Php image scaling implementation _ PHP Tutorial

Php image scaling implementation method. Php basic exercise-image scaling: Copy the code as follows :? Php *** imagezoom. * functionimageZoom ($ filename, $ w, $ h) {* Argumentsmeaning ** $ filename: thesourceofth php basic exercise-image scaling:

The code is as follows:

/**
* Image zoom.
*/
Function imageZoom ($ filename, $ w, $ h ){
/* Arguments meaning */
/* $ Filename: the source of the name */
/* $ W: you want get the image's width */
/* $ H: you want get the imgage's height */
$ Arr = getimagesize ($ filename );
$ Src_w = $ arr [0];
$ Src_h = $ arr [1];
$ Src_t = $ arr [2];
/* 1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF (intel byte order ),
= TIFF (motorola byte order), 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC,
= IFF, 15 = WBMP, 16 = XBM */
$ Src_m = $ arr ['Mime '];

$ Src_img = imagecreatefromjpeg ($ filename );

If ($ w/$ src_w)> ($ h/$ src_h )){
$ Bili = $ h/$ src_h;
} Else {
$ Bili = $ w/$ src_h;
}
$ Dst_w = $ src_w * $ bili;
$ Dst_h = $ src_h * $ bili;
$ Dst_img = imagecreatetruecolor ($ dst_w, $ dst_h );

Imagecopyresampled ($ dst_img, $ src_img, 0, 0, 0, $ dst_w, $ dst_h, $ src_w, $ src_h );

Header ("content-type: {$ src_m }");

Switch ($ src_t ){
Case 1:
$ Imgout = "imagegif ";
Break;
Case 2:
$ Imgout = "imagejpeg ";
Break;
Case 3:
$ Imgout = "imagepng ";
Break;
Default:
Echo "The type was wrong! ";
Break;
}

$ Dst_filename = "s _". $ filename;
$ Imgout ($ dst_img, $ dst_filename );

Imagedestroy ($ dst_img );
}
$ Filename = 'gg.jpg ';
ImageZoom ($ filename, 100,200 );

Core: <1> pay attention to how the zoom ratio is obtained. although the image may be slightly different from the expected one, the zoom ratio is guaranteed at least.

<2> type control.

The pipeline code is as follows :? Php/*** image zoom. */function imageZoom ($ filename, $ w, $ h) {/* Arguments meaning * // * $ filename: the source of th...