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

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

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Release： 2016-05-16 09:00:18

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Below we use .txt files as an example to introduce PHP's function of reading local files. To read files, we can use fopen or file_get_contents to read. File_get_contents is simpler, but fopen requires the cooperation of fread to display the read content.

1. First, let’s introduce the fopen() function

Below we give a code demo that directly opens a local file. We have added the necessary places. Annotated:

Copy code The code is as follows:

//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:

Copy code The code is as follows:

  echo file_get_contents("xmlas .txt"); 
 //The output content at this time is the content in xmlas.txt: 
 //Today’s movies are becoming less and less passionate. If you want to have all the climax, please watch Japanese love action movies! 
 ?> 

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 :

Copy code The code is as follows:

 $dirdemo = opendir('/xmlas'); 
 while(($filedemo = readdir($dirdemo))!= false){ 
 if ($filedemo!="." && $filedemo!="..") { 
 $nsdemo = explode('.', $filedemo); 
 echo $nsdemo[0 ]; 
 } } 
 } 
 closedir($dirdemo); 
 ?> 

4. We can also use fopen to write files

Copy code The code is as follows:

/**
 *Write with fopen File
 *@param string $filename
 *@param string $contents
 *@return boolean
 */

 function wirte($filename,&$contents)
 {
 $fp=fopen($filename,"wb");
 if($fp)
 {
 flock($fp,LOCK_EX);//Only one file can be locked at the same time Human operation
 fwrite($fp,$contents);
 flock($fp,LOCK_UN);//Save the data to unlock the file and save it
 fclose($fp);
 return true; 
 }else
 {
 return false;
 }
 }