{if}個評估在一個字符串

Question

我是一個加標籤報告系統上工作，其中一個文本塊將存儲這樣的信息：

This is a line with a {TAG} . The {TAG} will be replaced with normal text via str_replace. 
{if 1==1} 
    I would like to be able to do if statements like this. 
{/if} 

所以{TAG}被替換很容易，但有辦法解析一個文本塊來處理if/else語句？

Answer 1

在純粹的PHP中，如果你使用heredoc語法，你將無法做到如果塊內的字符串。

如果您能夠接受連接字符串，您可以使用三元運算符是這樣的：

$myString = 
    "This is a line with a {TAG}. " . 
    "The {TAG} will be replaced with normal text via str_replace. " . 
    (1==1 ? "I would like to be able to do if statements like this." : "") . " " 
; 

希望有所幫助。