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為什么一用for或者if標(biāo)簽就會(huì)報(bào)錯(cuò)

能用模板輸出數(shù)據(jù)，可是用for或者if的時(shí)候就會(huì)報(bào)錯(cuò)

:(

Call to undefined function simplexml_load_string() /var/www/html/ThinkPHP/Lib/Template/TagLib.class.php 第 84 行.

錯(cuò)誤位置

FILE: /var/www/html/ThinkPHP/Lib/Core/Think.class.php 　LINE: 275

TRACE

[16-10-13 09:53:10] /var/www/html/ThinkPHP/Lib/Core/Think.class.php (275) halt(Call to undefined function simplexml_load_string() /var/www/html/ThinkPHP/Lib/Template/TagLib.class.php 第 84 行.)
[16-10-13 09:53:10] /var/www/html/ThinkPHP/Lib/Core/Think.class.php (290) Think::appError(1, Call to undefined function simplexml_load_string(), /var/www/html/ThinkPHP/Lib/Template/TagLib.class.php, 84)
[16-10-13 09:53:10] ?() Think::fatalError()

ThinkPHP3.1.2 { Fast & Simple OOP PHP Framework } -- [ WE CAN DO IT JUST THINK ]