false, $createNewIfExists = false ) {
$ext = array_pop ( explode ('.', $src) );
$filenameSrc = str_replace (".$ext", '', basename($src) );
$filename = "{$filenameSrc}-{$w}X{$h}";
$arrayUploadPath = wp_upload_dir();
$fileUploadSubDir = str_replace(basename($src),'', str_replace($arrayUploadPath['baseurl'], '', $src));
$fileUploadDir = $arrayUploadPath['basedir'] . $fileUploadSubDir;
if(is_null($dest)) $dest = $fileUploadDir;
$i = null;
if( ! $override && $createNewIfExists ) {
$i = 0;
while ( file_exists("$dest$filename-$i.png") ) $i++;
$i = '-' . $i;
}
$fileFullPath = "$dest$filename$i.png";
$fileFullUrl = $arrayUploadPath['baseurl'] . $fileUploadSubDir . $filename.$i .'.png';
//return cached file if $override == false and file's already there
if( ! $override && file_exists($fileFullPath) ) return $fileFullUrl;
if( $override ) @unlink($fileFullPath);
switch ($ext) {
case 'jpg':
case 'jpeg' : $image = imagecreatefromjpeg($src); break;
case 'gif' : $image = imagecreatefromgif($src); break;
case 'png' : $image = imagecreatefrompng($src); break;
case 'wbmp' :
case 'bmp': $image = imagecreatefromwbmp($src); break;
default: $image = imagecreatefromgd2($src);
}
$width = imagesx($image);
$height = imagesy($image);
$original_aspect = $width / $height;
$thumb_aspect = $w / $h;
if ( $original_aspect >= $thumb_aspect ) {
if( $width > $w ) {
$new_height = $h;
$new_width = $width / ($height / $h);
}else{
$new_height = $height;
$new_width = $width;
}
} else {
if ( $width > $w ) {
$new_width = $w;
$new_height = $height / ($width / $w);
} else {
$new_width = $width;
$new_height = $height;
}
}
$thumb = imagecreatetruecolor($w, $h);
$bg = imagecolorallocate($thumb, 255, 255, 255);
imagefill($thumb, 0, 0, $bg);
imagecopyresampled($thumb,
$image,
0 - ($new_width - $w) / 2,
0 - ($new_height - $h) / 2,
0, 0,
$new_width, $new_height,
$width, $height);
imagepng($thumb, $fileFullPath, 9);
imagedestroy($image);
return $fileFullUrl;
}
