Php watermarking and thumbnails implementation code (1/2)

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<? Php Tutorial /************************************ // Function: watermark ($ bigimg, $ smallimg, $ coord = 1) // Function: add a watermark // Parameters: $ Bigimg is required. Large Image-watermark image $ Smallimg is required. Small image $ Coord is optional. Position of the watermark in a large image, 1 upper left corner; 2 upper right corner; 3 lower right corner; 4 lower left corner; 5 Middle Corner // Example: watermark('datu.png ', 'xiaotu.png', 3); // add a watermark to datu.png. The watermark position is in the lower right corner. *************************************/ Function watermark ($ bigimg, $ smallimg, $ coord = 1 ){ // Load two images and convert them to the encoding format recognized by php, // It is equivalent to the imagecreate function, except that an empty image is created here. $ Bi = getimagesize ($ bigimg ); Switch ($ bi [2]) { Case 1: $ Im1 = imagecreatefromgif ($ bigimg); break; Case 2; $ Im1 = imagecreatefromjpeg ($ bigimg); break; Case 3; $ Im1 = imagecreatefrompng ($ bigimg); break; } $ Si = getimagesize ($ smallimg ); Switch ($ si [2]) { Case 1: $ Im2 = imagecreatefromgif ($ smallimg); break; Case 2; $ Im2 = imagecreatefromjpeg ($ smallimg); break; Case 3; $ Im2 = imagecreatefrompng ($ smallimg); break; } // Create a watermark-principle: copy a small image to a large image. Pay attention to the calculation of coordinate values. Switch ($ coord ){ Case 1: Imagecopy ($ im1, $ im2, 0, 0, 0, 0, $ si [0], $ si [1]); break; Case 2: Imagecopy ($ im1, $ im2, $ bi [0]-$ si [0], 0, 0, 0, $ si [0], $ si [1]); break; Case 3: Imagecopy ($ im1, $ im2, $ bi [0]-$ si [0], $ bi [1]-$ si [1], 0, 0, $ si [0], $ si [1]); break; Case 4: Imagecopy ($ im1, $ im2, 0, $ bi [1]-$ si [1], 0, 0, $ si [0], $ si [1]); break; Case 5: Imagecopy ($ im1, $ im2, ($ bi [0]-$ si [0])/2, ($ bi [1]-$ si [1])/2, 0, 0, $ si [0], $ si [1]); break; } // Generate image files of different formats based on the suffix Switch ($ bi [2]) { Case 1: Imagegif ($ im1); break; Case 2; Imagejpeg ($ im1); break; Case 3; Imagepng ($ im1); break; } Imagedestroy ($ im1 ); } /*************************************** ********* // Function: thumbnail ($ srcimg, $ multiple) // Function: generate a thumbnail // Parameters: // $ Srcimg is required. SOURCE image file name // $ Multiple is optional. The scaling factor. The default value is 2 times, which is reduced to 1/2 of the original one. // Note: only images in gif, jpg, and png formats are supported. // Example: thumbnail('my Image .jpg ', 5 ); **************************************** *********/ Function thumbnail ($ srcimg, $ multiple = 2 ){ // Load the image and save its information to the array $ Srcimg_arr = getimagesize ($ srcimg ); // Calculate the scaling factor $ Thumb_width = $ srcimg_arr [0]/$ multiple; $ Thumb_height = $ srcimg_arr [1]/$ multiple; // Determine the format of the image to be created (converted to php-recognized encoding) Switch ($ srcimg_arr [2]) { Case 1: $ Im = imagecreatefromgif ($ srcimg); break; Case 2; $ Im = imagecreatefromjpeg ($ srcimg); break; Case 3; $ Im = imagecreatefrompng ($ srcimg); break; }

 

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