php is_writable function

is_writable() definition: The

function determines whether the specified file is writable.

Syntax:

is_writable($filename);

Parameter list:

Parameter	Description
filename	Required. Specifies the documents to be checked.

Example:

<code><span><span>class</span><span>test</span>{</span><span>public</span><span><span>function</span><span>hello</span><span>(<span>$filename</span>)</span>{</span><span>if</span>(is_writable(<span>$filename</span>)){
             <span>echo</span><span>"$filename is writeable"</span>;
         }<span>else</span>{
             <span>echo</span><span>"$filename is not writeable"</span>; 
         }
     }
 }

<span>$T</span>=<span>new</span> test();
<span>$T</span>->hello(<span>"F:file.txt"</span>);</code>

<code>  输出结果：

   F:<span>file</span>.txt <span>is</span> writeable </code>

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