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 $C"	less common
??	null coalescing	`$A ?? $B`	"$A if it isn't NULL, else $B"	rare
instanceof	type comparison	`$A instanceof $B`	TRUE if $A is a class (or object of a class) that inherits from class $B	nonstandard	see inheritance