PHP provide us various operator. 
These are: 
1.Arithmetic Operator 
2.Assignment Operator 
3.Comparison Operator 
4.logical Operator 

1.Arithmetic Operator:Some arithmetic operators are given below:
Addition(\'+\') m+4 , 8(given m=4)
Subtraction(\'-\') m-4, 4(given m=8) 
Multiplication(\'*\') m*4, 8(given m=2) 
Division(\'/\') m/4, 2(given m=8) 
Modulus (division remainder)(\'%\') m%2, 1(given m=3) 
Increment(\'++\') m++, m=5(given m=4) 
Decrement(\'--\') m--, m=6(given m=5) 

2.Assignment Operator: Some assignment operations are given below:
 =    m=n    -=   m-=n or m=m-n  *=   m*=n or m=m*n/=   m/=n or m=m/n.=   m.=n or m=m.n%=   m%=n or m=m%n+=   m+=n or m=m+n 

3.Comparison Operator:Some comparison operators are given below:
==(is equal to)               2==5returns false 
!=(is not equal to)           2!==5returns true 
>(is greater than)            2==5returns false
<(is less than)               2==5returns true
>=(greater than or equal to)  2==5returns false 
<=(is less than or equal to)  2==5returns true 

4.Logical Operators:Some logic operators are given below:
&&(and)  (m<4 && n>2)returns true(given m=3,n=5) 
||(or)   (m=4 && n=4)returns false(given m=5,n=6) 
!(not)   !(m==n)returns true(given m=2,n=3)