如何在Heredoc内部传递$ _POST变量

Question

我正在创建一些代码，这些代码将生成一个带有配置类的新页面。我使用了heredoc，如下所示。所以我想将$ _POST ['hostname']变量传递到Heredoc。我尝试了很多事情，但是没有运气。我该怎么办？

<?php
    if(isset($_POST['hostname'])) {
        $HOSTNAME = $_POST['hostname'];
    }

    if(isset($_POST['database'])) {
        $DATABASE = $_POST['database'];
    }

    if(isset($_POST['dbuser'])) {
        $USER = $_POST['dbuser'];
    }

    if(isset($_POST['dbuserpassword'])) {
        $PASSWORD = $_POST['dbuserpassword'];
    }

    $pardConfig = new PDO('mysql:host='.$HOSTNAME.';'.'dbname='.$DATABASE, $USER, $PASSWORD, array(
        PDO::ATTR_PERSISTENT => true
    ));

    if(isset($pardConfig)) {
        echo "connected";
    }

    $SQL =<<<'EOD'
    CREATE TABLE IF NOT EXISTS pard_host (
        host varchar(255) NOT NULL,
        db varchar(255),
        db_user varchar(255) NOT NULL,
        db_pass varchar(255)
    )
    EOD;

    $sq = $pardConfig->query($SQL);

    if ($sq) {
        echo 'created';
    }

    $stmt = $pardConfig->prepare("INSERT INTO pard_host (host, db, db_user, db_pass) VALUES (?, ?, ?, ?)");
    $stmt->bindParam(1, $HOSTNAME);
    $stmt->bindParam(2, $DATABASE);
    $stmt->bindParam(3, $USER);
    $stmt->bindParam(4, $PASSWORD);
    $stmt->execute();

    $PARD_CONFIGURATION_CLASS = <<<'EOT'

    class pardConfig {
        public $HOSTNAME = echo $DATABASE;;
        public $DATABASE = echo $DATABASE;
        public $USER      = echo $USER;
        public $PASSWORD = echo $PASSWORD;
    }
    EOT;

    $PARD_FILE_OPEN = fopen("configuration.php", "w+");
    fwrite($PARD_FILE_OPEN,$PARD_CONFIGURATION_CLASS );

?>

Answer 1

删除heredoc标识符周围的引号。

$PARD_CONFIGURATION_CLASS = <<<EOT

如果保留引号，则称为nowdoc。这就是php文档的用法：

Nowdocs是单引号字符串，heredocs是双引号字符串。 nowdoc的指定方式与Heredoc类似，但是nowdoc内部没有进行解析]

http://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.nowdoc

Answer 2

您的意思是：

$variable = "Test"; //Can be any variable; may be $_POST['name']
//Using '{' and '}' special characters in PHP strings.
$string = <<<HEREDOC
{$variable}
HEREDOC;

echo $string ;