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How to read files using feof() function in PHP

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Oct 28, 2016 pm 03:03 PM

This article mainly introduces the method of using the feof() function to read files in PHP, compares the correct and incorrect usage in the form of examples, and explains the usage skills of the feof() function. Friends in need can refer to it

The example in this article describes how PHP uses the feof() function to read files. Share it with everyone for your reference. The specific usage is as follows:
feof is applied to PHP 4, PHP 5
-used to test whether the file pointer has reached the end of the file.
If the server does not close the connection opened by fsockopen(), feof() will wait until timeout and return TRUE. The default timeout limit is 60 seconds, this value can be changed using stream_set_timeout().
The file pointer must be valid and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()).

If the passed file pointer is invalid, it may fall into an infinite loop, because EOF will not return TRUE.
Example #1 feof() using invalid file pointer Example:

<?<span style="color: #000000">php
</span><span style="color: #008000">//</span><span style="color: #008000"> 如果文件不可讀取或者不存在，fopen 函數(shù)返回 FALSE</span>
<span style="color: #800080">$file</span> = @<span style="color: #008080">fopen</span>("http://www.manongjc.com/article/1329.html", "r"<span style="color: #000000">);
</span><span style="color: #008000">//</span><span style="color: #008000"> 來自 fopen 的 FALSE 會發(fā)出一條警告信息并在這里陷入無限循環(huán). </span>
<span style="color: #0000ff">while</span> (!<span style="color: #008080">feof</span>(<span style="color: #800080">$file</span><span style="color: #000000">)) {
}
</span><span style="color: #008080">fclose</span>(<span style="color: #800080">$file</span><span style="color: #000000">);
</span>?>

Example:

<?<span style="color: #000000">php 
</span><span style="color: #800080">$file</span> = <span style="color: #008080">fopen</span>(<span style="color: #800080">$_SERVER</span>['DOCUMENT_ROOT']."/me/test.txt", "r"<span style="color: #000000">); 
</span><span style="color: #008000">//</span><span style="color: #008000"> http://www.manongjc.com/article/1328.html
//輸出文本中所有的行，直到文件結(jié)束為止。 </span>
<span style="color: #0000ff">while</span>(! <span style="color: #008080">feof</span>(<span style="color: #800080">$file</span><span style="color: #000000">)) 
{ 
</span><span style="color: #0000ff">echo</span> <span style="color: #008080">fgets</span>(<span style="color: #800080">$file</span>). "<br />"<span style="color: #000000">; 
} 
</span><span style="color: #008080">fclose</span>(<span style="color: #800080">$file</span><span style="color: #000000">); 
</span>?>

Output:
Hello, this is a test file.
There are three lines here.
This is the last line.

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