Home > Article > Backend Development > How to use the is_writable function in php
Usage of the is_writable function in php: [is_writable(file)]. The is_writable function is used to determine whether the file is writable. If the file exists and is writable, the function returns true, otherwise, the function returns false.
php The is_writable function is used to determine whether the file is writable. The syntax of the is_writable function is is_writable(file). The parameter file is required and refers to the file to be checked. .
(Recommended tutorial: php video tutorial)
How to use the php is_writable function?
Function: Determine whether the file is writable
Syntax:
is_writable(file)
Parameters:
file required. Specifies the documents to be checked.
Description:
Returns true if the file exists and is writable. The file parameter can be a directory name that allows writability checking.
php is_writable() function example
<?php $file = is_writable("./test.txt"); if($file == 1) { echo "该文件是可写的"; }else{ echo "该文件不可写"; } ?>
The above is the detailed content of How to use the is_writable function in php. For more information, please follow other related articles on the PHP Chinese website!