PHP file read and write operation

First is a file to see whether can read (permission problem), or exist no, we can use the Is_readable function to get information.:
Php/func_filesystem_is_readable.htm ">is_readable function usage

The code is as follows	Copy Code
<?php $file = "Test.txt"; if (is_readable ($file)) { Echo ("$file is readable"); } Else { Echo ("$file is not readable"); } ?>

Output:

Test.txt is readable

The file_get_contents function is used to read files, which can read large amounts of data, or read remote server files, but must be php.ini start Allow_url_fopen = On otherwise this function is not available.

The code is as follows	Copy Code
<?php $file = "filelist.php"; if (file_exists ($file) = = False) { Die (' File not present '); } $data = file_get_contents ($file); echo htmlentities ($data); ?>

Read the remote file, this is the topic outside this tutorial.

The code is as follows	Copy Code
function Vita_get_url_content ($url) { if (function_exists (' file_get_contents ')) { $file _contents = file_get_contents ($url); } else { $ch = Curl_init (); $timeout = 5; curl_setopt ($ch, Curlopt_url, $url); curl_setopt ($ch, Curlopt_returntransfer, 1); curl_setopt ($ch, Curlopt_connecttimeout, $timeout); $file _contents = curl_exec ($ch); Curl_close ($ch); } return $file _contents; }

Using the Fread function
To read the file, this function can read the amount of data specified
Fread read a file instance

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$filename = "/www.111cn.net/local/something.txt"; $handle = fopen ($filename, "R"); $contents = Fread ($handle, FileSize ($filename)); Fclose ($handle);

Read the remote server content php5 the above version

The code is as follows	Copy Code
$handle = fopen ("http://www.111cn.net/", "RB"); $contents = Stream_get_contents ($handle); Fclose ($handle);

There is also a way to read binary files:

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$data = Implode ("", File ($file));

Write operations for fwrite files

Fwrite () writes the contents of a string to the file pointer files. If length is specified, when the length byte is written or a string is written, the write stops, depending on which case is first encountered.

Fwrite () returns the number of characters written and false when an error occurs.

File Write function:

code is as follows	copy code
<?php / /File Write function function php_write ($file _name, $data, $method = "W") { $filenum = @fopen ($file _name, $method); Flock ($ FILENUM,LOCK_EX); $file _data=fwrite ($filenum, $data); Fclose ($filenum); return $file _data; }