douyong1886 2017-04-11 00:49
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php中的if(false)是什么意思?

Today, I decided to download wordpress and the first file that I have come across is wp-admin/install.php. the first thing in the file is this:

// Sanity check.
if ( false ) {
?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Error: PHP is not running</title>
</head>
<body class="wp-core-ui">
    <p id="logo"><a href="https://wordpress.org/">WordPress</a></p>
    <h1>Error: PHP is not running</h1>
    <p>WordPress requires that your web server is running PHP. Your server does not have PHP installed, or PHP is turned off.</p>
</body>
</html>
<?php
}

Now I am kind of wondering, What is if( false ) ? and how does it mean that the user is not running php on their server?

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  • dongzhenbi8919 2017-04-11 01:53
    关注

    If the PHP is running on the server, the statement inside if ( false ) will be skipped, because this equates to FALSE or its like if(0) .

    But in such cases that PHP compiler does not exist, the server will parse all html codes inside that statement ,(saying PHP is not running).

    It's a sanity check.

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