PHP Operators
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Operator		Description					Operands				Association		Level 
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NEW 			Create new object 				Constructor call 			Right to left 		1 
. 			Property access (dot notation) 	Objects 									2 
[ ] 			Array index 					Array, integer, or string 					2 
() 			Function call 					Function or argument 						2 
! 			Logical NOT 					Unary 					Right to left 		3 
~ 			Bitwise NOT 					Unary 					Right to left 		3 
++, -- 			Inc and dec operators 				lvalue 					Right to left 		3 
+, - 			Unary plus, negation 				Number 					Right to left 		3 
(int) 			Cast operators 					Unary 					Right to left 		3 
(double) 		Cast operators 					Unary 					Right to left 		3 
(string) 		Cast operators 					Unary 					Right to left 		3 
(array) 		Cast operators 					Unary 					Right to left 		3 
(object) 		Cast operators 					Unary 					Right to left 		3 
@ 			Inhibit errors 					Unary 					Right to left 		3 
*, /, % 		Multiplication, division 			Numbers 							4 
+, - 			Addition, subtraction 				Numbers 							5 
. 			Concatenation 					Strings 							5 
<<, >> 			Bitwise shift left, right 			Binary 								6 
<, <=, >, >= 		Comparison operators 				Numbers, strings 						7 
==, != 			Equality, inequality 				Any 								8 
===, !== 		Identity, non-identity 				Any 								8 
& 			Bitwise AND 					Binary 								9 
^ 			Bitwise NOR 					Binary 								10 
| 			Bitwise OR 					Binary 								11 
&& 			Logical AND 					Boolean 							12 
|| 			Logical OR 					Boolean 							13 
? : 			Conditional 					Boolean 				Right to left 		14 
= 			Assignment 					lvalue=any 				Right to left 		15 
AND 			Logical AND 					Boolean 							16 
OR 			Logical OR 					Boolean 							17 
XOR 			Logical XOR 					Boolean 							18 



			Associativity Operators Additional Information
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non-associative 		new 									new
left 				[ 									array()
non-associative 		++ -- 									increment/decrement
non-associative 		~ - (int) (float) (string) (array) (object) @ 				types
non-associative 		instanceof 								types
right 				! 									logical
left 				* / % 									arithmetic
left 				+ - . 									arithmetic and string
left 				<< >> 									bitwise
non-associative 		< <= > >= 								comparison
non-associative 		== != === !== 								comparison
left 				& 									bitwise and references
left 				^ 									bitwise
left 				| 									bitwise
left 				&& 									logical
left 				|| 									logical
left 				? : 									ternary
right 				= += -= *= /= .= %= &= |= ^= <<= >>= 					assignment
left 				and 									logical
left 				xor 									logical
left 				or 									logical
left 				, 									many uses