How to use related functions to read files in PHP_PHP tutorial

in

1. ?php
2. $file = 'dirlist.php';
3. if (is_readable($file)
   == false) {
4. die('File does not exist or cannot be read');
5. } else {
6. echo 'exists';
7. }
8. ?>

The function to determine the existence of a file also includes file_exists (demonstrated below), but this is obviously not as comprehensive as is_readable. When a file If it exists, you can use

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li>
<span>$</span><span class="attribute">file</span><span> = </span><span class="attribute-value">"filelist.php"</span><span>;  </span>
</li>
<li class="alt"><span>if (file_exists($file) == false) {  </span></li>
<li><span>die('文件不存在');  </span></li>
<li class="alt"><span>}  </span></li>
<li>
<span>$</span><span class="attribute">data</span><span> = </span><span class="attribute-value">file_get_contents</span><span>($file);  </span>
</li>
<li class="alt"><span>echo htmlentities($data);  </span></li>
<li>
<span class="tag">?></span><span> </span>
</li>
<li class="alt"><span> </span></li>
</ol>

. However, the file_get_contents function is not supported in lower versions. You can first create a handle to the file, and then use the pointer to read all :

$fso = fopen($cacheFile, 'r');
$data = fread($fso, filesize($cacheFile));
fclose($fso);

There is another way to read binary files:

$data = implode('', file($file));

http://www.bkjia.com/PHPjc/445974.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445974.htmlTechArticleat?php $ file = 'dirlist.php' ; if(is_readable($file) ==false){ die('The file does not exist or cannot be read'); }else{ echo 'exists'; }? The function to determine the existence of a file is also file_exists (below...