Conditional statements written with && php - three types of conditional statements

First type: IF conditional statement

Second type: ternary operation

Third type: conditional statement composed of && and ||

First type: IF Needless to say, this is the basis, I believe most of them Everyone knows it;

Second type: c=a>b ? true:false //Means: If a>b is true, return true, otherwise return false (of course it can be replaced with a statement), and return the result to c ;

Third type: 1, &&

In most languages, he means and meaning, that is, the left and right sides are true, using PHP as an example, traditional use in tradition;

if ($a>0 && $b>0){ 
     //语句； 
}

Execute the statement when both are true;

However, today we are going to use it as a conditional statement; for example, there is a traditional conditional statement below:

if ($a>0){

$b ='This is test';

}

When the condition is true, the statements in it will be executed; but it is too troublesome to write like this. We can write directly like this:

$a>0 && ($b='This is test');

The computer will first determine whether $a is true. If so, the following statements will be executed. If not, there is no need to execute the following statements;

Benefits: 1. Can be written in one line

2, omitting code;

2, ||

&& can write conditional statements like this, then || Of course, it is also possible, but his execution order is different.

$a>0 || ($b='This is test');

The computer first determines whether $a >0 is true, yes: the following statements will not be executed, no: they will be executed;

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The above introduces the three conditional statements written in && PHP, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.