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Yes, a string can contain operator symbols, eg:

const char *s= "+*-/";

PHP Operators are syntactical constructs that assign, compare, or modify a value. There are bitwise operators, arithmetic operators, boolean operators, assignment operators, and concatenation operators. There are also a wide variety of functions and class methods which simulate or utilize these operations.

They can have operators. It depends on the formula or function in question. There are lots of kinds of operators that can be used like the mathematical ones, operators for comparisons and boolean operators.

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