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HomeBackend DevelopmentPHP TutorialCURL采集远程图片到本地时,图片漏采了怎么处理

远程图片保存到本地需要一定的时间,而采集一下子就会采集上百篇,这就导致很多图片还没来的及保存到本地,就开始采集下一条。

不设置采集间隔时间,用PHP能不能解决这个问题,只在图片保存到本地执行完成后再继续执行下一条


回复讨论(解决方案)

你是多线程的采集吗?
最好贴出相关代码

 如果只是解决漏采问题,循环多get几次就好,有时是对方服务器不稳定

function curl_get($url) {	$filename = time ();	$curl = curl_init ();	curl_setopt ( $curl, CURLOPT_URL, $url );	curl_setopt ( $curl, CURLOPT_RETURNTRANSFER, true );	$data = curl_exec ( $curl );	curl_close ( $curl );	$file_extension = image_type ( $url );	$filename .= '.' . $file_extension;		$fp = fopen ( './zzz/' . $filename, "w" );	fwrite ( $fp, $data );	fclose ( $fp );}$content = file_get_contents ( 'img.txt' );$arr = explode ( "\r\n", $content );foreach ( $arr as $v ) {	curl_get ( $v );}

img.txt保存的都是远程图片地址,如果在循环时sleep(2)可以全部正确保存到本地,不设置间隔时间,都会漏掉几张。有什么方法可以解决这个问题

你不用 curl_multi 的吗?单个 curl 无法充分利用资源
CURLOPT_FILE 参数可直接写入文件,而不需要人工干预

并不是一次性采集多张图片,然后发布到一篇文章。而是每篇文章中的远程图片都会保存到本地,所以用的是单线程的curl.

采集100篇带图片的文章到自己的程序,使图片本地化的过程中,就漏了一部分图片

你不用 curl_multi 的吗?单个 curl 无法充分利用资源
CURLOPT_FILE 参数可直接写入文件,而不需要人工干预



CURLOPT_FILE 速度确实快多了,但只是遗漏的文件少了,仍然避免不了遗漏

一篇文章只有一张图片吗?
漏掉的图片也可能是没有分析出来

一篇文章只有一张图片吗?
漏掉的图片也可能是没有分析出来

只要每次循环间隔2秒就一定能完整保存到本地,难道没办法等其完全执行完毕后再执行下一次循环吗

一篇文章只有一张图片吗?
漏掉的图片也可能是没有分析出来

我保存为图片后,同时执行了file_put_contents  把图片地址写入到文本文件中,图片地址的数量一个也没少,说明图片解析是没问题的,问题可能是写入需要一定的时间,而循环却不等其写入完成

我使用 fwrite($fp, file_get_contents($url)); 解决了问题。但是curl为什么就不行呢?难道他不等数据返回就继续往下了吗,如何设置curl才能正确全部获取

你的 curl_get 不可能被重入
只有前一次执行完之后才可能执行下一次
是否在循环中停顿一下根本就没有关系

那问题在哪里呢,用curl为什么会丢失文件,该如何设置

CURLOPT_TIMEOUT 设置cURL允许执行的最长秒数

CURLOPT_CONNECTTIMEOUT 在发起连接前等待的时间,如果设置为0,则无限等待。

这2个试下,应该能解决问题。如果不能,请检查代码其他部分,不一定是curl的问题

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