Two unknown PHP operators

Today I will teach you two special operators, one is the ternary operator, and the other is an operator that can execute system commands. Let’s take a look below.

Ternary operator ? ：

Format:

表达式1 ? 表达式2 : 表达式3;

If the value of expression 1 is true, then execute expression 2, if the value of expression 1 is false, then Execute expression 3;

$a=true ? 14 : 43;
echo $a;//14

In the above case, we know that the value of expression 1 is true, so we execute expression 2 and the result of the operation is 14.

Special operators` `<br/>

This operator involves cross-platform operations and can put system commands into the PHP program in execution.

<?php
$a=`magnify`;
$b=`magnify`;
var_dump($b);
echo &#39;<br />&#39;;
echo $a;
?>

magnifyThere is a function to turn on the magnifying glass in the system command. When we execute this php file, we turn on the magnifying glass in the computer.

[Recommended learning: PHP video tutorial]

The above is the detailed content of Two unknown PHP operators. For more information, please follow other related articles on the PHP Chinese website!