Mini PHP Framework Library/image.class.php

<?php

Verification Code Class

Class Image {

protected $im;

protected $img _width;

protected $img _height;

protected $img _type;

Generate random numbers

static public Function randstr ($n = 4) {

if ($n <= 0) {

Return ';

}

$str = ' abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ0123456789 ';

$str = substr (Str_shuffle ($STR), 0, $n);

return $str;

}

Generate Verification Code

static public Function Chkcode ($w =60, $h =25) {

$w wide, $h high

$code = Self::randstr (4);

Create a canvas

$im = Imagecreatetruecolor ($w, $h);

$bak = Imagecreatetruecolor ($w, $h);

Color, Gray + blue Word

$gray = Imagecolorallocate ($im, 100,100,100);

$blue = Imagecolorallocate ($im, 0,0,255);

$bak _gray = imagecolorallocate ($bak, 100,100,100);

Fill

Imagefill ($im, 0,0, $gray);

Imagefill ($bak, 0,0, $bak _gray);

Write

Imagestring ($im, 5,10,5, $code, $blue);

/*****

Store the verification code in the session

*****/

/*****

The character of the verification code is distorted, for reference, not required.

$niu = 3;

for ($i =0; $i <60; $i + +) {

Calculate y-axis fluctuation by sine function

$y = sin (Deg2rad (720/$w) * $i) * $NIU;

Imagecopy ($bak, $im, $i, $y, $i, 0,1, $h);

}

*****/

Header (' Content-type:image/jpeg ');

Imagejpeg ($bak);

}

static public Function Make_thumb ($ori, $w =200, $h =200) {

Judging the original size, if the original image is smaller than the thumbnail, do not have to deal with.

Read a big picture as a canvas

$info = Self::getinfo ($ori);

if ($info [' func '] = = = = False) {

return false;

}

$createfunc = ' Imagecreatefrom '. $info [' func ']; Analyze the name of the function used to read the large image.

$SRC = $createfunc ($ori);

Create a small canvas and make the background gray

$small = Imagecreatetruecolor ($w, $h);

$gray = Imagecolorallocate ($small, 100,100,100);

Imagefill ($small, 0,0, $gray);

Copy large image to small image

$scale = min ($w/$info [' width '], $h/$info [' height ']); In order to fit the smaller reduction ratio

Calculates the size of the last block, depending on the proportions.

$REALW = $info [' width '] * $scale;

$realh = $info [' height '] * $scale;

Generate a small image

/*

BOOL Imagecopyresampled (Resource $DST _image, resource $src _image, int $dst _x, int $dst _y, int $src _x, int $src _y, int $DST _w, int $dst _h, int $src _w, int $src _h)

*/

Calculate left White

$LW = Round (($w-$REALW)/2); To calculate the left side width

$LH = Round (($h-$REALH)/2); Calculate the height left above

Imagecopyresampled ($small, $SRC, $LW, $LH, 0,0, $REALW, $realh, $info [' width '], $info [' height '];

/*

Header (' Content-type:image/jpeg ');

Imagejpeg ($small);

*/

Calculate the storage path for small images

$thumburl = Str_replace ('. ', ' _thumb ', $ori);

$imagefunc = ' image '. $info [' func '];

if ($imagefunc ($small, $thumburl)) {

Return Str_replace (ROOT, ", $thumburl);

} else {

return false;

}

}

static public Function GetInfo ($ori) {

$arr = getimagesize ($ori);

If the original image is not parsed, direct false

if ($arr = = = False) {

return false;

}

$info = Array ();

$info [' width '] = $arr [0];

$info [' height '] = $arr [1];

Switch ($arr [2]) {

Case 1:

$info [' func '] = ' gif ';

Break

Case 2:

$info [' func '] = ' jpeg ';

Break

Case 3:

$info [' func '] = ' png ';

Break

Case 6:

$info [' func '] = ' wbmp ';

Break

Default

$info [' func '] = false;

}

return $info;

}

}

Image::chkcode ();

?>