这是一个用PHP生成GIF动画来实现动态图片验证码的程序，非常实用，是php用户注册登录界面经常需要用到的验证码程序，有需要GIF动态图片验证码功能的朋友可以收藏一下。
第一步：创建ImageCode.php文件，验证码生成函数代码如下：
<"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 $ERR = Array (
'ERR00' =>"Does not supported function for only one image!",
'ERR01' =>"Source is not a GIF image!",
'ERR02' =>"Unintelligible flag ",
'ERR03' =>"Could not make animation from animated GIF source",
);
function GIFEncoder ($GIF_src, $GIF_dly = 100, $GIF_lop = 0, $GIF_dis = 0, $GIF_red = 0, $GIF_grn = 0, $GIF_blu = 0, $GIF_mod = 'bin' )
{
if (!is_array($GIF_src) && !is_array($GIF_tim))
{
printf ( "%s: %s", $this->VER, $this->ERR['ERR00']);
exit( 0 );
}
$this->LOP = ($GIF_lop > -1) "url")
{
$this->BUF[] = fread (fopen($GIF_src [$i], "rb"), filesize ($GIF_src [$i]));
}
elseif(strToLower($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, $count_buf = count($this->BUF); $i < $count_buf; $i++)
{
GIFEncoder::GIFAddFrames($i, $GIF_dly[$i]);
}
GIFEncoder::GIFAddFooter();
}
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";
}
}
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;
}
function GIFAddFooter ( ) {
$this->GIF .= ";";
}
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 );
}
function GIFWord ( $int )
{
return ( chr ( $int & 0xFF ) . chr ( ( $int 8 ) & 0xFF ) );
}
function GetAnimation ( )
{
return ($this->GIF);
}
}
第二步：验证码生成，创建yzimg.php，并引用入文件ImageCode.php。代码如下：
<"ImageCode.php");
unset($_SESSION['yzm']);
$randCode = '';
$chars = 'abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPRSTUVWXYZ23456789';
for ( $i = 0; $i < 4; $i++ )
{
$randCode .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
}
$_SESSION['yzm']=$randCode; // 记录session
ImageCode($randCode, 60);
/*方法二*/
/*$authstr = mt_rand(1000, 9999); // 生成随机字符串
$_SESSION['yzm'] = $authstr; // 记录session
ImageCode($authstr, 60); // 显示GIF动画*/
"htmlcode">
<input name="yzm" type="text" class="input1" size="12" style="width:70px;"/>
<SCRIPT LANGUAGE="JavaScript">
<!--
document.write('<img id="yz_Img" name="imageField" class="yz_Img" title="刷新验证码" onclick="this.src=this.src+Math.random();" src="/UploadFiles/2021-04-02/yzimg.php">
以上就是为大家分享的如何使用php生成动态验证码的相应代码，希望对大家的学习有所帮助。
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