如何解決解析html代碼時收到的PHP語法錯誤？

Question

試圖打印出一些html表單，但我得到了解析語法錯誤。我相信它卡在SERVER [PHP_SELF]上，但我不確定。我怎樣才能讓它正確回顯？在服務器[PHP_SELF]線發生

錯誤

解析錯誤：語法錯誤，意想不到的T_ENCAPSED_AND_WHITESPACE，期待T_STRING或T_VARIABLE或T_NUM_STRING

function drawbuttons() 
{ 

echo <<<EOT 
<table> 
<tr><td> 
<form action="<?=$_SERVER['PHP_SELF'];?>" method="post"> 
<input type="submit" name="previous" value="Previous" STYLE="font-size:12pt; background-color:00BFFF; color:ffffff">"; 
</form> 
</td> 
<td> 
<form action="<?=$_SERVER['PHP_SELF'];?>" method="post"> 
<input type="submit" name="next" value="Next"STYLE="font-size:12pt; background-color:00BFFF; color:ffffff"> 
</form> 
</td></tr> 
</table> 
EOT; 
} 

Answer 1

從手冊上的heredoc syntax：

Heredoc text behaves just like a double-quoted string, without the double quotes. This means that quotes in a heredoc do not need to be escaped, but the escape codes listed above can still be used. Variables are expanded, but the same care must be taken when expressing complex variables inside a heredoc as with strings.

這意味着你不能使用PHP打開或關閉標籤，你需要使用的變量正確的語法。在這種情況下，請使用curly brace syntax：

echo <<<EOT 
<table> 
<tr><td> 
<form action="{$_SERVER['PHP_SELF']}" method="post"> 
<input type="submit" name="previous" value="Previous" STYLE="font-size:12pt; background-color:00BFFF; color:ffffff">"; 
</form> 
</td> 
<td> 
<form action="{$_SERVER['PHP_SELF']}" method="post"> 
<input type="submit" name="next" value="Next"STYLE="font-size:12pt; background-color:00BFFF; color:ffffff"> 
</form> 
</td></tr> 
</table> 
EOT; 

Answer 2

不能使用PHP開始標籤（或短不）在heredocs裏面。

使用，而不是：

<form action="{$_SERVER['PHP_SELF']}" method="post">