What does += mean in php

In PHP, the = operator is used to add the value of a variable or expression to another variable. It works by adding the existing value of the variable to the value of the expression and storing it back into the variable. It is typically used for incrementing or accumulating values, but can only be used for numeric values, not strings or other data types.

= operator in PHP

= operator is used in PHP to change the value of a variable or expression added to another variable. The syntax is as follows:

<code class="php">$variable += expression;</code>

where:

• $variable is the variable to be updated.
• expression is the value to be added to the variable.

How it works

The = operator works by combining the existing value of $variable with expression## Add the values ​​of # and store the result back to $variable.

For example:

<code class="php">$num = 10;
$num += 5; // 等同于 $num = $num + 5
echo $num; // 输出 15</code>

Usage

The = operator is typically used to increment or accumulate values. It simplifies the following code:

<code class="php">// 使用 += 运算符
$count += 1;

// 相当于
$count = $count + 1;</code>

Note

• $variable must be an existing variable, otherwise an error will be generated .
• expression can be any valid PHP expression.
= operator can only be used on numeric values, not strings or other data types.

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