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php正则匹配文章中的远程图片地址并下载图片到本地

Jun 13, 2016 am 11:28 AM
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今天在做一个简单的采集程序需要下载对方网站内容,然后把内容中的图片再保存在本地服务器上,下面我来给各位同介绍我的具体操作方法,下载图片主要用到了file_get_contents 函数,具体方法如下。


这里我们使用php的正则表达式来实现:

 代码如下 复制代码
$content = '这里是文章内容,这里插入一张图片测试 php正则匹配文章中的远程图片地址并下载图片到本地';
$content = stripslashes ( $content );
$img_array = array ();
// 匹配所有远程图片
preg_match_all ( "/(src|SRC)=["|'| ]{0,}(http://(.*).(gif|jpg|jpeg|bmp|png))/isU", $content, $img_array );
// 匹配出来的不重复图片
$img_array = array_unique ( $img_array [2] );
print_r($img_array);

上面就将远程图片给匹配出来了,我们需要将其保持到本地。这里需要注意两点:

1.图片保存路径(图片存储目录)

2.实际访问图片地址

下面是完整实例:(你可以保存到本地服务器修改相应地方进行测试)

 代码如下 复制代码





php保存远程图片到本地,php正则匹配文章中的图片地址


//保存文章中远程图片到本地
//作者:yanue;
// 文件保存目录路径(请更换为你自己的路径, 你可以echo一下)
$save_path = $_SERVER ['DOCUMENT_ROOT'] . 'swfupload/attached/';
// 文件保存目录URL
$save_url = '/swfupload/attached/';
$save_path = realpath ( $save_path ) . '/';
// 图片存储目录
$imgPath = $save_path . date ( "Ymd" );
$imgUrl = $save_url . date ( "Ymd" );

// 创建文件夹
if (! is_dir ( $imgPath )) {
 @mkdir ( $imgPath, 0777 );
}
$content = '这里是文章内容,这里插入一张图片测试 php正则匹配文章中的远程图片地址并下载图片到本地';
$content = stripslashes ( $content );
$img_array = array ();
// 匹配所有远程图片
preg_match_all ( "/(src|SRC)=["|'| ]{0,}(http://(.*).(gif|jpg|jpeg|bmp|png))/isU", $content, $img_array );
// 匹配出来的不重复图片
$img_array = array_unique ( $img_array [2] );
print_r($img_array);
// 时间无限制
set_time_limit ( 0 );
foreach ( $img_array as $key => $value ) {
 $value = trim ( $value );
 // 读取远程图片
 $get_file = @file_get_contents ( $value );
 // 保存到本地图片名称
 $imgname = date ( "YmdHis" ) . '_' . rand ( 10000, 99999 ) . "." . substr ( $value, - 3, 3 );
 // 保存到本地的实际文件地址(包含路径和名称)
 $fileName = $imgPath . '/' . $imgname;
 // 实际访问的地址
 $fileurl = $imgUrl . "/" . $imgname;
 // 文件写入
 if ($get_file) {
  $fp = @fopen ( $fileName, "w" );
  @fwrite ( $fp, $get_file );
  @fclose ( $fp );
 }
 // 替换原来的图片地址
 $content = ereg_replace ( $value, $fileurl, $content );
}
echo $content;
?>


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