patch php generator

[AxiosLeo]

1. Supported set default clientName.
2. Discard strongly typed types in PHP code.
3. Fix the problem code of exception.

[codecov-commenter]

Codecov Report

Merging #16 into master will increase coverage by 0.07%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   95.21%   95.29%   +0.07%     
==========================================
  Files          15       15              
  Lines        2049     2041       -8     
==========================================
- Hits         1951     1945       -6     
+ Misses         98       96       -2     

Impacted Files	Coverage Δ
src/langs/php/config.js	100.00% <ø> (ø)
src/generator.js	91.48% <66.66%> (+0.37%)	⬆️
src/langs/php/combinator.js	91.22% <87.50%> (+0.13%)	⬆️

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