How PHP uses file_get_contents to read large files _php tips

When we encounter a large text file size, such as more than dozens of m or even hundreds of M several g of large files, with Notepad or other editors to open often can not succeed, because they all need to put the contents of the file in memory, then there will be memory overflow and open error, In this case we can use PHP's file read function file_get_contents () for segmented read.

Function description
String file_get_contents (String $filename [, bool $use _include_path [, Resource $context [, int $offset [, int $maxlen] ]]] )
As with file (), only file_get_contents () reads the file into a string. Reads the content of length MaxLen at the location specified by the parameter offset. If it fails, file_get_contents () returns FALSE.

The file_get_contents () function is the preferred method for reading the contents of a file into a string. Memory-mapping technology is also used to enhance performance if supported by the operating system.

Application:

Copy Code code as follows:

$str = $content =file_get_contents ("2.sql", false,null,1024*1024,1024);
Echo $str;

You can use the Fread () function if you want to read only segmented reads for smaller files

Copy Code code as follows:

$fp =fopen (' 2.sql ', ' R ');
while (!feof ($fp)) {
$str. =fread ($fp, FileSize ($filename)/10);/Read the file 10 per 1
For processing
}

Echo $str;

The above is how to use the File_get_contents function to read large files, super simple bar, the need for small partners to move directly!