Controlling a Stepper Motor Using a Photoresistor

[groundFungus]

@soyuzan

(60 < PR_value <= 70)

You cannot do comparisons like that. Each comparison must be separate.
Something like:
(PR_value > 60 && PR_value <= 70)

Same with the other, similar, if structures.

@soyuzan

&& (if_open = false))

= for assignment, == for comparison. See the warning in the if structure reference.

Beware of accidentally using the single equal sign (e.g. if (x = 10) ). The single equal sign is the assignment operator, and sets x to 10 (puts the value 10 into the variable x). Instead use the double equal sign (e.g. if (x == 10) ), which is the comparison operator, and tests whether x is equal to 10 or not. The latter statement is only true if x equals 10, but the former statement will always be true.

@soyuzan

if (irrecv.decode(&results)) //Infared Controller Code

; {

That extra semicolon may mess things up. Be careful with your syntax, an if structure should not end with a semicolon.

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