在已知结果的情况下，如何使用PHP和JS对三角函数的角度进行计算？

Question

目前在开发中遇到一个问题： 需要获取一个设备移动的角度。 
通过设备移动的时候可以获得一组数据：

{"ret":true,"batt":100,"temp":20,"gsensor":1,"x":8,"y":-2,"z":258}
{"ret":true,"batt":100,"temp":20,"gsensor":1,"x":8,"y":-2,"z":257}
{"ret":true,"batt":100,"temp":20,"gsensor":1,"x":6,"y":-3,"z":258}
{"ret":true,"batt":100,"temp":20,"gsensor":1,"x":10,"y":-3,"z":259}
{"ret":true,"batt":100,"temp":20,"gsensor":1,"x":7,"y":-4,"z":257}
{"ret":true,"batt":100,"temp":20,"gsensor":1,"x":-245,"y":35,"z":-10}
{"ret":true,"batt":100,"temp":20,"gsensor":1,"x":-244,"y":34,"z":-11}
{"ret":true,"batt":100,"temp":20,"gsensor":1,"x":-243,"y":34,"z":-12}
{"ret":true,"batt":100,"temp":20,"gsensor":1,"x":-244,"y":35,"z":-10}

其中gsensor的xyz三个数据可以通过设备得出。 
现在厂商提供给我们了几个公式：

其中，g是重力加速度。

如何使用JS或者PHP来根据获取到的x,y,z三个值来获取θ和ψ两个角度值？
或者如何根据公式最后一条来计算ψ? 使用JS或者PHP该如何实现？

Answer 1

php的asin方法js的asin方法