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Today, I would like to share with you how to achieve php file writing does not cover the relevant knowledge points, the content is detailed, logic is clear, I believe that most people still know too much about this knowledge, so share this article for your reference, I hope you can learn something after reading this article, let's take a look at it.

Method: 1, with "file_put_contents (file name, 'data', FILE_APPEND)"; 2, with "fwrite (file name,'a'), 'data')", fopen () can append mode to open the file, fwrite () can write data in the open file.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

How to realize File Writing without overwriting by php

In php, if you want to write a file without overwriting, you can do so by appending data to the end of the file.

PHP supports two ways to append data to the end of a file:

Use the file_put_contents () function

Using the fopen () and fwrite () functions

There is a text file called "test.txt" that contains:

Let's see how to write data to a file (not overwritten):

Method 1: append data using file_put_contents () function

The file_put_contents () function can write a string to a file in the following syntax format:

File_put_contents (string $filename, mixed $data [, int $flags = 0 [, resource $context]])

The parameters are described as follows:

Filename: the name of the file to be written to

$data: the data to be written, which can be a string, an one-dimensional array, or a resource

$flags: optional parameter, whose values can be the following (you can use a combination of | operators):

FILE_USE_INCLUDE_PATH: search the include directory for $filename.

FILE_APPEND: if the file $filename already exists, append the data instead of overwriting it.

LOCK_EX: acquire an exclusive lock when writing.

$context: optional parameter, a context resource.

Setting the third parameter of the file_put_contents () function to "FILE_APPEND" appends data instead of overwriting it.

Example:

Method 2: append data using fopen () and fwrite () functions

Key code analysis:

The fopen ($filename, $mode) function opens a file in the specified file mode $mode. When $mode is an or await, set the file pointer to the end of the file when opening the file; in this way, when writing, the data is appended to the existing data.

The fwrite () function can write a string to an open file, so the purpose of the fwrite ($handle, 'https://www.yisu.com/')) statement is to write the string "https://www.yisu.com/"" to the already opened "test.txt".

When the write is complete, use the fclose () function to close the file. If you want to get the new content in the "test.txt" file, use the readfile ($file) function to get it directly.

These are all the contents of the article "how to write a file without overwriting it in php". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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