PHP Operators: Operator Priority Step By Step Tutorial

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PHP Operators: Operator Priority

Tag: operator, Operator Priority Category: PHP Basic
post: 08 Mar 2008 read: 1,187

PHP Operators Step By Step Tutorial - Part 15: For the complex expression which entangled of many operator and operand, the operators will be done by PHP according to its priority.

Example:


x = 24 - 20 / 4

For that, 24/4 will be done first, then the result of the division will become the reduction of 24 so that yields 19 non 1. That thing is caused by the priority of operator/higher than operator -.

The table of operator priority:

Priority	Operators	Workmanship sequence
1	new	non-associative
2	[	right
3	! ~ ++ -- (int) (float) (string) (array) (object) @	right
4	* / %	left
5	+ - .	left
6	<< >>	left
7	< <= > >=	non-associative
8	== != === !==	non-associative
9	&	left
10	^	left
11	\|	left
12	&&	left
13	\|\|	left
14	?:	left
15	= += -= *= /= .= %= &= \|=^= <<= >>=	left
16	print	right
17	and	left
18	xor	left
19	or	left
20	,	left

Operator in the same line have the same priority. Pay attention to the example of using string operator at script as following:

File name: operatorpriority.php


<html>
<head>
<title>Operator Priority</title>
</head>

<body>
<pre>
$a = 25;
$b = 10;
$c = 15;
$result = $a + $b * $c / 3;
</pre>
<h3>Processed by PHP</h3>
<?
$a = 25;
$b = 10;
$c = 15;
$result = $a + $b * $c / 3;
echo ("Result = $result");
?>
</body>
</html>

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PHP Operators: Operator Priority