php operator precedence - Brave Search

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Operator Precedence in PHP | Learn How Operator Precedence Work?

March 31, 2023 - The PHP Operator Precedence actually specifies how two expressions are tightly bound together and evaluate first. Operator Precedence is also decided when and how the operators are grouped using different parenthesis types.

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php.net › manual › en › language.operators.precedence.php

PHP: Operator Precedence - Manual

The precedence of an operator specifies how "tightly" it binds two expressions together. For example, in the expression 1 + 5 * 3, the answer is 16 and not 18 because the multiplication ("*") operator has a higher precedence than the addition ...

Discussions

When should we use the php low precedence "or" operator instead of || operator?

To answer the question in the title: Never. More on reddit.com

r/PHP

17

17

May 20, 2016

Operator precedence in php - Stack Overflow

Operators don't only have a precedence, they also have an associativity, and ! is right associative, whereas = is left associative ... Not sure I understand the question, what do you mean by "how to execute the following ..."? - The logic is fine enough, the if condition is: if $a is NOT true, then enter ... Quote from the PHP ... More on stackoverflow.com

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php - Operator precedence: multiple expressions with && and || - Stack Overflow

I encountered a code line that looks like this: if ($users == 'all' || $_POST['user'] == 1 && $users == 'admins' || $_POST[ 'user' ] == 0 && $users == 'mods') ... I don't understan... More on stackoverflow.com

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Precedence of cast operators in php - Stack Overflow

First, you've got in line 3 the ...-juggling.php#language.types.typecasting), than the 6th line (arithmetic operators). ... Sign up to request clarification or add additional context in comments. ... Save this answer. Show activity on this post. According to the table you linked to, type casting has higher precedence (row 3) than ... More on stackoverflow.com

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gchamirpur.org › pdf › lectures5 › Lecture-7-PHP-Operator-Precedence-Associativity-.pdf pdf

7 PHP Operator Precedence and Associativity

PHP Operator Precedence and Associativity · The precedence of an operator specifies how tightly it binds two expressions · together. e.g. in the expression 1 + 5 * 3, the answer is 16 and not 18, because the · multiplication (*) operator has a higher precedence than the addition (+) operator.

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Understanding the PHP Operator Precedence - FlatCoding

April 15, 2025 - The PHP operator precedence refers to the high priority for two expression together, for example 5 + 6 * 2 the answer is 17 an not 22 the high precedence for the multiplication.

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PHP Operator Precedence - Which Operators Come First?

September 2, 2022 - PHP Operator precedence just looks at which operation will be performed first. You’ve seen operator precedence in mathematics. The multiplication and division operators are executed before the addition and subtraction operators.

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php tutorials: operator precedence

Here's a list of the operators you've met so far, and the order of precedence. This can make a difference, as we saw during the mathematical operators. Don't worry about these too much, unless you're convinced that your math or logical is correct. In which case, you might have to consult the following: The only operators you haven't yet met on the list above are the ... In recent editions of PHP, two new operators have been introduced: the triple equals sign ( = = =) and an exclamation, double equals ( != =).

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condor.depaul.edu › sjost › hci430 › documents › op-preced.htm

PHP Operator Precedence Table

Precedence Operator(s) 1 new 2 [ 3 ! - ++ -- (int) (float) (string) (boolean) (array) (object) 4 * / % 5 + - . 6 < <= > >= 7 == != === !== 8 && 9 || 10 ? : 11 = += -= *= /= .= %= 12 print 13 and 14 xor 15 or 16 ,

hellotech633.wordpress.com › 2017 › 11 › 19 › php-operator-precedence

PHP Operator precedence | hellotech

November 19, 2017 - The following table lists the operators in order of precedence, with the highest-precedence ones at the top. Operators on the same line have equal precedence, in which case associativity decides grouping. N.B:Below table taken from php official documentation.

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Understanding Precedence and Associativity | PHP Crash Course | InformIT

In general, operators have a set precedence, or order, in which they are evaluated. Operators also have associativity, which is the order in which operators of the same precedence are evaluated.

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reddit.com › r/php › when should we use the php low precedence "or" operator instead of || operator?

r/PHP on Reddit: When should we use the php low precedence "or" operator instead of || operator?

May 20, 2016 -

The book says that in below case, we can only use the or operator and not || operator, but I don't understand why:

mysql_select_db($database)  or  die("Unable to select database");

Can someone please explain why you can't use || in above example?

To answer the question in the title: Never.

In this case, it doesn't matter. What makes ||, or, &&, and tricky is that the assignment operator has higher precedence than 'and' and 'or', but lower precedence than || and &&: $a = false or true; // $a is false because = was done before 'or' $a = false || true; // $a is true because || was done before = To answer your direct question, I don't know of a case offhand where you'd specifically want to use and/or. I actually kind of hate this, because I prefer the aesthetics of the words over the symbols, personally.

tutorialspoint.com › php-operator-precedence

PHP Operator Precedence

September 19, 2020 - In that case, the order of associativity (either left or right) decides the order of operations. Operators of same precedence level but are non-associativem cannot be used next to each other. Following table lists PHP operators with decreasing order of precedence

stackoverflow.com › questions › 35792679 › operator-precedence-in-php

Operator precedence in php - Stack Overflow

This is an assignment, not a comparison. Besides, you have a function call which is needed to the assignment. Then the order is:

1) Function call returning false;
2) Assignment of false value to $a;
3) Negation of $a as !false, i.e., true.

webreference.com › php › basics › operators

Intro to PHP Operators

Before diving into specific operators, it's crucial to understand how PHP evaluates expressions with multiple operators. Operator precedence determines which operations are performed first, while associativity determines the order when operators have the same precedence.

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Operator Precedence | PHP | Tutorialink.com

Operator precedence determines the grouping of terms in an expression and decides how an expression is evaluated. Certain operators have higher precedence than others; for example, the multiplication operator has a higher precedence than the ...

php-dictionary.readthedocs.io › en › latest › dictionary › operator-precedence.ini.html

Operator Precedence — PHP Dictionary 1.0.0 documentation

January 20, 2026 - The operator precedence dictates in which order the operators in a same sequence are executed. For example, in the code 1 + 2 * 3, the order is the mathematical order : multiplication has precedence over addition. The results is 7, not 9. In PHP, operators have different precedence : .

stackoverflow.com › questions › 8138269 › operator-precedence-multiple-expressions-with-and

php - Operator precedence: multiple expressions with && and || - Stack Overflow

&& depends of the evaluation of the right expression when left one is true, || doesn't. You could rewrite it to:

if(
    $users == 'all' ||
    ($_POST['user'] == 1 && $users == 'admins') ||
    ($_POST['user'] == 0 && $users == 'mods')
)

And it'll be the same.

With no parenthesis, PHP will evaluate each expression from left to right, using PHP's operator precedence along the way. However, as in any logical check, throwing AND into the mix can make things confusing and a lot harder to read.

stackoverflow.com › questions › 73720470 › precedence-of-cast-operators-in-php

Precedence of cast operators in php - Stack Overflow

As your link https://www.php.net/manual/en/language.operators.precedence.php already explains, the table is ordered by precedence.

First, you've got in line 3 the type cast (https://www.php.net/manual/en/language.types.type-juggling.php#language.types.typecasting), than the 6th line (arithmetic operators).

Your code is equivalent to

Copy$x = ((float)'100') / 100;

or

Copy$y = (float)'100';
$x = $y / 100;

respectively.

According to the table you linked to, type casting has higher precedence (row 3) than multiplication and division operators (row 6). So it's treated as

Copy$x = ((float)'100') / 100;

It first casts '100' to float, then performs the division.

reddit.com › r/phphelp › is the operator precedence of the null coalescing operator really right?

r/PHPhelp on Reddit: Is the operator precedence of the null coalescing operator really right?

November 22, 2020 -

Hi everyone,

According to the php documentation (https://www.php.net/manual/en/language.operators.precedence.php) the associativity of the null coalescing operator is right. Is that correct?

<?php

$foo = null;
$bar = null;
$baz = 1;
$qux = 2;

echo $foo ?? $bar ?? $baz ?? $qux; // outputs 1

?>

In this example it is solved from left to right, isn't it? Is the documentation incorrect or do I not understand associativity? Please help :-)

Left to right and short-circuiting so that if instead of ?? $qux, you would have ?? expensiveFunctionCall(), that function would not be executed since value to the left is not null. Can't do that in right associative semantics. Share your finding with documentation team, its a good find: https://github.com/php/doc-en

It is correct. Try to add parentheses around that expression. You will get echo ($foo ?? ($bar ?? ($baz ?? $qux))); And now you evaluate from right. First $baz and $qux. $baz is not null so return 1, and evaluation stops, because is not necessary to evaluate any further. You can say: return $qux if $baz is null.