Detailed explanation of php ternary operator examples

The ternary operator in php is also called the ternary operator. In fact, I often call it the question mark operator. In fact, it can be done like this. The ternary operator can implement simple conditional judgment functions. Let me explain. Let me introduce some examples of ternary operators

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The functions of the ternary operator are the same as "if ....else" process statement is consistent, it is written in one line, the code is concise and the execution efficiency is high. Proper use of the ternary operator in PHP programs can make scripts more concise and efficient. The syntax of the code is as follows:

(expr1)?(expr2):(expr3); //表达式1?表达式2:表达式3

Explanation:

If the condition "expr1" is true, execute the statement "expr2", otherwise execute "expr3".

<?PHP
$a=10; $b=20;
$c=$a>$b?($a-$b):($a+$b);
//说明：如果变量a大于变量b则执行问号后面的,否则就执行:冒号后面的
echo $c;
?>

Expressions can be functions, arrays, etc.

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In fact, the ternary operator can Extended use, when the set conditions are true or not, the execution statement can be more than one sentence. Try the following format:

(expr1) ? (expr2).(expr3) : (expr4).(expr5);

We can clearly see that multiple execution statements can use string operation symbols (". ") are connected, and each execution statement is surrounded by small angle brackets to indicate that it is an independent and complete execution statement. After this expansion, its function is closer to the "if...else" process statement.

At the same time, the ternary operator can also be used nested. For example, when a is greater than b: if a is less than c, then x=c-a otherwise x=a-c; otherwise when a is less than b: if b is less than c, then x=c-b otherwise x=b-c:

$a>$b ? $x=($a<$c ? $c-$a : $a-$c) : $x=($b<$c ? $c-$b : $b-$c);

The readability of the nested ternary operator is not very good, and there may be problems with maintaining the code in the future, so in this case we should just use if else if to implement it.

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