php图像处理函数大全
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php图片处理代码分享，包括缩放、剪裁、缩放、翻转、旋转、透明、锐化等。需要的朋友可以参考下
一、创建图片资源
imagecreatetruecolor(width,height);
imagecreatefromgif(图片名称);
imagecreatefrompng(图片名称);
imagecreatefromjpeg(图片名称);画出各种图像
imagegif(图片资源,保存路径);
imagepng()
imagejpeg();
二、获取图片属性
imagesx(res//宽度
imagesy(res//高度
getimagesize(文件路径)
返回一个具有四个单元的数组。索引
0 包含图像宽度的像素值，索引 1 包含图像高度的像素值。索引 2 是图像类型的标记：1 = GIF，2 = JPG，3 = PNG，4 = SWF，5 =
PSD，6 = BMP，7 = TIFF(intel byte order)，8 = TIFF(motorola byte order)，9 = JPC，10
= JP2，11 = JPX，12 = JB2，13 = SWC，14 = IFF，15 = WBMP，16 = XBM。这些标记与 PHP 4.3.0 新加的
IMAGETYPE 常量对应。索引 3 是文本字符串，内容为“height="yyy" width="xxx"”，可直接用于 IMG
标记。
销毁图像资源
imagedestroy(图片资源);
三、透明处理
PNG、jpeg透明色都正常，只有gif不正常
imagecolortransparent(resource
image [,int
color])//将某个颜色设置成透明色
imagecolorstotal()
imagecolorforindex();
四、图片的裁剪
imagecopyresized()
imagecopyresampled();
五、加水印（文字、图片）
字符串编码转换string iconv ( string $in_charset ,
string $out_charset , string $str )
六、图片旋转
imagerotate();//制定角度的图片翻转
七、图片的翻转
沿X轴 沿Y轴翻转
八、锐化
imagecolorsforindex()
imagecolorat()
可以使用getimagesize() 函数。
代码如下：
$arr = getimagesize("book.jpg");
print_r($arr);
输出：
Array (
[0] = 134 //宽度
[1] = 170 //高度
[2] = 2 //代表jpg
[3] = width="134" height="170"
[bits] = 8
[channels] = 3
[mime] = image/jpeg
)
先来了解什么是图片的Exif信息
Exif是一种图象文件格式，它的数据存储与JPEG格式是完全相同的。
实际上Exif格式就是在JPEG格式头部插入了数码照片的信息，包括拍摄时的光圈、快门、白平衡、ISO、焦距、日期时间等各种和拍摄条件以及相机品牌、型号、色彩编码、拍摄时录制的声音以及全球定位系统（GPS）、缩略图等。简单地说，Exif=JPEG+拍摄参数。
因此，你可以利用任何可以查看JPEG文件的看图软件浏览Exif格式的照片，但并不是所有的图形程序都能处理Exif信息。
具体代码你可以参考下面的
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/**
* 获取图象信息的函数
* 一个全面获取图象信息的函数
* @access public
* @param string $img 图片路径
* @return array
*/
function GetImageInfoVal($ImageInfo,$val_arr) {
$InfoVal = "未知";
foreach($val_arr as $name=$val) {
if ($name==$ImageInfo) {
$InfoVal = $val;
break;
}
}
return $InfoVal;
}
function GetImageInfo($img) {
$imgtype = array("", "GIF", "JPG", "PNG", "SWF", "PSD", "BMP", "TIFF(intel byte order)", "TIFF(motorola byte order)", "JPC", "JP2", "JPX", "JB2", "SWC", "IFF", "WBMP", "XBM");
$Orientation = array("", "top left side", "top right side", "bottom right side", "bottom left side", "left side top", "right side top", "right side bottom", "left side bottom");
$ResolutionUnit = array("", "", "英寸", "厘米");
$YCbCrPositioning = array("", "the center of pixel array", "the datum point");
$ExposureProgram = array("未定义", "手动", "标准程序", "光圈先决", "快门先决", "景深先决", "运动模式", "肖像模式", "风景模式");
$MeteringMode_arr = array(
"0" = "未知",
"1" = "平均",
"2" = "中央重点平均测光",
"3" = "点测",
"4" = "分区",
"5" = "评估",
"6" = "局部",
"255" = "其他"
);
$Lightsource_arr = array(
"0" = "未知",
"1" = "日光",
"2" = "荧光灯",
"3" = "钨丝灯",
"10" = "闪光灯",
"17" = "标准灯光A",
"18" = "标准灯光B",
"19" = "标准灯光C",
"20" = "D55",
"21" = "D65",
"22" = "D75",
"255" = "其他"
);
$Flash_arr = array(
"0" = "flash did not fire",
"1" = "flash fired",
"5" = "flash fired but strobe return light not detected",
"7" = "flash fired and strobe return light detected",
);
$exif = exif_read_data ($img,"IFD0");
if ($exif===false) {
$new_img_info = array ("文件信息" = "没有图片EXIF信息");
}
else
{
$exif = exif_read_data ($img,0,true);
$new_img_info = array (
"文件信息" = "-----------------------------",
"文件名" = $exif[FILE][FileName],
"文件类型" = $imgtype[$exif[FILE][FileType]],
"文件格式" = $exif[FILE][MimeType],
"文件大小" = $exif[FILE][FileSize],
"时间戳" = date("Y-m-d H:i:s",$exif[FILE][FileDateTime]),
"图像信息" = "-----------------------------",
"图片说明" = $exif[IFD0][ImageDescription],
"制造商" = $exif[IFD0][Make],
"型号" = $exif[IFD0][Model],
"方向" = $Orientation[$exif[IFD0][Orientation]],
"水平分辨率" = $exif[IFD0][XResolution].$ResolutionUnit[$exif[IFD0][ResolutionUnit]],
"垂直分辨率" = $exif[IFD0][YResolution].$ResolutionUnit[$exif[IFD0][ResolutionUnit]],
"创建软件" = $exif[IFD0][Software],
"修改时间" = $exif[IFD0][DateTime],
"作者" = $exif[IFD0][Artist],
"YCbCr位置控制" = $YCbCrPositioning[$exif[IFD0][YCbCrPositioning]],
"版权" = $exif[IFD0][Copyright],
"摄影版权" = $exif[COMPUTED][Copyright.Photographer],
"编辑版权" = $exif[COMPUTED][Copyright.Editor],
"拍摄信息" = "-----------------------------",
"Exif版本" = $exif[EXIF][ExifVersion],
"FlashPix版本" = "Ver. ".number_format($exif[EXIF][FlashPixVersion]/100,2),
"拍摄时间" = $exif[EXIF][DateTimeOriginal],
"数字化时间" = $exif[EXIF][DateTimeDigitized],
"拍摄分辨率高" = $exif[COMPUTED][Height],
"拍摄分辨率宽" = $exif[COMPUTED][Width],
/*
The actual aperture value of lens when the image was taken.
Unit is APEX.
To convert this value to ordinary F-number(F-stop),
calculate this value's power of root 2 (=1.4142).
For example, if the ApertureValue is '5', F-number is pow(1.41425,5) = F5.6.
*/
"光圈" = $exif[EXIF][ApertureValue],
"快门速度" = $exif[EXIF][ShutterSpeedValue],
"快门光圈" = $exif[COMPUTED][ApertureFNumber],
"最大光圈值" = "F".$exif[EXIF][MaxApertureValue],
"曝光时间" = $exif[EXIF][ExposureTime],
"F-Number" = $exif[EXIF][FNumber],
"测光模式" = GetImageInfoVal($exif[EXIF][MeteringMode],$MeteringMode_arr),
"光源" = GetImageInfoVal($exif[EXIF][LightSource], $Lightsource_arr),
"闪光灯" = GetImageInfoVal($exif[EXIF][Flash], $Flash_arr),
"曝光模式" = ($exif[EXIF][ExposureMode]==1?"手动":"自动"),
"白平衡" = ($exif[EXIF][WhiteBalance]==1?"手动":"自动"),
"曝光程序" = $ExposureProgram[$exif[EXIF][ExposureProgram]],
/*
Brightness of taken subject, unit is APEX. To calculate Exposure(Ev) from BrigtnessValue(Bv), you must add SensitivityValue(Sv).
Ev=Bv+Sv Sv=log((ISOSpeedRating/3.125),2)
ISO100:Sv=5, ISO200:Sv=6, ISO400:Sv=7, ISO125:Sv=5.32.
*/
"曝光补偿" = $exif[EXIF][ExposureBiasValue]."EV",
"ISO感光度" = $exif[EXIF][ISOSpeedRatings],
"分量配置" = (bin2hex($exif[EXIF][ComponentsConfiguration])=="01020300"?"YCbCr":"RGB"),//'0x04,0x05,0x06,0x00'="RGB" '0x01,0x02,0x03,0x00'="YCbCr"
"图像压缩率" = $exif[EXIF][CompressedBitsPerPixel]."Bits/Pixel",
"对焦距离" = $exif[COMPUTED][FocusDistance]."m",
"焦距" = $exif[EXIF][FocalLength]."mm",
"等价35mm焦距" = $exif[EXIF][FocalLengthIn35mmFilm]."mm",
/*
Stores user comment. This tag allows to use two-byte character code or unicode. First 8 bytes describe the character code. 'JIS' is a Japanese character code (known as Kanji).
'0x41,0x53,0x43,0x49,0x49,0x00,0x00,0x00':ASCII
'0x4a,0x49,0x53,0x00,0x00,0x00,0x00,0x00':JIS
'0x55,0x4e,0x49,0x43,0x4f,0x44,0x45,0x00':Unicode
'0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00':Undefined
*/
"用户注释编码" = $exif[COMPUTED][UserCommentEncoding],
"用户注释" = $exif[COMPUTED][UserComment],
"色彩空间" = ($exif[EXIF][ColorSpace]==1?"sRGB":"Uncalibrated"),
"Exif图像宽度" = $exif[EXIF][ExifImageLength],
"Exif图像高度" = $exif[EXIF][ExifImageWidth],
"文件来源" = (bin2hex($exif[EXIF][FileSource])==0x03?"digital still camera":"unknown"),
"场景类型" = (bin2hex($exif[EXIF][SceneType])==0x01?"A directly photographed image":"unknown"),
"缩略图文件格式" = $exif[COMPUTED][Thumbnail.FileType],
"缩略图Mime格式" = $exif[COMPUTED][Thumbnail.MimeType]
);
}
return $new_img_info;
}
$innerhtml = "";
$exif = GetImageInfo($_GET['img']);
$innerhtml .= "TABLE";
foreach($exif as $name=$val) {
$innerhtml .= "TRTD{$name}/TDTD{$val}/TD/TR";
}
$innerhtml .= "TRTD colspan=\"2\"";
if ($_GET['img']) {
$image = exif_thumbnail($_GET['img']);
} else {
$image = false;
}
if ($image!==false) {
$innerhtml .= "img src=\"thumbnail.php?img=".$_GET['img']."\"";
} else {
// no thumbnail available, handle the error here
$innerhtml .= "No thumbnail available";
}
$innerhtml .= "/TD/TR/TABLE";
?
html
head
title图片信息/title
meta http-equiv="Content-Type" content="text/html; charset=??????"
/head
body
SCRIPT
!--
//初始化内容值
parent.followTd?=$_GET['r_id'];?.innerHTML='?=$innerhtml;?';
//已读取
parent.document.images.followImg?=$_GET['r_id'];?.loaded='yes';
--
/SCRIPT
/body
/html
用glob很方便就可获得。
$img = array('gif','png','jpg');//所有图片的后缀名
$dir = 'data/';//文件夹名称
$pic = array();
foreach($img as $k=$v)
{
$pattern = $dir.'*.'.$v;
$all = glob($pattern);
$pic = array_merge($pic,$all);
}
foreach($pic as $p)
{
//分行分页显示代码
}
如果和图片是同一个文件夹，那要将
$dir = 'data/';//文件夹名称
改成
$dir = './';//文件夹名称
$str = CODE
img width="100" id="ab_0" name="ab_0" height="80" src="images/ab.jpg" /
CODE;
preg_match('/(?=src="images\/)[a-z.]+/i',$str,$arr);
print_r($arr);
?php
//将图片存进数据库再读出，注意存储图片的字段类型必须为blob
$user=’root’;
$password=’root’;
$db=’test’;
$connect=mysql_connect(‘localhost’,$user,$password);
mysql_set_charset(‘utf8′,$connect);
mysql_select_db($db);
$photo = “0x”.bin2hex(file_get_contents(“./test.jpg”));
$sql=”INSERT INTO `test`.`test` (`photo`) VALUES ($photo);”;//$photo不需要用引号，切记
mysql_query($sql);
//$result=mysql_query(“SELECT *
//FROM `test`
//LIMIT 0 , 30〃);
//$img=mysql_fetch_array($result);
//echo $img['photo'];
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