Home Backend Development PHP Tutorial Common functions for reading local files in php

Common functions for reading local files in php

Nov 29, 2016 am 11:20 AM
php

Below we use .txt file as an example to introduce the function of PHP to read 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 for directly opening a local file. We have added comments where necessary.

Example code for directly opening 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);

                                                                                                   );

} }

echo $datademo;

?>

2. Use the file_get_contents() function to output the entire file in a string. If there is such a sentence in our xmlas.txt text file: Now Movies are becoming less and less passionate. If you want to have all the climax, please watch Japanese love action movies. Then the example code of our file_get_contents() function 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, 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, the code is as follows:

/**

*Use fopen to write files

*@param string $filename

*@param string $contents

*@return boolean

*/

function wirte($filename,&$contents)

{

$fp =fopen($filename,"wb");

if($fp)

{

flock($fp,LOCK_EX);//Lock the file at the same time, only one person can operate it

fwrite($fp, $contents);

flock($fp,LOCK_UN);//Save the data to unlock the file and save it

fclose($fp);//Open source code phpfensi.com

return true;

}else

{

  return false;

}

}

In this way, you can read and write files by using fopen and fwrite.

Note: To open a file, before opening the file, we need to know the path of the file, and Whether this file exists.

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

$root = $_SERVER["DOCUMENT_ROOT"];

Use the function file_exists() to Check whether the file exists, as follows:

If(!file_exists("$root/order.txt")){echo 'The file does not exist';}

This may be more reasonable and practical.

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