PHP image processing: Add watermark, thumbnail implementation (Custom function: watermark, thumbnail)

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Copy CodeThe code is as follows:
<?php
/************************************
Functions: Watermark ($bigimg, $smallimg, $coord = 1)
Role: Add watermarks
Parameters:
$bigimg must be selected. Big picture--a picture to add a watermark
$smallimg must be selected. Small picture
$coord Optional. The position of the watermark in the larger image,
1 upper left corner 2 upper right corner 3 lower right corner 4 lower left corner 5 middle
Example: Watermark (' datu.png ', ' Xiaotu.png ', 3); Watermark to Datu.png, watermark position in lower right corner
*************************************/
function watermark ($bigimg, $smallimg, $coord = 1) {
Load two pictures and turn it into a coded format that PHP recognizes,
is equivalent to the Imagecreate function, except that it is not an empty picture created here.
$bi = getimagesize ($bigimg);
Switch ($bi [2]) {
Case 1:
$im 1 = imagecreatefromgif ($bigimg);
Case 2;
$im 1 = imagecreatefromjpeg ($bigimg);
Case 3;
$im 1 = imagecreatefrompng ($bigimg);
}
$si = getimagesize ($smallimg);
Switch ($si [2]) {
Case 1:
$im 2 = imagecreatefromgif ($smallimg);
Case 2;
$im 2 = imagecreatefromjpeg ($smallimg);
Case 3;
$im 2 = imagecreatefrompng ($smallimg);
}
Create a watermark--principle: Copy small images to larger images. Here, pay attention to the calculation of coordinate values
Switch ($coord) {
Case 1:
Imagecopy ($im 1, $im 2, 0, 0, 0, 0, $si [0], $si [1]); Break
Case 2:
Imagecopy ($im 1, $im 2, $bi [0]-$si [0], 0, 0, 0, $si [0], $si [1]); Break
Case 3:
Imagecopy ($im 1, $im 2, $bi [0]-$si [0], $bi [1]-$si [1], 0, 0, $si [0], $si [1]); Break
Case 4:
Imagecopy ($im 1, $im 2, 0, $bi [1]-$si [1], 0, 0, $si [0], $si [1]); Break
Case 5:
Imagecopy ($im 1, $im 2, ($bi [0]-$si [0])/2, ($bi [1]-$si [1])/2, 0, 0, $si [0], $si [1]); Break
}
Generate a picture file of different formats according to the suffix name
Switch ($bi [2]) {
Case 1:
Imagegif ($im 1);
Case 2;
Imagejpeg ($im 1);
Case 3;
Imagepng ($im 1);
}
Imagedestroy ($im 1);
}
/************************************************
Functions: Thumbnail ($srcimg, $multiple)
Function: Generate a thumbnail image
Parameters:
$srcimg must be selected. Source Picture file name
$multiple Optional. Thumbnail multiples, default to twice times, that is, reduced to the original 1/2
Note: Only gif, JPG, PNG-formatted pictures are supported.
Example: Thumbnail (' my picture. jpg ', 5);
*************************************************/
function thumbnail ($srcimg, $multiple = 2) {
Load a picture and save its information to an array
$srcimg _arr = getimagesize ($srcimg);
Calculate the thumbnail multiple
$thumb _width = $srcimg _arr[0]/$multiple;
$thumb _height = $srcimg _arr[1]/$multiple;
Judge: What format image to build (convert to PHP-recognized encoding)
Switch ($srcimg _arr[2]) {
Case 1:
$im = Imagecreatefromgif ($srcimg);
Case 2;
$im = Imagecreatefromjpeg ($srcimg);
Case 3;
$im = Imagecreatefrompng ($srcimg);
}
Start the thumbnail operation
$thumb = Imagecreatetruecolor ($thumb _width, $thumb _height);
Imagecopyresized ($thumb, $im, 0, 0, 0, 0, $thumb _width, $thumb _height, $srcimg _arr[0], $srcimg _arr[1]);
Switch ($srcimg _arr[2]) {
Case 1:
Imagegif ($THUMB); Break
Case 2;
Imagejpeg ($THUMB); Break
Case 3;
Imagepng ($THUMB); Break
}
Imagepng ($THUMB);
Imagedestroy ($THUMB);
}
Do not use both of these functions while testing.
Watermark (' datu.png ', ' xiaotu.png ', 5);
Thumbnail (' Abc.png ', 3);
?>