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php 使用file_get_contents读取大文件的方法,
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php 使用file_get_contents读取大文件的方法,

Jun 13, 2016 am 09:21 AM
file get php

php 使用file_get_contents读取大文件的方法,

当我们遇到文本文件体积很大时,比如超过几十M甚至几百M几G的大文件,用记事本或者其它编辑器打开往往不能成功,因为他们都需要把文件内容全部放到内存里面,这时就会发生内存溢出而打开错误,遇到这种情况我们可以使用PHP的文件读取函数file_get_contents()进行分段读取。

函数说明
string file_get_contents ( string $filename [, bool $use_include_path [, resource $context [, int $offset [, int $maxlen ]]]] )
和 file() 一样,只除了 file_get_contents() 把文件读入一个字符串。将在参数 offset 所指定的位置开始读取长度为 maxlen 的内容。如果失败,file_get_contents() 将返回 FALSE。

file_get_contents() 函数是用来将文件的内容读入到一个字符串中的首选方法。如果操作系统支持还会使用内存映射技术来增强性能。

应用:

复制代码 代码如下:


$str = $content=file_get_contents("2.sql",FALSE,NULL,1024*1024,1024);
echo $str;

如果针对较小文件只是希望分段读取并以此读完可以使用fread()函数

复制代码 代码如下:


$fp=fopen('2.sql','r');
while (!feof($fp)){
$str.=fread($fp, filesize ($filename)/10);//每次读出文件10分之1
//进行处理
}

echo $str;

以上就是如何使用file_get_contents函数读取大文件的方法,超级简单吧,需要的小伙伴直接搬走!

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