PHP裁剪图片

发表于 2016-1-14 / 1605 次围观

/**

* 裁切图片 高度冲裁

* @param unknown $src_file 源文件

* @param unknown $dst_file 新文件名

* @param number $height 裁切掉的高度

*/

function my_image_resize($src_file, $dst_file, $height = 30) {

if (! file_exists ( $src_file )) {

echo $src_file . " is not exists !";

exit ();

}

$type = exif_imagetype ( $src_file );

$support_type = array (

IMAGETYPE_JPEG,

IMAGETYPE_PNG,

IMAGETYPE_GIF

);

if (! in_array ( $type, $support_type, true )) {

echo "this type of image does not support! only support jpg , gif or png";

exit ();

}

switch ($type) {

case IMAGETYPE_JPEG :

$src_img = imagecreatefromjpeg ( $src_file );

break;

case IMAGETYPE_PNG :

$src_img = imagecreatefrompng ( $src_file );

break;

case IMAGETYPE_GIF :

$src_img = imagecreatefromgif ( $src_file );

break;

default :

echo "Load image error!";

exit ();

}

$w = imagesx ( $src_img );

$h = imagesy ( $src_img );

$ratio_w = $w;

$ratio_h = $h - $height;

$inter_img = imagecreatetruecolor ( $w, $h );

imagecopyresampled ( $inter_img, $src_img, 0, 0, 0, 0, $w, $h, $w, $h );

$new_img = imagecreatetruecolor ( $ratio_w, $ratio_h );

imagecopy ( $new_img, $inter_img, 0, 0, 0, 0, $ratio_w, $ratio_h );

switch ($type) {

case IMAGETYPE_JPEG :

imagejpeg ( $new_img, $dst_file, 100 );

break;

case IMAGETYPE_PNG :

imagepng ( $new_img, $dst_file, 100 );

break;

case IMAGETYPE_GIF :

imagegif ( $new_img, $dst_file, 100 );

break;

default :

break;

}

}

标签: PHP

技术宅，科技怪，程序猿。

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