Differences in operator precedence between PHP and JavaScript

The two priorities are the same, and the comparison (comparision) and Assignment (Assignment) operations are slightly different. The comparison operator has a, <, >=, and so on, the assignment operator has =, + =, *=, and so on.

The comparison operator in JS has a higher precedence than the assignment operator. So foo = 1 < 2 result Foo = false;

In PHP, in turn, the assignment operator takes precedence over the comparison operator. So foo = 1 < 2 result foo = 1, the expression is false. To achieve the same result as above, enclose the parentheses

Foo = (1 < 2)

Attached: full operator precedence for PHP and JavaScript

Js

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

Precedence	Operator Type	associativity	Individual Operators
19	Grouping	N/A	( … )
18	Member Access	Left-to-right	… . …
	Computed Member Access	Left-to-right	… [ … ]
	New (with argument list)	N/A	new … ( … )
17	Function Call	Left-to-right	… ( … )
	New (without argument list)	Right-to-left	new …
16	Postfix Increment	N/A	… ++
	Postfix Decrement	N/A	… --
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 Than	Left-to-right	… < …
	Less Than Or Equal	Left-to-right	… <= …
	Greater Than	Left-to-right	… > …
	Greater Than Or Equal	Left-to-right	… >= …
	Inch	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/A	......
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 describes the PHP and JavaScript operator precedence differences, including aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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