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PHP File Handling



PHP File Handling(file system)

The file system functions allow you to access and manipulate the file.

file system provides a concept to start a specific data using different types of file format.

That means file gives us linear type database concept.

There is no any type of relations will be found with value because it doesn't support RDBMS concept.

Through this concept you will retrieved data from disk files, XML documents and many other data sources.

Files In a computer, a file system (sometimes written filesystem) is the way in which files are named and where they are placed logically for storage and retrieval.

The DOS, Windows, OS/2, Macintosh, and UNIX-based operating systems all have file systems in which files are placed somewhere in a hierarchical (tree) structure.

A file is placed in a directory (folder in Windows) or sub-directory at the desired place in the tree structure.

How to Create a file using PHP

touch( ) function is used to create a file Syntax

<?php

touch("fileName with extension");

?>

Eg

<?php
	 
//create a ms word file

 touch("resume.doc");
	 
	 
//create text file
touch("data.txt");
	 
	 
//create pdf file
 touch('corephp.pdf');
 
?>

Output Check your folder manually (same folder where you have saved your program) a file will be created

How to Delete a file using PHP

unlink( ) function is used to delete a file Syntax

<?php
	  
unlink("fileName with extension");

?>

Eg

<?php

	 
//delete  resume word file
 unlink("resume.doc");
	 
//delete text file
unlink("data.txt");
	 
//delete pdf file
unlink('corephp.pdf');
 
?>

Output Check your folder manually (same folder where you have saved your program) a file will be deleted

How to copy a file using PHP

copy( ) function is used to copy file Syntax

<?php

 copy("source file with extension","destination fileName with same extension");

?>

Eg

<?php

//copy resume doc
 copy("resume.doc","Update resume.doc");
	 
//copy text file
 copy("data.txt","update data.txt");		 	

?>

Output Check your folder manually (same folder where you have saved your program) a file will be copied with new name

How to Rename file using PHP

rename( ) function is used to rename file. Syntax

<?php

rename("old fileName with extension","New fileName with same extension");

?>

Eg

<?php
	 
//rename resume doc
 rename("resume.doc","Update resume.doc");
	 
//rename text file
 rename("data.txt","update data.txt");		 	

?>

Output Check your folder manually (same folder where you have saved your program) a file will be renamed

Checks whether a file or directory exists

file_exists( ) function is used to check file or directory existence. Syntax

<?php

//check file existence
 file_exists("fileName with extension");
 
 // OR

//check directory extistence
 file_exists("directory name");

?>

Eg

<?php
	
//check file existence
echo file_exists("Update resume.doc");
	 		 	
?>

Output It returns true(1) if file exists otherwise return false(blank screen)

Check size of the file in PHP

filesize( ) function is used to check file size. Syntax

<?php
  
 filesize("fileName with extension");

?>

Eg

<?php	
	
//check file size
 echo filesize("Update resume.doc")." Bytes";	 	
 
?>

Output 0 Bytes

Check Path of the file in PHP

realpath( ) function is used to check real path of the file. Syntax

<?php

realpath("fileName with extension");

?>

Eg

<?php
	
//check real path of the file
echo realpath("Update resume.doc");
	 		 	
 ?>
Output C:xampplitehtdocsYoufProjectfileName with extension //OR C:wampwwwYoufProjectfileName with extension