What does php module equal mean?

php modulo equal refers to "%=", which is an extended assignment operator, meaning that the modulo operation is first performed, and then the result is assigned to the variable on the left side of the operator; the syntax is "x %= y", the equivalent form is "x = x % y". The extended assignment operator combines = with other operators (including arithmetic operators, bitwise operators and logical operators) to expand it into a more powerful assignment operator; the expanded assignment operator will make the assignment expression Writing is more elegant and convenient.

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

In php, module equals refers to " %=" is a type of extended assignment operator.

The "%=" operator can perform a modulo operation first, and then assign the result to the variable on the left side of the operator.

Syntax:

x %= y

This is equivalent to:

x = x % y

Example:

<?php
$k1=15;
$k1 %= 4;
echo $k1."<br/>"; // 输出 3

$k2=15;
$k2 %= 2;
echo $k2."<br/>"; // 输出 1
?>

Extended knowledge: PHP assignment operator

The assignment operator is used to transfer the value on the right to the variable (or constant) on the left; you can directly transfer the value on the right The value can be transferred to the variable on the left, or it can be transferred to the variable on the left after performing certain operations, such as addition, subtraction, multiplication, division, function calls, logical operations, etc.

The most basic assignment operator in PHP is the equal sign =; combined with other operators, = can also be extended to more powerful assignment operators.

Basic assignment operator

= is the most common and basic assignment operator in PHP, used to assign the value of an expression to Assign to another variable, please see the following example:

<?php
$a=20;
echo $a."<br/>"; // 输出 20

Expanded assignment operator

= can also be used with other operators (including arithmetic operators, bit operators and logical operators) are combined and expanded into a more powerful assignment operator, as shown in Table 1. The expanded assignment operator will make assignment expressions more elegant and convenient to write.

##**=Power assignmentx **= yx = x ** y//=Take integer assignmentx //= yx = x // y&=Bitwise AND assignmentx &= yx = x & y|=Bitwise OR assignmentx |= yx = x | y^=Bitwise XOR assignmentx ^= yx = x ^ y< ;Left shift assignmentx x = x >>=Right shift assignmentx >>= yx = x >> y, where y refers to the number of digits to shift to the right

Table 1 Python extended assignment operators

Operator	Description	Usage example	Equivalent form
=	The most basic assignment operation	x = y	x = y
=	Add assignment	x = y	x = x y
-=	Subtractive assignment	x -= y	x = x - y
*=	Multiply assignment	x *= y	x = x * y
/=	Division assignment	x /= y	x = x / y
%=	Take the remainder and assign the value	x %= y	x = x % y

Here is a simple example:

<?php
$z=50;
$z -= 25;
echo $z."<br/>"; // 输出 25
 
$i=5;
$i *= 5;
echo $i."<br/>"; // 输出 25
 
$j=10;
$j /= 5;
echo $j."<br/>"; // 输出 2
 
$k=15;
$k %= 4;
echo $k."<br/>"; // 输出 3
?>

Normally, as long as the extended assignment operator can be used, it is recommended to use this assignment operator.

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