PHP Chinese character verification code generation program_PHP tutorial

This article provides a PHP tutorial Chinese character verification code generation program. If you generate Chinese characters in pictures, you need font files and imagettftext functions. 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.

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";//The 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);
?>