I want to change the value of a string

Question

I have a string that has value Grade 1.I want to change it to grade_1

here is my code.

         $gradeselection="Grade 1";          //it is getting value from a select box .this is just for understanding.

I have used preg_replace but not getting the solution.

Answer 1

Instead of preg_replace you can use str_replace
try this one

echo str_replace("Grade 1","grade_1",$gradeselection);