What does && mean in php

The && operator in PHP is a logical AND operation, which combines two Boolean values ​​and returns true only when both values ​​are true, otherwise it returns false. Specifically, its truth table is as follows: Input 1 is true, input 2 is true: Output is true Input 1 is true, input 2 is false: Output is false Input 1 is false, input 2 is true: Output is false Input 1 is false, input 2 is false: Output is false

The meaning of && in PHP

PHP The && operator is a logical AND operator that combines two Boolean values ​​(true or false) and returns a result based on the logical relationship between the two values.

Logical AND operation

The logical AND operation returns true only if both input values ​​are true, otherwise it returns false. Specifically, the truth table for the && operator is as follows:

##TrueTrueTrue##Truefalsefalse

Input 1	Input 2	Output
False	false
true	false
false	false

Usage in PHP

In PHP, the && operator is used for combinations Multiple conditions to determine the true or false value of an overall condition. For example:

if ($age >= 18 && $has_driving_license) {
    // 允许驾驶
}

In the above example, the && operator joins two conditions: age >= 18 and has_driving_license. Only when both conditions are true, the overall condition will be true and the code in the if block will execute.

The difference between ||

The && operator in PHP is different from the || (logical OR) operator. The || operator returns true when at least one input value is true, while the && operator returns true only when both input values ​​are true.

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