这篇是关于修改图片的效果,主要还是用到php中的GD库中的函数,没想到php还有这凶残能力,出乎我的预料。 先看代码upload_image.php,主要是一个上传控件,用来选择图片 html head title / title style type ="text/css" / style / head body form action ="
这篇是关于修改图片的效果,主要还是用到php中的GD库中的函数,没想到php还有这凶残能力,出乎我的预料。
先看代码upload_image.php,主要是一个上传控件,用来选择图片
<span><span>html</span><span>></span> <span><span>head</span><span>></span> <span><span>title</span><span>></span><span>title</span><span>></span> <span><span>style </span><span>type</span><span>="text/css"</span><span>></span><span>style</span><span>></span> <span></span><span>head</span><span>></span> <span><span>body</span><span>></span> <span><span>form </span><span>action</span><span>="check_image.php"</span><span> method</span><span>="post"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span> <span><span>table</span><span>></span> <span><span>tr</span><span>></span> <span><span>td</span><span>></span>Your username<span></span><span>td</span><span>></span> <span><span>td</span><span>><span>input </span><span>type</span><span>="text"</span><span> name</span><span>="username"</span> <span>/></span><span>td</span><span>></span> <span></span><span>tr</span><span>></span> <span><span>tr</span><span>></span> <span><span>td</span><span>></span>Upload image*<span></span><span>td</span><span>></span> <span><span>td</span><span>><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="uploadfile"</span><span>/></span><span>td</span><span>></span> <span></span><span>tr</span><span>></span> <span><span>tr</span><span>></span> <span><span>td </span><span>colspan</span><span>="2"</span><span>></span> <span><span>small</span><span>><span>em</span><span>></span> * Acceptable image formats include: GIF, JPG/JPEG and PNG.<span></span><span>em</span><span>></span><span>small</span><span>></span> <span></span><span>td</span><span>></span> <span></span><span>tr</span><span>></span> <span><span>tr</span><span>></span> <span><span>td</span><span>></span>Image Caption<span></span><span>td</span><span>></span> <span><span>td</span><span>><span>input </span><span>type</span><span>="text"</span><span> name</span><span>="caption"</span><span>/></span><span>td</span><span>></span> <span></span><span>tr</span><span>></span> <span><span>tr</span><span>></span> <span><span>td </span><span>colspan</span><span>="2"</span><span> style</span><span>="text-align:center;"</span><span>></span> <span><span>input </span><span>type</span><span>="submit"</span><span> name</span><span>="submit"</span><span> value</span><span>="Upload"</span> <span>/></span> <span></span><span>td</span><span>></span> <span></span><span>tr</span><span>></span> <span></span><span>table</span><span>></span> <span></span><span>form</span><span>></span> <span></span><span>body</span><span>></span> <span></span><span>html</span><span>></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
然后是上传和处理图片的逻辑check_image.php
<span>php </span><span>//</span><span>修改图片效果</span> <span>$db</span> = <span>mysql_connect</span>('localhost','root','Ctrip07185419') or <span>die</span>('can not connect to database'<span>); </span><span>mysql_select_db</span>('moviesite',<span>$db</span>) or <span>die</span>(<span>mysql_error</span>(<span>$db</span><span>)); </span><span>//</span><span>上传文件的路径</span> <span>$dir</span> = 'D:\Serious\phpdev\test\images'<span>; </span><span>//</span><span>upload_image.php页面传递过来的参数,如果是上传图片</span> <span>if</span>(<span>$_POST</span>['submit'] == 'Upload'<span>) { </span><span>if</span>(<span>$_FILES</span>['uploadfile']['error'] !=<span> UPLOAD_ERR_OK) { </span><span>switch</span>(<span>$_FILES</span>['uploadfiel']['error'<span>]) { </span><span>case</span> UPLOAD_ERR_INI_SIZE: <span>die</span>('The uploaded file exceeds the upload_max_filesize directive'<span>); </span><span>break</span><span>; </span><span>case</span> UPLOAD_ERR_FORM_SIZE: <span>die</span>('The upload file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form'<span>); </span><span>break</span><span>; </span><span>case</span> UPLOAD_ERR_PARTIAL: <span>die</span>('The uploaded file was only partially uploaded'<span>); </span><span>break</span><span>; </span><span>case</span> UPLOAD_ERR_NO_FILE: <span>die</span>('No file was uploaded'<span>); </span><span>break</span><span>; </span><span>case</span> UPLOAD_ERR_NO_TMP_DIR: <span>die</span>('The server is missing a temporary folder'<span>); </span><span>break</span><span>; </span><span>case</span> UPLOAD_ERR_CANT_WRITE: <span>die</span>('The server fail to write the uploaded file to the disk'<span>); </span><span>break</span><span>; </span><span>case</span> UPLOAD_ERR_EXTENSION: <span>die</span>('The upload stopped by extension'<span>); </span><span>break</span><span>; } } </span><span>$image_caption</span> = <span>$_POST</span>['caption'<span>]; </span><span>$image_username</span> = <span>$_POST</span>['username'<span>]; </span><span>$image_date</span> = <span>date</span>('Y-m-d'<span>); </span><span>list</span>(<span>$width</span>,<span>$height</span>,<span>$type</span>,<span>$attr</span>) = <span>getimagesize</span>(<span>$_FILES</span>['uploadfile']['tmp_name'<span>]); </span><span>$error</span> = 'The file you upload is not a supported filetype'<span>; </span><span>switch</span>(<span>$type</span><span>) { </span><span>case</span> IMAGETYPE_GIF: <span>$image</span> = imagecreatefromgif(<span>$_FILES</span>['uploadfile']['tmp_name']) or <span>die</span>(<span>$error</span><span>); </span><span>break</span><span>; </span><span>case</span> IMAGETYPE_JPEG: <span>$image</span> = imagecreatefromjpeg(<span>$_FILES</span>['uploadfile']['tmp_name']) or <span>die</span>(<span>$error</span><span>); </span><span>break</span><span>; </span><span>case</span> IMAGETYPE_PNG: <span>$image</span> = imagecreatefrompng(<span>$_FILES</span>['uploadfile']['tmp_name']) or <span>die</span>(<span>$error</span><span>); </span><span>break</span><span>; </span><span>default</span>: <span>break</span><span>; } </span><span>$query</span> = 'insert into images(image_caption,image_username,image_date) values("'.<span>$image_caption</span>.'" , "'.<span>$image_username</span>.'","'.<span>$image_date</span>.'")'<span>; </span><span>$result</span> = <span>mysql_query</span>(<span>$query</span>,<span>$db</span>) or <span>die</span>(<span>mysql_error</span>(<span>$db</span><span>)); </span><span>$last_id</span> = <span>mysql_insert_id</span><span>(); </span><span>//</span><span> $imagename = $last_id.'.jpg'; // imagejpeg($image,$dir.'/'.$imagename); // imagedestroy($image);</span> <span>$image_id</span> = <span>$last_id</span><span>; imagejpeg(</span><span>$image</span> , <span>$dir</span>.'/'.<span>$image_id</span>.'.jpg'<span>); imagedestroy(</span><span>$image</span><span>); } </span><span>else</span> <span>//</span><span>如果图片已经上传,则从数据库中取图片名字</span> <span>{ </span><span>$query</span> = 'select image_id,image_caption,image_username,image_date from images where image_id='.<span>$_POST</span>['id'<span>]; </span><span>$result</span> = <span>mysql_query</span>(<span>$query</span>,<span>$db</span>) or <span>die</span>(<span>mysql_error</span>(<span>$db</span><span>)); </span><span>extract</span>(<span>mysql_fetch_assoc</span>(<span>$result</span><span>)); </span><span>list</span>(<span>$width</span>,<span>$height</span>,<span>$type</span>,<span>$attr</span>) = <span>getimagesize</span>(<span>$dir</span>.'/'.<span>$image_id</span>.'.jpg'<span>); } </span><span>//</span><span>如果是保存图片</span> <span>if</span>(<span>$_POST</span>['submit'] == 'Save'<span>) { </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['id']) && <span>ctype_digit</span>(<span>$_POST</span>['id']) && <span>file_exists</span>(<span>$dir</span>.'/'.<span>$_POST</span>['id'].'.jpg'<span>)) { </span><span>$image</span> = imagecreatefromjpeg(<span>$dir</span>.'/'.<span>$_POST</span>['id'].'.jpg'<span>); } </span><span>else</span><span> { </span><span>die</span>('invalid image specified'<span>); } </span><span>$effect</span> = (<span>isset</span>(<span>$_POST</span>['effect'])) ? <span>$_POST</span>['effect'] : -1<span>; </span><span>switch</span>(<span>$effect</span><span>) { </span><span>case</span> IMG_FILTER_NEGATE:<span> imagefilter(</span><span>$image</span> , IMG_FILTER_NEGATE); <span>//</span><span>将图像中所有颜色反转</span> <span>break</span><span>; </span><span>case</span> IMG_FILTER_GRAYSCALE:<span> imagefilter(</span><span>$image</span> , IMG_FILTER_GRAYSCALE); <span>//</span><span>将图像转换为灰度的</span> <span>break</span><span>; </span><span>case</span> IMG_FILTER_EMBOSS:<span> imagefilter(</span><span>$image</span> , IMG_FILTER_EMBOSS); <span>//</span><span>使图像浮雕化</span> <span>break</span><span>; </span><span>case</span> IMG_FILTER_GAUSSIAN_BLUR:<span> imagefilter(</span><span>$image</span> , IMG_FILTER_GAUSSIAN_BLUR); <span>//</span><span>用高斯算法模糊图像</span> <span>break</span><span>; } imagejpeg(</span><span>$image</span> , <span>$dir</span>.'/'.<span>$_POST</span>['id'].'.jpg' , 100<span>); </span>?> <title>Here is your pic!</title> <h1 id="Your-image-has-been-saved">Your image has been saved!</h1> <img src="images/<?php%20echo%20<span>%24_POST</span>%5B'id'%5D;?>.jpg" alt=""> <span>php } </span><span>else</span><span> { </span>?> <title>Here is your pic!</title> <h1 id="So-how-does-it-feel-to-be-famous">So how does it feel to be famous?</h1> <p>Here is the picture you just uploaded to your servers:</p> <!--<img src="images/<?php echo <span alt="PHP修改图片" >$imagename</span>;?>" alt="" style="max-width:90%" />--> <span>php </span><span>if</span>(<span>$_POST</span>['submit'] == 'Upload'<span>) { </span><span>$imagename</span> = 'images/'.<span>$image_id</span>.'.jpg'<span>; } </span><span>else</span><span> { </span><span>$imagename</span> = 'image_effect.php?id='.<span>$image_id</span>.'&e='.<span>$_POST</span>['effect'<span>]; } </span>?> <img src="<?php%20echo%20<span>%24imagename</span>;?>" style="max-width:90%" alt="">
Image save as: | $image_id?> |
Height: | echo $height;?> |
Widht: | echo $width;?> |
Upload date: | echo $image_date;?> |
You may apply a special effect to your image from the list of option below. Note:saving an image with any of the filters applied can be undone
php } ?>最后是一个预览效果的页面image_effect.php
<span>php </span><span>$dir</span> = 'D:\Serious\phpdev\test\images'<span>; </span><span>if</span>(<span>isset</span>(<span>$_GET</span>['id']) && <span>ctype_digit</span>(<span>$_GET</span>['id']) && <span>file_exists</span>(<span>$dir</span>.'/'.<span>$_GET</span>['id'].'.jpg'<span>)) { </span><span>$image</span> = imagecreatefromjpeg(<span>$dir</span>.'/'.<span>$_GET</span>['id'].'.jpg'<span>); } </span><span>else</span><span> { </span><span>die</span>('invalid image specified'<span>); } </span><span>$effect</span> = (<span>isset</span>(<span>$_GET</span>['e'])) ? <span>$_GET</span>['e'] : -1<span>; </span><span>switch</span>(<span>$effect</span><span>) { </span><span>case</span> IMG_FILTER_NEGATE:<span> imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_NEGATE); </span><span>break</span><span>; </span><span>case</span> IMG_FILTER_GRAYSCALE:<span> imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_GRAYSCALE); </span><span>break</span><span>; </span><span>case</span> IMG_FILTER_EMBOSS:<span> imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_EMBOSS); </span><span>break</span><span>; </span><span>case</span> IMG_FILTER_GAUSSIAN_BLUR:<span> imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_GAUSSIAN_BLUR); </span><span>break</span><span>; } </span><span>header</span>('Content-Type:image/jpeg'<span>); imagejpeg(</span><span>$image</span> , '' , 100<span>); </span>?>
第二个image_check.php有点乱,在这个页面中有上传图片,处理图片,还有预览图片的部分逻辑,注意下面这段
<span>php </span><span>if</span>(<span>$_POST</span>['submit'] == 'Upload'<span>) { </span><span>$imagename</span> = 'images/'.<span>$image_id</span>.'.jpg'<span>; } </span><span>else</span><span> { </span><span>$imagename</span> = 'image_effect.php?id='.<span>$image_id</span>.'&e='.<span>$_POST</span>['effect'<span>]; } </span>?> <img src="<?php%20echo%20<span>%24imagename</span>;?>" style="max-width:90%" alt="">
如果是上传直接访问图片,如果是预览则从image_effect.php中读取图片,这里是从内存中读取图片并根据选择的处理效果来展示图片。如下
<span>switch</span>(<span>$effect</span><span>) { </span><span>case</span> IMG_FILTER_NEGATE:<span> imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_NEGATE); </span><span>break</span><span>; </span><span>case</span> IMG_FILTER_GRAYSCALE:<span> imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_GRAYSCALE); </span><span>break</span><span>; </span><span>case</span> IMG_FILTER_EMBOSS:<span> imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_EMBOSS); </span><span>break</span><span>; </span><span>case</span> IMG_FILTER_GAUSSIAN_BLUR:<span> imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_GAUSSIAN_BLUR); </span><span>break</span><span>; }</span>
当使用imagefilter方法处理图片之后会把图片输出到页面,这里要注意imagejpeg方法的第二个参数是空字符串,这样它就不会写入到硬盘中了,如果第二个参数设置了会覆盖原有的图片,这样可以让用户在保存图片之前随意的预览效果,如下:
<span>header</span>('Content-Type:image/jpeg'<span>); imagejpeg(</span><span>$image</span> , '' , 100);
在check_image.php中有调用到类似的方法,但是这里指定了第二个参数,就是用来保存图片的:
imagejpeg(<span>$image</span> , <span>$dir</span>.'/'.<span>$_POST</span>['id'].'.jpg' , 100);
注意这里哦我们只写了三种处理效果,这个只是所有枚举中的一部分,我们来看所有的处理方式:
IMG_FILTER_NEGATE:将图像中所有颜色反转。
IMG_FILTER_GRAYSCALE:将图像转换为灰度的。
IMG_FILTER_BRIGHTNESS:改变图像的亮度。用 arg1 设定亮度级别。
IMG_FILTER_CONTRAST:改变图像的对比度。用 arg1 设定对比度级别。
IMG_FILTER_COLORIZE:与 IMG_FILTER_GRAYSCALE 类似,不过可以指定颜色。用 arg1,arg2 和 arg3 分别指定 red,blue 和 green。每种颜色范围是 0 到 255。
IMG_FILTER_EDGEDETECT:用边缘检测来突出图像的边缘。
IMG_FILTER_EMBOSS:使图像浮雕化。
IMG_FILTER_GAUSSIAN_BLUR:用高斯算法模糊图像。
IMG_FILTER_SELECTIVE_BLUR:模糊图像。
IMG_FILTER_MEAN_REMOVAL:用平均移除法来达到轮廓效果。
IMG_FILTER_SMOOTH:使图像更柔滑。用 arg1 设定柔滑级别。
是不是很惊艳,php很强大的。

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。


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