PHP file operations, multiline sentence reading, file () function, file_get_contents () function, file_put_contents () function, is_file, statistics of website pv (traffic volume), file copy, rename the file, delete the file unlink,

PHP file operations, multiline sentence reading, file () function, file_get_contents () function, file_put_contents () function, is_file, statistics of website pv (traffic volume), file copy, rename the file, delete the file unlink,

Add UTF-8 to php:

1 header ("Content-type: text/html; charset = 'utf-8 '");

File Operation steps:

1. Create a file.txt folder under the same directory

2. open the file

1 $ res = fopen ("file.txt", "r"); // open the file path, which is a resource and needs further processing; // r indicates read-only.

3. Read files

$ Str = fread ($ res, 300); // The second parameter is the read length (3 for each Chinese character) $ str = fread ($ res, filesize ("file.txt"); // filesize: Read the file size. // select echo $ str for either of the preceding two values;

4. close the file

Fclose ($ res); // after reading, close the resource

Reading multiple sentences:

1. Set the text to read/write and write multiple lines of text.

2. Read one or multiple rows

1 // open the file
2 $ res2 = fopen ("file.txt", "r"); 3 $ str2 = fgets ($ res2 ); // Line 4 echo $ str2. "<br>"; // line feed 5 $ str2 = fgets ($ res2); 6 echo $ str2; // The second line appears here
7 // use the while loop to display all of them (as shown below)
8 while ($ str2 = fgets ($ res2 )){
9 echo $ str2. "<br> ";
10}
11 // close the file
12 fclose ($ res2 );

The file () function reads a file into an array, and each element is separated by a line break:

1 $arr = file("file.txt");2 print_r($arr);3 echo "<table border = 1>";4 for($i = 0;$i < count($arr);$i++) {5     echo"<tr><td>".$arr[$i]."</td></tr>";6 }7 echo "</table>";

The file_get_contents () function reads the file content to a string (cross-origin reading is supported ):

1 $ str4 = file_get_contents ("http://www.jd.com"); // cross-domain 2 echo $ str4;

* ** The file_put_contents () function writes a string to a file, just like calling the fopen (), fwrite (), and fclose () functions in turn;

1 $ bol = file_put_contents ("file.txt", "I love you"); // You can overwrite the previous content with 2 echo $ bol;

* ** Is_file: determines whether a file exists.

1 $ bol = is_file ("file3.txt"); // check whether there is 2 echo $ bol in file3.txt;

Use the preceding annotation (***) to calculate the website pv (Traffic Volume ):

1 // first determine whether there is any statistical file 2 if (is_file ("pv.txt ")) {// 3 // get the value 4 $ res = file_get_contents ("pv.txt") in the file; 5 // accumulate 6 $ res + = 1; 7 // the added value of the class is stored in 8 file_put_contents ("pv.txt", $ res); 9 // output pv count 10 echo file_get_contents ("pv.txt "); 11} else {// file 12 without statistics // create a file and give the file an initial value of 13 file_put_contents ("pv.txt", 1 ); 14 // output the current pv: 115 echo file_get_contents ("pv.txt"); 16}

Copy

 copy("pv.txt","pv2.txt");

Rename a file

rename("pv2.txt","pv5.txt");

Delete file unlink

 unlink("pv5.txt");