How to write ternary expression in php

In PHP, ternary expressions can implement simple conditional judgment functions. The writing method is "expression 1? expression 2: expression 3"; if the condition "expression 1" is established, the statement is executed "Expression 2", otherwise execute "Expression 3".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Ternary operation in php

Ternary operation can implement a simple conditional judgment function, that is, based on the result of the first expression, select one of the other two expressions and execute

Ternary operation expression The way of writing:

表达式1?表达式2:表达式3

means: if the condition "Expression 1" is true, execute the statement "Expression 2", otherwise execute the "Expression 3"

The sample code is as follows:

<?php
    $a = 10;
    $a % 2 == 0 ? print &#39;$a 是偶数！&#39; : print &#39;$a 是奇数！&#39;;
?>

The running results are as follows:

$a 是偶数！

In addition, Expression 2 and Expression 3 can also use single quotes ('') or double quotes ("") to omit any one of them to avoid unnecessary code, as shown below:

<?php
    $a = 10;
    $b = 7;
    $a % 2 == 0 ? print &#39;$a 是偶数！<br>&#39; : "";
    $b % 2 == 0 ? &#39;&#39; : print &#39;$b 是奇数！&#39;;
?>

The running result is as follows:

$a 是偶数！
$b 是奇数！

Note: When using ternary arithmetic, if you need to print a string, it is recommended to use the print statement instead of the echo statement.

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