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For some fixed quantities in php, we often use constants to store them, so how to define constants? How to judge after defining it? This article will take you to take a look.
1. Use define to define a constant
<?php
define ("PATH","/zend/php/define.php");
echo PATH;
?>2. Use defined to determine whether the constant exists
<?php
define ("PATH","/zend/php/define.php");
echo PATH."<br>";
if(defined('PATH')){
echo 'PATH'."存在";
}
?>输出：/zend/php/define.php
PATH存在Recommended: 《2021 PHP interview questions summary (collection)》《php video tutorial》
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