Common functions for reading local files in php (fopen and file_get_contents)_php basics

//Instance code to directly open a local file //Suppose our local file is a text named xmlas.txt
$filedemo = "xmlas.txt";
$fpdemo = fopen($filedemo,"r" );
if ($fpdemo){
while(!feof($fpdemo)){
//Number of characters read by 1000
$datademo = fread($fpdemo, 1000);                                                                   fclose($fpdemo);

2. Use the file_get_contents() function to output the entire file in a string:

Suppose there is such a sentence in our xmlas.txt text file: Current Movies There is less and less passion. If you want to have all the orgasms, please watch Japanese Love

Action movie!
Then the example code of our file_get_contents() function is as follows:

3. How to read a local folder instead of a separate file:
Please see the example code below. In the example we will read a folder named xmlas :

4. We can also use fopen to write files

In this way, I only need to use fopen and fwrite to read and write files.

Note: lOpen the file

Before opening the file, we need to know the path of the file and whether the file exists.

Use the $_SERVER["DOCUMENT_ROOT"] built-in global variable to obtain the relative path of the site. As follows:

Using the function file_exists() to detect whether the file exists. As follows:

This may be more reasonable and practical.