php生成图片与验证码图片生成原理
这款php生成图片与验证码图片生成原理代码,是由php gd库来支持,如果你的系统不能创建图片就把gd.dll前面的;去再,重起apache,如果是iis重起iis就OK了.创建图片后记得用ImageDestroy 清空内存.
php生成图片与验证码图片实例代码如下:
$w?$RESIZEWIDTH=$w:$RESIZEWIDTH=400;// 生成图片的宽度 $h?$RESIZEHEIGHT=$h:$RESIZEHEIGHT=400;// 生成图片的高度 <?php function ResizeImage($im, $maxwidth, $maxheight, $name) { $width = imagesx($im); $height = imagesy($im); if (($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)) { if ($maxwidth && $width > $maxwidth) { $widthratio = $maxwidth / $width; $RESIZEWIDTH = true; //www.phprm.com } if ($maxheight && $height > $maxheight) { $heightratio = $maxheight / $height; $RESIZEHEIGHT = true; } if ($RESIZEWIDTH && $RESIZEHEIGHT) { if ($widthratio < $heightratio) { $ratio = $widthratio; } else { $ratio = $heightratio; } } elseif ($RESIZEWIDTH) { $ratio = $widthratio; } elseif ($RESIZEHEIGHT) { $ratio = $heightratio; } $newwidth = $width * $ratio; $newheight = $height * $ratio; if (function_exists("imagecopyresampled")) { $newim = imagecreatetruecolor($newwidth, $newheight); imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); } else { $newim = imagecreate($newwidth, $newheight); imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); } ImageJpeg($newim, $name); ImageDestroy($newim); } else { ImageJpeg($im, $name); } } if ($_FILES['uploadfile']['size']) { if ($_FILES['uploadfile']['type'] == "image/pjpeg") { $im = imagecreatefromjpeg($_FILES['uploadfile']['tmp_name']); } elseif ($_FILES['uploadfile']['type'] == "image/x-png") { $im = imagecreatefrompng($_FILES['uploadfile']['tmp_name']); } elseif ($_FILES['uploadfile']['type'] == "image/gif") { $im = imagecreatefromgif($_FILES['uploadfile']['tmp_name']); } if ($im) { if (file_exists('bbs.jpg')) { unlink('www.phprm.com.jpg'); } ResizeImage($im, $RESIZEWIDTH, $RESIZEHEIGHT, 'bbs.jpg'); ImageDestroy($im); } } //$uploadfile="bbs.jpg";
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