PHP验证码图片不能输出,该如何解决

PHP验证码图片不能输出
文件名 global_func.php

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->function _code(){//运行验证码    //随记码个数    $_rnd_code=4;    for($i=0;$i<$_rnd_code;$i++){        $_nmsg.=dechex(mt_rand(0, 15));    }    //保存在session中    $_SESSION['code']=$_nmsg;    //长和高    $_width=75;    $_height=25;    //创建一张图片    $_img=imagecreatetruecolor($_width,$_height);    //白色    $_white=imagecolorallocate($_img, 255, 255, 255);    //填充    imagefill($_img, 0, 0, $_white);    $_flag=false;    if($_flag){    //黑色,边框        $_black=imagecolorallocate($_img, 0,0,0);        imagerectangle($_img, 0,0, $_width-1,$_height-1,$_black);    }    //画出6个线条    for($i=0;$i<6;$i++){        $_rnd_color=imagecolorallocate($_img, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255));        imageline($_img,mt_rand(0,$_width),mt_rand(0,$_height),mt_rand(0,$_width),mt_rand(0,$_height), $_rnd_color);    }    //随即雪花    for($i;$i<100;$i++){        $_rnd_color=imagecolorallocate($_img,mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));        imagestring($_img,1, mt_rand(1, $_width),mt_rand(1,$_height), '*', $_rnd_color);        }    //输出验证码    for($i=0;$i<strlen($_SESSION['code']);$i++){        $_rnd_color=imagecolorallocate($_img, mt_rand(0, 100), mt_rand(0, 150), mt_rand(0, 200));        imagestring($_img,5,$i*$_width/$_rnd_code+mt_rand(1,10), mt_rand(1,$_height/2),$_SESSION['code'][$i],$_rnd_color);        }    //输出图像    header('Content-Type:image/png');    imagepng($_img);    //销毁    imagedestroy($_img);}

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PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->_code();

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PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->    //随记码个数    $_rnd_code=4;    for($i=0;$i<$_rnd_code;$i++){        $_nmsg.=dechex(mt_rand(0, 15));    }    //保存在session中    $_SESSION['code']=$_nmsg;    //长和高    $_width=75;    $_height=25;    //创建一张图片    $_img=imagecreatetruecolor($_width,$_height);    //白色    $_white=imagecolorallocate($_img, 255, 255, 255);    //填充    imagefill($_img, 0, 0, $_white);    $_flag=false;    if($_flag){    //黑色,边框        $_black=imagecolorallocate($_img, 0,0,0);        imagerectangle($_img, 0,0, $_width-1,$_height-1,$_black);    }    //画出6个线条    for($i=0;$i<6;$i++){        $_rnd_color=imagecolorallocate($_img, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255));        imageline($_img,mt_rand(0,$_width),mt_rand(0,$_height),mt_rand(0,$_width),mt_rand(0,$_height), $_rnd_color);    }    //随即雪花    for($i;$i<100;$i++){        $_rnd_color=imagecolorallocate($_img,mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));        imagestring($_img,1, mt_rand(1, $_width),mt_rand(1,$_height), '*', $_rnd_color);        }    //输出验证码    for($i=0;$i<strlen($_SESSION['code']);$i++){        $_rnd_color=imagecolorallocate($_img, mt_rand(0, 100), mt_rand(0, 150), mt_rand(0, 200));        imagestring($_img,5,$i*$_width/$_rnd_code+mt_rand(1,10), mt_rand(1,$_height/2),$_SESSION['code'][$i],$_rnd_color);        }    //输出图像    header('Content-Type:image/png');    imagepng($_img);    //销毁    imagedestroy($_img);

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PHP code

<?phpfunction _code(){//运行验证码}?><br><font color="#e78608">------解决方案--------------------<div class="clear"></div></font>

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