is_writable
判断给定的文件名是否可写
简体中文
简体中文
<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$file</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"test.txt"</span><span class="token punctuation">;</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token function">is_writable</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">echo</span> <span class="token punctuation">(</span><span class="token string double-quoted-string">"<span class="token interpolation"><span class="token variable">$file</span></span> is writeable"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">else</span>
<span class="token punctuation">{</span>
<span class="token keyword">echo</span> <span class="token punctuation">(</span><span class="token string double-quoted-string">"<span class="token interpolation"><span class="token variable">$file</span></span> is not writeable"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token delimiter important">?></span></span>
输出：
test.txt is writeable
tmpfile
filesize
delete
fscanf
parse_ini_string
basename
chgrp
realpath_cache_get
