File Write in PHP:

 Different modes of file to operated on a file, you have to open a file with one of these modes.

Mode Description
‘r’ Open for reading only; place the file pointer at the
beginning of the file.
‘r+’ Open for reading and writing; place the file pointer at
the beginning of the file.
‘w’ Open for writing only; place the file pointer at the
beginning of the file and truncate the file to zero length.
If the file does not exist, attempt to create it.
‘w+’ Open for reading and writing; place the file pointer at
the beginning of the file and truncate the file to zero
length. If the file does not exist, attempt to create it.
‘a’

Open for writing only; place the file pointer at the end of
the file. If the file does not exist, attempt to create it.

‘a+’ Open for reading and writing; place the file pointer at
the end of the file. If the file does not exist, attempt to
create it.
‘x’ Create and open for writing only; place the file pointer at the
beginning of the file. If the file already exists, the
fopen() call will fail by returning FALSE and
generating an error of level E_WARNING. If
the file does not exist, attempt to create it. This is equivalent
to specifying O_EXCL|O_CREAT flags for the
underlying open(2) system call.
‘x+’ Create and open for reading and writing; otherwise it has the
same behavior as ‘x’.
‘c’ Open the file for writing only. If the file does not exist, it is
created. If it exists, it is neither truncated (as opposed to
‘w’), nor the call to this function fails (as is
the case with ‘x’). The file pointer is
positioned on the beginning of the file. This may be useful if it’s
desired to get an advisory lock (see flock())
before attempting to modify the file, as using
‘w’ could truncate the file before the lock
was obtained (if truncation is desired,
ftruncate() can be used after the lock is
requested).
‘c+’ Open the file for reading and writing; otherwise it has the same
behavior as ‘c’.
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