The key function for working with files in Python is the open() function.

The open() function takes two parameters; filename, and mode.

There are four different methods (modes) for opening a file:

In addition you can specify if the file should be handled as binary or text mode

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Given an array of elements, we have to delete an element from the array by using the unset() function.

Input : $arr = array(1, 2, 6, 7, 8, 9);
unset($arr[3]);
Output : Array
(
[0] => 1
[1] => 2
[2] => 6
[4] => 8
[5] => 9
)

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preg_replace( $pattern, $replacement, $subject);
Parameters:

$pattern: It contains the string we have to replace.
$replacement: It contains the string that will replace the existing string.
$subject: It contains the main string file where need to remove the string.
We have created a text file named as fruits.txt

mango
apple
papaya
guava
apple
grapes
mango
apple

This program deletes the entire word from the file.

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preg_replace( $pattern, $replacement, $subject);
Parameters:

$pattern: It contains the string we have to replace.
$replacement: It contains the string that will replace the existing string.
$subject: It contains the main string file where need to remove the string.
We have created a text file named as fruits.txt

mango
apple
papaya
guava
apple
grapes
mango
apple

This program deletes a specific content from the file using preg_replace() function.

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preg_replace( $pattern, $replacement, $subject);
Parameters:

$pattern: It contains the string we have to replace.
$replacement: It contains the string that will replace the existing string.
$subject: It contains the main string file where need to remove the string.
We have created a text file named as fruits.txt

mango
apple
papaya
guava
apple
grapes
mango
apple

This program removes all the strings from the given file.

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To delete a file in PHP, use the unlink function. Let’s go through an example to see how it works.

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The fread function allows you to read from a file. It’s similar to fwrite, but you need to provide the length in bytes you want to read.

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The fwrite Function.
First and foremost is the fwrite function, which allows you to write string contents to the file stream referenced by the file handle. Let’s go through the following example to understand how it works.

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In this section, we’ll see how to create and open a file.

When it comes to creating a file, it’s the fopen function which you’ll end up using most of the time. It may seem a bit confusing to use the fopen function to create a file. In fact, the fopen function does two things: it creates a file if it doesn’t exist and also opens it for reading or writing.

Let’s go through the following example to understand how it works.

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Openpyxl is a Python library for reading and writing Excel (with extension xlsx/xlsm/xltx/xltm) files. The openpyxl module allows Python program to read and modify Excel files.

For example, user might have to go through thousands of rows and pick out few handful information to make small changes based on some criteria. Using Openpyxl module, these tasks can be done very efficiently and easily.

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