Can php modify file content?

php can modify the file content. Method: 1. Use the fopen() function to open the file, and use the fwrite() function to write data in the opened file to modify the file. 2. Directly use the file_put_contents() function to modify the file by clearing the file and adding data again or by adding data at the end of the file.

The operating environment of this tutorial: windows7 system, PHP version 7.1, DELL G3 computer

php can modify the file content. Here are several methods to introduce to you.

1. Use the fwrite() function

fwrite($handle, $string, $length)The function can write a string into the file. The fwrite() function can write the contents of $string to the file pointer $handle. If $length is specified, writing will stop when $length bytes have been written or $string has been written. If the function is successfully executed, the number of bytes written will be returned. If the function fails, FALSE will be returned.

Example 1: Clear the file and re-add data

Example 2: Add data at the end of the file

2. Use the file_put_contents() function

file_put_contents($filename,$data,$mode,$context)The function can write a string to a file and accepts two required parameters $filename (the file to be opened) and $data (the content to be inserted, which can be a string, one-dimensional array or resource type), two omissible parameters $mode and $context (the environment of the file handle).

Among them, the $mode parameter is used for how to open/write files (i.e. file mode). It has three values:

• ##FILE_USE_INCLUDE_PATH: Default value, used to overwrite the original There is data.

• FILE_APPEND: If file $filename already exists, append data instead of overwriting.

• LOCK_EX: Obtain an exclusive lock while writing.

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