Difference in operator priority between PHP and JavaScript

: This article mainly introduces the differences in operator priorities between PHP and JavaScript. For more information about PHP tutorials, see. Most of the two have the same priority. comparision and assignment operations have slight differences. Comparison operators include >,<, >=, and so on. value assignment operators include =, + =, and * =.

In JS, the comparison operator has a higher priority than the value assignment operator. So foo = 1 <2 result foo = false;

In PHP, the value assignment operator has a higher priority than the comparison operator. So foo = 1 <2 result foo = 1, and the expression is false. Parentheses must be added to achieve the same result as above.

Foo = (1 <2)

Appendix: complete operator priority of PHP and JavaScript

JS

The following table is ordered from highest (19) to lowest (0) precedence.

Precedence	Operator type	Associativity	Inpidual operators
19	Grouping	N/	( … )
18	Member Access	Left-to-right	… . …
	Computed Member Access	Left-to-right	… [ … ]
	New (with argument list)	N/	new … ( … )
17	Function Call	Left-to-right	… ( … )
	New (without argument list)	Right-to-left	new …
16	Postfix Increment	N/	… ++
	Postfix Decrement	N/	… --
15	Logical NOT	Right-to-left	! …
	Bitwise NOT	Right-to-left	~ …
	Unary Plus	Right-to-left	+ …
	Unary Negation	Right-to-left	- …
	Prefix Increment	Right-to-left	++ …
	Prefix Decrement	Right-to-left	-- …
	Typeof	Right-to-left	typeof …
	Void	Right-to-left	void …
	Delete	Right-to-left	delete …
14	Exponentiation	Right-to-left	… ** …
	Multiplication	Left-to-right	… * …
	Division	Left-to-right	… / …
	Remainder	Left-to-right	… % …
13	Addition	Left-to-right	… + …
	Subtraction	Left-to-right	… - …
12	Bitwise Left Shift	Left-to-right	… << …
	Bitwise Right Shift	Left-to-right	… >> …
	Bitwise Unsigned Right Shift	Left-to-right	… >>> …
11	Less	Left-to-right	… < …
	Less Than Or Equal	Left-to-right	… <= …
	Greater	Left-to-right	… > …
	Greater Than Or Equal	Left-to-right	… >= …
	In	Left-to-right	… in …
	Instanceof	Left-to-right	… instanceof …
10	Equality	Left-to-right	… == …
	Inequality	Left-to-right	… != …
	Strict Equality	Left-to-right	… === …
	Strict Inequality	Left-to-right	… !== …
9	Bitwise AND	Left-to-right	… & …
8	Bitwise XOR	Left-to-right	… ^ …
7	Bitwise OR	Left-to-right	… | …
6	Logical AND	Left-to-right	… && …
5	Logical OR	Left-to-right	… || …
4	Conditional	Right-to-left	… ? … : …
3	Assignment	Right-to-left	… = …
			… += …
			… -= …
			… **= …
			… *= …
			… /= …
			… %= …
			… <<= …
			… >>= …
			… >>>= …
			… &= …
			… ^= …
			… |= …
2	Yield	Right-to-left	yield …
1	Spread	N/	......
0

PHP

Operator Precedence

Associativity	Operators	Additional Information
Non-associative	Clone new	Clone andnew
Left	[	Array ()
Right	**	Arithmetic
Right	++ --~ (Int) (float) (string) (array) (object) (bool )@	Types andincrement/decrement
Non-associative	Instanceof	Types
Right	!	Logical
Left	*/%	Arithmetic
Left	+ -.	Arithmetic andstring
Left	<>	Bitwise
Non-associative	<=> =	Comparison
Non-associative	=! ===! ==<><=>	Comparison
Left	&	Bitwise andreferences
Left	^	Bitwise
Left	|	Bitwise
Left	&&	Logical
Left	|	Logical
Right	??	Comparison
Left	? :	Ternary
Right	= + =-= * = ** =/=. = % = & = | = ^ = <= >>=>	Assignment
Left	And	Logical
Left	Xor	Logical
Left	Or	Logical

The above introduces the differences in the operator priorities between PHP and JavaScript, including the content, and hope to be helpful to friends who are interested in PHP tutorials.