PHP/operator

List

(very incomplete; mainly to document the more obscure ones)

operator	name	example	meaning	familiarity	docs
==	Equal	$a == $b	true if $a is equal to $b after type juggling.	common	Comparison Operators
===	Identical	$a === $b	true if $a is equal to $b, and they are of the same type.	common-ish	Comparison Operators
!=	Not equal	$a != $b	true if $a is not equal to $b after type juggling.	common	Comparison Operators
<>	Not equal	$a <> $b	true if $a is not equal to $b after type juggling.	common
!==	Not identical	$a !== $b	true if $a is not equal to $b, or they are not of the same type.	common
<	Less than	$a < $b	true if $a is strictly less than $b.	common
>	Greater than	$a > $b	true if $a is strictly greater than $b.	common
<=	Less than or equal to	$a <= $b	true if $a is less than or equal to $b.	common
>=	Greater than or equal to	$a >= $b	true if $a is greater than or equal to $b.	common
<=>	spaceship	$a <=> $b	An int less than, equal to, or greater than zero when $a is less than, equal to, or greater than $b, respectively.	common
?:	ternary	$A ? $B : $C	"if $A is true, then $B, else $C"	less common	2024-07-21 Currently testing to see if this can be used as an if/then replacement when there's no return value.
??	null coalescing	$A ?? $B	"$A if it isn't NULL, else $B"	rare
??=	null coalescing	$A ??= $B	"if $A is NULL, set it to $B" equivalent to $A = $A ?? $B	rare
instanceof	type comparison	$A instanceof $B	TRUE if $A is a class (or object of a class) that inherits from class $B	nonstandard	see inheritance

Docs

• Operators
  • Arithmetic Operators
  • Assignment Operators
  • Bitwise Operators
  • Comparison Operators
  • Error Control Operators: the @ operator
  • Execution Operators: the `` (backtick) operator
  • Incrementing/Decrementing Operators
  • Logical Operators
  • String Operators
  • Array Operators
  • Type Operators
• Operator Precedence: if it matters, use parentheses to make it unambiguous; precedence rules can change.