Writing and Appending to Files in PHP in Hindi | PHP Tutorial #37

Summary

In this informative tutorial, the presenter demonstrates the basics of file handling in PHP, including opening, writing, and appending to files. They introduce the concept of file pointers, akin to 'tokens' in a mall, essential for accessing and manipulating files. The video covers creating files in write mode, which overwrites existing content, and append mode, which adds data at the end. The presenter emphasizes the importance of closing files after use and encourages viewers to follow along with their PHP tutorial playlist for a comprehensive understanding of PHP file operations.

Takeaways

• 😀 The video discusses handling files in PHP, including creating and writing to them.
• 🔑 It emphasizes the importance of starting the Apache server for PHP file testing.
• 📝 The script demonstrates creating a new PHP file named '37files.php' to illustrate file operations.
• 📑 It explains how to write to a file in PHP using 'fopen' for opening a file and 'fwrite' for writing content.
• 🛒 The analogy of a 'token' in a mall is used to explain the concept of a file pointer in PHP.
• 📂 The video clarifies that opening a file in 'w' (write) mode will create the file if it doesn't exist or overwrite it if it does.
• 🔄 It shows that running 'fwrite' multiple times on an opened file in write mode will repeatedly overwrite the content.
• 📝 The script also covers appending to a file in PHP using 'a' mode, which adds content to the end of the file without overwriting existing data.
• 🔒 The importance of closing files with 'fclose' after operations is highlighted for good practice, even though PHP scripts close files automatically.
• 📚 The presenter encourages viewers to watch the PHP playlist from the start for a comprehensive understanding of PHP and web development basics.
• 👍 The video ends with an invitation for viewers to like the video, bookmark the playlist, and engage with the content.

Q & A

What is the purpose of the video script?

The purpose of the video script is to teach viewers how to handle file operations in PHP, specifically how to write to files using different modes.

How does the script suggest starting the Apache server for PHP file operations?

The script suggests starting the Apache server by accessing the PHP tutorial playlist and following along with the instructions provided there.

What is the analogy used in the script to explain the concept of a file pointer?

The script uses the analogy of a big mall where one needs to get a 'token' to access different services, similar to how a file pointer is used to access and manipulate files in PHP.

What is the significance of the 'w' mode in PHP file operations?

The 'w' mode in PHP file operations is significant because it opens a file for writing, and if the file does not exist, it is created. If it does exist, the content is overwritten.

How does the script demonstrate the creation of a new file in PHP?

The script demonstrates the creation of a new file by opening a file in 'w' mode, which automatically creates the file if it does not already exist.

What is the difference between writing to a file in 'w' mode and appending to a file in 'a' mode?

Writing to a file in 'w' mode overwrites any existing content in the file, while appending to a file in 'a' mode adds new content to the end of the existing file without erasing what's already there.

Why is it important to close a file after writing to it in PHP?

It is important to close a file after writing to it in PHP to ensure that the changes are saved and to free up system resources. It also prevents potential data corruption or loss.

What does the script suggest for maintaining good practice when working with files in PHP?

The script suggests using the 'fclose' function to close the file after writing or appending to it, as it is a good practice for maintainability and ensures that the file is properly closed after its operations are completed.

How does the script encourage viewers to learn PHP file operations effectively?

The script encourages viewers to learn by typing the code themselves, as it helps in better understanding and retention of the concepts.

What is the script's final recommendation for viewers who want to learn PHP thoroughly?

The script's final recommendation is for viewers to watch the PHP playlist from the start, as it covers the basics and progresses to more advanced topics, providing confidence through projects and exercises.

Outlines

00:00

📂 Introduction to Handling Files in PHP

In this segment, the instructor explains how to start an Apache server and introduces the process of creating and handling files in PHP. They create a new PHP file named '37files.php' and discuss reading and writing files. The analogy of a token system in a mall is used to explain file pointers. The instructor demonstrates how opening a file in write mode in PHP automatically creates it if it doesn't exist and highlights the functionality of 'fwrite' for writing to files.

05:02

✏️ Writing to a File in PHP

This paragraph continues the discussion on writing to files in PHP. The instructor explains that when a file is opened in write mode, its existing content is overwritten. They show how to use 'fwrite' to write content to a file multiple times and illustrate this by writing different content into 'myfile2.txt'. The process of closing files and the importance of using 'fclose' for maintainability are also covered.

10:03

📜 Appending to a File in PHP

The focus shifts to appending content to a file in PHP. The instructor demonstrates how to open a file in append mode using 'a' and explains that this mode adds content to the end of the file rather than overwriting it. The practical use of appending for creating log files is mentioned. The segment concludes with a comparison between write mode and append mode, emphasizing the overwrite nature of write mode.

📚 Conclusion and Further Learning

In the final paragraph, the instructor encourages viewers to access the PHP tutorial playlist from the beginning to gain a comprehensive understanding of PHP and web development basics. They stress the importance of practicing by typing out the code to solidify learning. The video wraps up with a call to action to like the video and bookmark the playlist for future reference. The instructor expresses gratitude to the viewers and signs off.

Keywords

💡PHP

PHP, which stands for Hypertext Preprocessor, is a widely-used open-source server-side scripting language that is especially suited for web development. In the video, PHP is the central theme as the script discusses how to handle files using PHP functions. It is exemplified when the speaker creates a '37files.php' file to demonstrate file operations.

💡Apache server

The Apache server is a widely used web server software that powers many websites on the internet. In the context of the video, the speaker mentions starting the Apache server to facilitate the execution of PHP scripts, indicating the server's role in serving web pages that include PHP code.

💡File pointer

A file pointer is a reference to a specific location in a file. In the video, the concept of a file pointer is likened to obtaining a 'token' at a mall, which is necessary to perform operations like reading or writing to a file in PHP. The file pointer is essential for file handling operations such as opening, reading, writing, and closing files.

💡Write mode

Write mode in PHP is a file opening mode used with the fopen() function, denoted by 'w'. It is explained in the video that when a file is opened in write mode, if it already exists, its contents are truncated (emptied), and if it does not exist, a new file is created. The video demonstrates how fwrite() is used in conjunction with write mode to overwrite the contents of 'myfile2.txt'.

💡Append mode

Append mode in PHP, indicated by 'a', is used to open a file for writing only at the end of the file without truncating it. The video script explains that when using append mode, new content is added to the end of the file without affecting the existing content, which is useful for creating log files where data is sequentially added.

💡fopen

fopen() is a PHP function used to open a file or a URL. In the video, the speaker uses fopen() to create a file pointer for file operations. The function is essential for file handling as it initiates the process of reading from or writing to a file, with the mode specified by the user (e.g., 'w' for write or 'a' for append).

💡fwrite

fwrite() is a PHP function for writing data to a file. The video demonstrates fwrite() being used to add content to a file that has been opened in write or append mode. The function is showcased as a way to repeatedly write new lines to a file, overwriting in write mode or appending in append mode.

💡fclose

fclose() is a PHP function used to close an open file pointer. Although the video mentions that PHP automatically closes files at the end of the script execution, it emphasizes the good practice of using fclose() to ensure files are properly closed after their operations are completed, which is important for maintainability.

💡Overwrite

Overwriting in the context of file handling refers to the process of replacing the existing content of a file with new content. The video explains that when a file is opened in write mode, its existing content is lost, and fwrite() will start writing from the beginning of the file, effectively overwriting the old data.

💡File handling

File handling in PHP encompasses a set of operations performed on files, such as opening, reading, writing, and closing. The video script is focused on demonstrating file handling techniques in PHP, specifically how to write to files using different modes and the implications of each operation on the file's content.

Highlights

Introduction to handling files in PHP and starting the Apache server.

Creating a new PHP file named '37files.php' for the tutorial.

Explanation of PHP syntax for writing to files.

Analogy of a file pointer to a token in a mall for accessing services.

Demonstration of file creation in write mode with 'myfile2'.

Explanation of how write mode in PHP overwrites existing files.

Using 'fopen', 'fwrite', and 'fclose' functions for file operations.

Illustration of file content overwriting with multiple 'fwrite' calls.

Clarification on the effect of write mode resetting file content to empty.

Introduction to 'append' mode for adding content to the end of a file.

Demonstration of appending text to an existing file without overwriting.

Emphasis on the importance of closing files with 'fclose' for maintainability.

Highlighting the difference between write mode and append mode in PHP file handling.

Encouragement to watch the PHP playlist from the start for a comprehensive understanding.

Offer of confidence building through projects and exercises in the PHP playlist.

Request for viewers to type the code themselves to enhance learning.

Invitation to like the video and follow the playlist for more tutorials.

Transcripts

Alright guys, so we have seen a lot of things.

We have seen the files, how to handle them in PHP.

I am starting my Apache server.

You can also start your Apache server here if you have not done it yet.

And here what I will do is open my PHP tutorial playlist.

Along with that, we come here and make a new file whose name we are going to keep.

Santisfiles.php

And here PHP is which we are going to name as 37files.php and here

php is

you can write it like this

and now

we are going to see how to write

the files in php, so this file

which I have made, 37files.php

you have to

access it from here

so this index file which I have bookmarked

you will get it here

open it, there is nothing in this file, if you want you can write welcome

to see if it is working or not

write files in php

oops, I have commented it by mistake

if i do it like this then echo has been created

now how to write files here

first of all how to read files

to read myfile.txt

i have made my file pointer

and it has to be made here

it is said that

suppose there is a big mall

I am giving a good analogy

it came in my mind

there is a big mall, you get food there

you get to watch movie there

so what you have to do first

in most of the cases, you have to

take the token first

the token is available there

movie ticket is there, food token is there if you have to take a token, that you are getting a token there for which you have to take a movie ticket

there is a token for food also, if you want to buy something

there is a token for that also, so take a token first

if you want to eat dosa, maggi, chowmein, whatever you want to eat

bring a token from the counter first

then he will give you the token, so this token

is like a file pointer, so

here I have copied my file pointer so here I have copied my file pointer

and here I

will make a file named myfile2

because myfile is this and here

I will write the mode, I will make it w

and once I have made the mode w

here I will show you one thing

oops I don't have to run this I have to run here. Let me show you something here. Oops, I don't have to run it. I have to run it from here.

Sorry, this is not a python program.

I have to run it here. See, as soon as I tried to open it,

it was automatically created.

It was not there. It was not there. It was automatically created.

As soon as you open any file in PHP

in write mode,

it will automatically be yours. you will open any file in PHP in write mode

it will automatically become yours

it will never be like myfile3

and if I run it

then you can see myfile3 is also created

if you make myfile10, it will become 10x10

the whole folder will be filled if you keep on

reloading it with different file names

now here we have myfile3.txt

let me do one thing

let me come back to myfile2

and let me rename myfile3 to delete

not rename delete

I have deleted this file

now what I want to do

I want to write

and as F read, F write

it is a very nice

and beautiful syntax of PHP, I call it a very beautiful language

so you use F write and

give the first argument, file pointer to it

and what will you give the second argument to it

give the second argument to it, whatever you want to write in it

so I want to write

this is the best file on this planet

please don't argue with me on

this one.

Ok.

So I will save it

if I put semicolon here

now this is only one line

I have turned on word wrap here

if you will turn off word wrap

then this scroll bar will come out so you can do that too but I will make tutorial on word wrap if you turn off word wrap, you will get a scroll bar

you can do that too

but while making tutorial

I will keep it on

I have reloaded it

and now my file

which was 2.txt

has content in it

so let's say I wrote this content

now if I reload it 10 times

I reloaded it 10 times

I reloaded it 10 times

and I want you to guess in the comment section

I don't want you to know it beforehand

I just want you to guess what will happen

if you tell me in the comment section I will show you the initial guess what will happen if you tell me in the comment

I will show you what will happen

so here

what will happen is

this write

will write this line only once

and you will think why it write once

I will tell you the funda

why it write once

and I will close all these files

so I will close others first and then open myfile2.txt

so what happens when you open any file in write mode

then if it doesn't exist then it will be made

if it exists then whatever content you put in it will be overwrite

literally overwrite, you will lose all that content

ok

so here 37 files.php

I will run

this file once

so what will happen, this content will come in my file 2

if I

write here again

this is

another content

and again you have to close the file

you have to do it, you have to do it, you have to do it

and anyway, I sometimes

run it like python or notejs

but here it is saying close, ok I have to give the file pointer

also

it has to run with magic, it will know which file to close

maybe I have opened 10 files are open

now if I replicate it

I will show you a very interesting thing

and here I will write

this is another content

so what happens is

once you open the file

then if it is present

then it becomes empty in write mode

and after that if you run fwrite

10 times then it will be empty in write mode and if you run fwrite 10 times

then it will write it again and again

in the file, like if I show you

and now I show you the file

so see it has put all the things in it

it has put this is another content also

so what will happen if I comment out both of them

and now run this file

so see this file is empty

means when you will open it in write mode

at that moment it will be empty

if it exists then it will be

and after that whatever fwrite you will run

the content will come coming, coming, coming

so if I put a third

fptr, this is

another content 3 and I

backslash n here so that

clarity will be made, what are we doing

what content

are we writing, reload it

in my file 2

the more I fwrite it

what will happen

you can see

it will keep happening

we will keep writing in this

so what I did

as soon as I opened a file in write mode

what I got

it will make the file empty

if it exists and if it doesn't exist

then it will be created after that, how many times I will write

fwrite, till then this content

will keep writing in the file, so this is the writing

to a file, okay, so

I will do one thing

I will write it here

writing to a file in php

I will write

and now what I will do here

it will close here

now I will write here

appending to a file in PHP

now see we have made a very nice file

it has so much content

suppose you want to make a log file type

where you want to do something like

that your file

content will be added at the end of it

whatever you want to do

so in this what you will do

you will open it in append mode

and for append you have to write a

a means append

your file will open in append mode

I saved it

and see what is the content in this file

and in append mode

if I run fwrite

then what will happen, see for yourself

at the end of this

this is being

appended to the file

and by the way, there don't need to use fclose

because when your php script is finished, it will work

but it's a good practice to use fclose

so that if you want to do something later, your file is closed here

so it's very good to use fclose from the maintainability perspective

I will run it once and see what is the content of the file

this is being appended to the file

it is written here

I will run it once more

see this is being appended to the file

it is again written here

I will run it once more

see this is being appended to a file

so what is the meaning of append

it means to add it at the end

so by appending it means to connect at the end.

So by appending it will connect at the end.

So I hope you understood how it connects at the end.

But in write mode

remember that your file gets overwritten.

So whatever data is there

you lose it. So in write mode

it overwritesrites you should understand this

I hope you understood this

alright guys, if you haven't accessed my

php playlist yet, kindly do it

and if you will watch this playlist from the start

then you will benefit

it will take some time because I have started it from basic

even I have told you the basics of web development 101

so it will take some time to complete it

but if you complete it

then I will give you confidence through projects and exercises

that you will never get stuck in PHP

in your life. So guys

this was our PHP file reading

and writing. You must have understood

the difference between write mode and append mode

you will get all the source code

but still

I request you

to type it yourself. If you type

you will learn a lot.

So guys if if you haven't

liked this video yet, then do like it.

And click on the playlist above and click on the bookmark

and click below to save it. That's all for this video.

Thank you so much guys for watching this video.

And I will see you next time