strpos($tplpath,':') !== false
strpos($tplpath,':') !== “ ”
或strpos($tplpath,':') !== NULL
或strpos($tplpath,':') !== 0
上在是不是都是等价的
不等价！
strpos 函数，成功返回从0算起的偏移量，不成功返回 false
!== 不等于，比较时连同数据类型一起比较
strpos($tplpath,':') !== false 这是正确的
strpos($tplpath,':') !== “ ” strpos要么返回数值，要么返回逻辑假，不会返回字符类型，条件恒成立
strpos($tplpath,':') !== NULL 同上
strpos($tplpath,':') !== 0 含义变了，变成判断第一个字符是否为“:”
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