如圖，我在image.func.php中輸出getCaptcha();是能夠正常顯示驗證碼的但是，我在新建的getCaptcha.php中調(diào)用image.func.php再使用getCaptcha()的時候卻報錯了，這是為什么？？image.func.php中的代碼：<?php ????function?getCaptcha($type?=?3,$length?=?4,$pixel?=?30,$line?=?0){ session_start(); ????//創(chuàng)建底圖 ????$width?=?80; ????$height?=?30; ????$image?=?imagecreatetruecolor($width,?$height); ????$white?=?imagecolorallocate($image,?255,?255,?255); ????$black?=?imagecolorallocate($image,?0,?0,?0); ????//填充畫布 ????//imagefilledrectangle($image,?1,?1,?$width-2,?$height-2,?$white); ????imagefill($image,?0,?0,?$white); ???? ????//獲取驗證碼字段，儲存在session中 ????$type?=?3; ????$length?=?4; ????$chars?=?buildRandomString($type,$length); ????$sess_name?=?"captcha"; ????$_SESSION[$sess_name]?=?$chars; ????$fontfiles?=?array("arial.ttf","ariblk.ttf","simkai.ttf","SIMLI.TTF","simsun.ttc","STLITI.TTF"); ????for?($i=0;?$i?<?$length;?$i++)?{? ???? $fontsize?=?mt_rand(12,18); ???? $angle?=?mt_rand(-15,15); ???? $x?=?($i*15)?+?mt_rand(2,5); ???? $y?=?mt_rand(15,25); ???? $color?=?imagecolorallocate($image,?mt_rand(50,150),?mt_rand(50,150),?mt_rand(50,150)); ???? $font?=?"../fonts/"?.?$fontfiles[mt_rand(0,count($fontfiles)-1)]; ???? $text?=?substr($chars,?$i,?1); ???? imagettftext($image,?$fontsize,?$angle,?$x,?$y,?$color,?$font,?$text); ???? ????} ???? ????//創(chuàng)建干擾元素 ????if($pixel){ ????for?($i=0;?$i?<?$pixel;?$i++)?{? ???? $jamColor?=?imagecolorallocate($image,?mt_rand(100,220),?mt_rand(100,220),?mt_rand(100,220)); ???? imagesetpixel($image,?mt_rand(0,$width-1),?mt_rand(0,$height-1),?$jamColor); ????} } if($line){ for?($i=0;?$i?<?$line;?$i++)?{? $jamColor?=?imagecolorallocate($image,?mt_rand(100,220),?mt_rand(100,220),?mt_rand(100,220)); imageline($image,?mt_rand(0,$width-1),?mt_rand(0,$height-1),?mt_rand(0,$width-1),?mt_rand(0,$height-1),?$jamColor); } } ob_clean(); header('content-type:image/png'); imagepng($image); imagedestroy($image); } getCaptcha();getCaptcha.php的代碼：<?php ????require_once?'lib/image.func.php'; ????getCaptcha();