'The Quickest to Understand PHP Programming' Lecture 7: PHP Image Verification Code and Thumbnail_PHP Tutorial

Example 22 Core code of image verification

Copy code The code is as follows:

//header( "content-type:image/png");
$num ='1234';
$imagewidth=60;
$imageheight=18;

$numimage = imagecreate($imagewidth ,$imageheight);
imagecolorallocate($numimage,240,240,240);
for($i=0;$i$x = mt_rand(1,8 )+$imagewidth*$i/4;
$y = mt_rand(1,$imageheight/4);
$color=imagecolorallocate($numimage,mt_rand(0,150),mt_rand(0,150),mt_rand(0,150 ));
imagestring($numimage,5,$x,$y,$num[$i],$color);
}

for($i=0;$i< 200;$i++){
$randcolor=imagecolorallocate($numimage,rand(200,255),rand(200,255),rand(200,255));
imagesetpixel($numimage,rand()%70,rand() %20,$randcolor);
}
imagepng($numimage);
imagedestroy($numimage);
?>

This is to output 4 verifications As an example of coding, for Chinese characters, a font file and imagettftext function are required. When using them, please search online. If you want to generate random numbers, there is the mt_rand function; you also need to use session to save the random numbers; if you need to convert them to utf-8, you need the iconv function.

Example 23 Thumbnail

Copy code The code is as follows:

class SimpleImage {
var $image;
var $image_type;
function load($filename) {
$image_info = getimagesize($filename);
$this->image_type = $image_info [2];
if( $this->image_type == IMAGETYPE_JPEG ) {
$this->image = imagecreatefromjpeg($filename);
} elseif( $this->image_type == IMAGETYPE_GIF ) {
$this->image = imagecreatefromgif($filename);
} elseif( $this->image_type == IMAGETYPE_PNG ) {
$this->image = imagecreatefrompng($filename );
}
}
function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
if( $image_type == IMAGETYPE_JPEG ) {
imagejpeg($this->image,$filename,$compression);
} elseif( $image_type == IMAGETYPE_GIF ) {
imagegif($this->image,$filename);
} elseif ( $image_type == IMAGETYPE_PNG ) {
imagepng($this->image,$filename);
}
if( $permissions != null) {
chmod($filename,$permissions );
}
}
function output($image_type=IMAGETYPE_JPEG) {
if( $image_type == IMAGETYPE_JPEG ) {
imagejpeg($this->image);
} elseif( $image_type == IMAGETYPE_GIF ) {
imagegif($this->image);
} elseif( $image_type == IMAGETYPE_PNG ) {
imagepng($this->image);
}
}
function getWidth() {
return imagesx($this->image);
}
function getHeight() {
return imagesy($this- >image);
}
function resizeToHeight($height) {
$ratio = $height / $this->getHeight();
$width = $this->getWidth( ) * $ratio;
$this->resize($width,$height);
}
function resizeToWidth($width) {
$ratio = $width / $this-> getWidth();
$height = $this->getheight() * $ratio;
$this->resize($width,$height);
}
function scale($ scale) {
$width = $this->getWidth() * $scale/100;
$height = $this->getheight() * $scale/100;
$this-> ;resize($width,$height);
}
function resize($width,$height) {
$new_image = imagecreatetruecolor($width, $height);
imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
$this->image = $new_image;
}
}

$newfile = UPLOAD_DIR."/icons/".md5($_SESSION['USER']->email).".jpg";// Directory where uploaded files are saved
$image = new SimpleImage();
$image->load($_FILES['icons']['tmp_name']);//Uploaded temporary file name
$image->resizeToWidth(80);Set width
$image->save($newfile);
?>

http://www.bkjia.com/PHPjc/322671.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/322671.htmlTechArticleExample 22 The core code of image verification is copied as follows: ?php //header("content-type:image /png"); $num ='1234'; $imagewidth=60; $imageheight=18; $numimage = imagecreate($imag...