5.
以直角坐标系的原点\(O\)为极点,\(x\)轴的非负半轴为极轴建立极坐标系,已知曲线\(C\)的极坐标方程为\(ρ\sin ^{2}θ=4\cos θ\).
\((1)\)求曲线\(C\)的直角坐标方程;
\((2)\)若直线\(l\)的参数方程为\( \begin{cases} x=1+ \dfrac {2 \sqrt {5}}{5}t \\ y=1+ \dfrac { \sqrt {5}}{5}t\end{cases}(t\)为参数\()\),设点\(P(1,1)\),直线\(l\)与曲线\(C\)相交于\(A\),\(B\)两点,求\(|PA|+|PB|\)的值.