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. .

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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";
}
?>

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