How do i upgrade from PHP 4.1.2 to PHP 4.3.8 on RHL 7.3

I have an old linux box i found and have RH 7.3 on it (upgrading RH is not an option). I am running php 4.1.2 and want to go to 4.3.8. This machine just has webmin on it and no Cpanel or WHM...

Any ideas on the best way to upgrade...

 

 

 

 

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