onlyone
onlyone-
That leaves onlyone viable alternative : to envision a path forward .
所以我们只有一个选择：想象出一条前进的道路。
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Notice the static $ onlyOne variable .
请注意这个静态的$onlyOne变量。
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The static modifier that precedes $ onlyOne ties the variable to the class itself .
$onlyOne之前的静态修饰符将此变量关系到类本身。
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The $ onlyOne variable is said to be a class attribute , as it is scoped to the class .
$onlyOne变量是一个类属性，因为其作用域是这个类。