Home Backend Development PHP Tutorial PHP uses GIFEncoder class to generate GIF dynamic picture verification code_PHP tutorial

PHP uses GIFEncoder class to generate GIF dynamic picture verification code_PHP tutorial

Jul 13, 2016 am 10:26 AM
gif php Dynamic picture verification code

I believe many people have thought about how to use PHP to generate GIF animation to implement dynamic image verification codes. The following is the implementation process.
The PHP source code of the GIF animation implemented by the ImageCode function through the GIFEncoder class. Interested friends can study it.

The effect is as shown below:

Copy code The code is as follows:

/**

* ImageCode generates GIF image verification

* @param $string string

* @param $width width

* @param $height height

**/

function ImageCode($string = '', $width = 75, $height = 25)

{

$authstr = $string ? $string : ((time() % 2 == 0) ? mt_rand(1000, 9999) : mt_rand(10000, 99999));

$board_width = $width;

$board_height = $height;

// Generate a 32-frame GIF animation

for($i = 0; $i < 32; $i++)

{

ob_start();

$image = imagecreate($board_width, $board_height);

imagecolorallocate($image, 0,0,0);

//Set text color array

$colorList[] = ImageColorAllocate($image, 15,73,210);

$colorList[] = ImageColorAllocate($image, 0,64,0);

$colorList[] = ImageColorAllocate($image, 0,0,64);

$colorList[] = ImageColorAllocate($image, 0,128,128);

$colorList[] = ImageColorAllocate($image, 27,52,47);

$colorList[] = ImageColorAllocate($image, 51,0,102);

$colorList[] = ImageColorAllocate($image, 0,0,145);

$colorList[] = ImageColorAllocate($image, 0,0,113);

$colorList[] = ImageColorAllocate($image, 0,51,51);

$colorList[] = ImageColorAllocate($image, 158,180,35);

$colorList[] = ImageColorAllocate($image, 59,59,59);

$colorList[] = ImageColorAllocate($image, 0,0,0);

$colorList[] = ImageColorAllocate($image, 1,128,180);

$colorList[] = ImageColorAllocate($image, 0,153,51);

$colorList[] = ImageColorAllocate($image, 60,131,1);

$colorList[] = ImageColorAllocate($image, 0,0,0);

$fontcolor = ImageColorAllocate($image, 0,0,0);

$gray = ImageColorAllocate($image, 245,245,245);

$color = imagecolorallocate($image, 255,255,255);

$color2 = imagecolorallocate($image, 255,0,0);

imagefill($image, 0, 0, $gray);

$space = 15; // Character spacing

if($i > 0) // Mask the first frame

{

for ($k = 0; $k < strlen($authstr); $k++)

{

$colorRandom = mt_rand(0,sizeof($colorList)-1);

$float_top = rand(0,4);

$float_left = rand(0,3);

imagestring($image, 6, $space * $k, $top + $float_top, substr($authstr, $k, 1), $colorList[$colorRandom]);

}

}

for ($k = 0; $k < 20; $k++)

{

$colorRandom = mt_rand(0,sizeof($colorList)-1);

imagesetpixel($image, rand()%70 , rand()%15 , $colorList[$colorRandom]);

}

//Add interference line

for($k = 0; $k < 3; $k++)

{

$colorRandom = mt_rand(0, sizeof($colorList)-1);

// $todrawline = rand(0,1);

$todrawline = 1;

if($todrawline)

{

imageline($image, mt_rand(0, $board_width), mt_rand(0,$board_height), mt_rand(0,$board_width), mt_rand(0,$board_height), $colorList[$colorRandom]);

}

else

{

$w = mt_rand(0,$board_width);

$h = mt_rand(0,$board_width);

imagearc($image, $board_width - floor($w / 2) , floor($h / 2), $w, $h, rand(90,180), rand(180,270), $colorList[$colorRandom]);

}

}

imagegif($image);

imagedestroy($image);

$imagedata[] = ob_get_contents();

ob_clean();

++$i;

}

$gif = new GIFEncoder($imagedata);

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

echo $gif->GetAnimation();

}

GIFEncoder class source code:

Copy code The code is as follows:

Class GIFEncoder {
    var $GIF = "GIF89a";                /* GIF header 6 bytes        */
    var $VER = "GIFEncoder V2.06";        /* Encoder version                */
    var $BUF = Array ( );
    var $LOP =  0;
    var $DIS =  2;
    var $COL = -1;
    var $IMG = -1;
    var $ERR = Array (
    'ERR00' =>"Does not supported function for only one image!",
    'ERR01' =>"Source is not a GIF image!",
    'ERR02' =>"Unintelligible flag ",
    'ERR03' =>"Could not make animation from animated GIF source",
    );
    /*
    :::::::::::::::::::::::::::::::::::::::::::::::::::
    ::
    ::        GIFEncoder...
    ::
    */
    function GIFEncoder        (
    $GIF_src, $GIF_dly, $GIF_lop, $GIF_dis,
    $GIF_red, $GIF_grn, $GIF_blu, $GIF_mod
    ) {
        if ( ! is_array ( $GIF_src ) && ! is_array ( $GIF_tim ) ) {
            printf        ( "%s: %s", $this->VER, $this->ERR [ 'ERR00' ] );
            exit        ( 0 );
        }
        $this->LOP = ( $GIF_lop > -1 ) ? $GIF_lop : 0;
        $this->DIS = ( $GIF_dis > -1 ) ? ( ( $GIF_dis < 3 ) ? $GIF_dis : 3 ) : 2;
        $this->COL = ( $GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1 ) ?
        ( $GIF_red | ( $GIF_grn << 8 ) | ( $GIF_blu << 16 ) ) : -1;
        for ( $i = 0; $i < count ( $GIF_src ); $i++ ) {
            if ( strToLower ( $GIF_mod ) == "url" ) {
                $this->BUF [ ] = fread ( fopen ( $GIF_src [ $i ], "rb" ), filesize ( $GIF_src [ $i ] ) );
            }
            else if ( strToLower ( $GIF_mod ) == "bin" ) {
                $this->BUF [ ] = $GIF_src [ $i ];
            }
            else {
                printf        ( "%s: %s ( %s )!", $this->VER, $this->ERR [ 'ERR02' ], $GIF_mod );
                exit        ( 0 );
            }
            if ( substr ( $this->BUF [ $i ], 0, 6 ) != "GIF87a" && substr ( $this->BUF [ $i ], 0, 6 ) != "GIF89a" ) {
                printf        ( "%s: %d %s", $this->VER, $i, $this->ERR [ 'ERR01' ] );
                exit        ( 0 );
            }
            for ( $j = ( 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) ), $k = TRUE; $k; $j++ ) {
                switch ( $this->BUF [ $i ] { $j } ) {
                    case "!":
                        if ( ( substr ( $this->BUF [ $i ], ( $j + 3 ), 8 ) ) == "NETSCAPE" ) {
                            printf        ( "%s: %s ( %s source )!", $this->VER, $this->ERR [ 'ERR03' ], ( $i + 1 ) );
                            exit        ( 0 );
                        }
                        break;
                    case ";":
                        $k = FALSE;
                        break;
                }
            }
        }
        GIFEncoder::GIFAddHeader ( );
        for ( $i = 0; $i < count ( $this->BUF ); $i++ ) {
            GIFEncoder::GIFAddFrames ( $i, $GIF_dly [ $i ] );
        }
        GIFEncoder::GIFAddFooter ( );
    }
    /*
    :::::::::::::::::::::::::::::::::::::::::::::::::::
    ::
    ::        GIFAddHeader...
    ::
    */
    function GIFAddHeader ( ) {
        $cmap = 0;
        if ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x80 ) {
            $cmap = 3 * ( 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ) );
            $this->GIF .= substr ( $this->BUF [ 0 ], 6, 7                );
            $this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap        );
            $this->GIF .= "!/377/13NETSCAPE2.0/3/1" . GIFEncoder::GIFWord ( $this->LOP ) . "/0";
        }
    }
    /*
    :::::::::::::::::::::::::::::::::::::::::::::::::::
    ::
    ::        GIFAddFrames...
    ::
    */
    function GIFAddFrames ( $i, $d ) {
        $Locals_str = 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) );
        $Locals_end = strlen ( $this->BUF [ $i ] ) - $Locals_str - 1;
        $Locals_tmp = substr ( $this->BUF [ $i ], $Locals_str, $Locals_end );
        $Global_len = 2 << ( ord ( $this->BUF [ 0  ] { 10 } ) & 0x07 );
        $Locals_len = 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );
        $Global_rgb = substr ( $this->BUF [ 0  ], 13,
        3 * ( 2 << ( ord ( $this->BUF [ 0  ] { 10 } ) & 0x07 ) ) );
        $Locals_rgb = substr ( $this->BUF [ $i ], 13,
        3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) );
        $Locals_ext = "!/xF9/x04" . chr ( ( $this->DIS << 2 ) + 0 ) .
        chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . "/x0/x0";
        if ( $this->COL > -1 && ord ( $this->BUF [ $i ] { 10 } ) & 0x80 ) {
            for ( $j = 0; $j < ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ); $j++ ) {
                if        (
                ord ( $Locals_rgb { 3 * $j + 0 } ) == ( $this->COL >>  0 ) & 0xFF &
                ord ( $Locals_rgb { 3 * $j + 1 } ) == ( $this->COL >>  8 ) & 0xFF &
                ord ( $Locals_rgb { 3 * $j + 2 } ) == ( $this->COL >> 16 ) & 0xFF
                ) {
                    $Locals_ext = "!/xF9/x04" . chr ( ( $this->DIS << 2 ) + 1 ) .
                    chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . chr ( $j ) . "/x0";
                    break;
                }
            }
        }
        switch ( $Locals_tmp { 0 } ) {
            case "!":
                $Locals_img = substr ( $Locals_tmp, 8, 10 );
                $Locals_tmp = substr ( $Locals_tmp, 18, strlen ( $Locals_tmp ) - 18 );
                break;
            case ",":
                $Locals_img = substr ( $Locals_tmp, 0, 10 );
                $Locals_tmp = substr ( $Locals_tmp, 10, strlen ( $Locals_tmp ) - 10 );
                break;
        }
        if ( ord ( $this->BUF [ $i ] { 10 } ) & 0x80 && $this->IMG > -1 ) {
            if ( $Global_len == $Locals_len ) {
                if ( GIFEncoder::GIFBlockCompare ( $Global_rgb, $Locals_rgb, $Global_len ) ) {
                    $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );
                }
                else {
                    $byte  = ord ( $Locals_img { 9 } );
                    $byte |= 0x80;
                    $byte &= 0xF8;
                    $byte |= ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 );
                    $Locals_img { 9 } = chr ( $byte );
                    $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );
                }
            }
            else {
                $byte  = ord ( $Locals_img { 9 } );
                $byte |= 0x80;
                $byte &= 0xF8;
                $byte |= ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );
                $Locals_img { 9 } = chr ( $byte );
                $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );
            }
        }
        else {
            $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );
        }
        $this->IMG  = 1;
    }
    /*
    :::::::::::::::::::::::::::::::::::::::::::::::::::
    ::
    ::        GIFAddFooter...
    ::
    */
    function GIFAddFooter ( ) {
        $this->GIF .= ";";
    }
    /*
    :::::::::::::::::::::::::::::::::::::::::::::::::::
    ::
    ::        GIFBlockCompare...
    ::
    */
    function GIFBlockCompare ( $GlobalBlock, $LocalBlock, $Len ) {
        for ( $i = 0; $i < $Len; $i++ ) {
            if        (
            $GlobalBlock { 3 * $i + 0 } != $LocalBlock { 3 * $i + 0 } ||
            $GlobalBlock { 3 * $i + 1 } != $LocalBlock { 3 * $i + 1 } ||
            $GlobalBlock { 3 * $i + 2 } != $LocalBlock { 3 * $i + 2 }
            ) {
                return ( 0 );
            }
        }
        return ( 1 );
    }
    /*
    :::::::::::::::::::::::::::::::::::::::::::::::::::
    ::
    ::        GIFWord...
    ::
    */
    function GIFWord ( $int ) {
        return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) );
    }
    /*
    :::::::::::::::::::::::::::::::::::::::::::::::::::
    ::
    ::        GetAnimation...
    ::
    */
    function GetAnimation ( ) {
        return ( $this->GIF );
    }
}
?>

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/824715.htmlTechArticleI believe many people have thought about how to use PHP to generate GIF animations to implement dynamic image verification codes. The following is the implementation process. The PHP source code of GIF animation implemented by the ImageCode function through the GIFEncoder class, there are...
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

CakePHP Project Configuration CakePHP Project Configuration Sep 10, 2024 pm 05:25 PM

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

CakePHP Routing CakePHP Routing Sep 10, 2024 pm 05:25 PM

In this chapter, we are going to learn the following topics related to routing ?

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

CakePHP Creating Validators CakePHP Creating Validators Sep 10, 2024 pm 05:26 PM

Validator can be created by adding the following two lines in the controller.

See all articles