变量类型_PHP
PHP支持如下的变量类型：
integer ：整数
double ：双精度数
string ：字符串
array ：队列数组
object ：对象
pdfdoc (only if enabled PDF support) ：PDF文本（仅仅在起用PDF支持之后生效）
pdfinfo (only if enabled PDF support) ：PDF信息（仅仅在起用PDF支持之后生效）
这些变量的类型通常不由程序员来设置；特别的，它在运行时由PHP依据上下文来设置使用什么类型。
如果您喜欢强制将某个变量转换到指定的类型，您还可以对该变量进行“cast”操作，或者使用函数“settype（）”。
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