Operator is used to make some operation on the operands eg +,- = etc. Mainly used operators in php is as of following types.
1 Arithmetic operator (eg +,-, * ,/ etc).
2 Comparison Operator(To compare values eg. < ,>, <=,>=, == , != etc.).
3 Increment/Decrement Operator (++ , — operates on single operand).
4 Logical operators (and ,or, xor(&& , ||, !) etc ).
5 Assignment Operator(used to store right value to left variable.).
6 String operators (. to concatenates the given strings).
7Array operators (+ union of the arrays, == checks if arrays are equals ,!= check arrays are not equals).