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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');
?>
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');
?>
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");
?>
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");
?>
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");
?>
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";
?>
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");
?>