为什么中间加判断语句的时候会输出意想不到的输出？

Question

test1.txt文件内容如下：this is my first day come in island.this is my first day come in island.this is my first day come in island.this is my first day come in island.我的PHP文件——filesystem.php文件内容如下：$file = fopen("test1.txt","r");echo "<br>";while(!feof($file)){ echo fgetc($file); if(fgetc($file)==""){ echo "<br>"; }}fclose($file);在浏览器的输出如下：ti sm is a oei sad ti sm is a oei sad ti sm is a oei sad ti sm is a oei sad 请问这是什么情况？

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Answer 1

PHP code?$root = $_SERVER['DOCUMENT_ROOT'];$file = fopen("$root/php_02/123.txt", "rb");while(!feof($file)){$char = fgetc($file);if(!feof($file)):echo $char == '\n'?'<br>':$char;endif;}fclose($file);书上说，fgetc函数会返回EOF，因此在循环内部用feof函数判断是否达到文件结束，如果到达就不回显在浏览器上。我就有个疑问，PHP code?$char = fgetc($file);