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PHP include任意文件或URL介绍_php实例

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Release： 2016-06-07 17:20:19
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实践出真理，写一个简单文件PHP文件include一个js文件，执行后没有报错或警告信息，同时看到被包含js的文件的内容被打印出来。因此得出结论：include 目标文件可以是任意类型。

现在再回头看include的官方文档，其中有这么一段话：“当一个文件被包含时，语法解析器在目标文件的开头脱离 PHP 模式并进入 HTML 模式，到文件结尾处恢复。由于此原因，目标文件中需要作为 PHP 代码执行的任何代码都必须被包括在有效的 PHP 起始和结束标记之中。” 注意其中提到“HTML模式，PHP代码必须包括在有效的PHP标记符中”，仔细体会其含义，它其实隐式的说明了include可以是任意类型的文件。

另外在4.3.0以后，include 目标文件还可以是一个url，当然前提是需要在配置中设置 allow_url_include 为 on。

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