通过fwrite向输出文件添加换行符 - Adding line breaks to output file via fwrite

Adding line breaks to output file via fwrite

我正在尝试格式化下面创建的文件，以便每个名称/值对都在自己的行上

我相信这很容易，但我的.ini文件根本没有格式化换行符。我错过了什么？

function wpseTest()
{
    $query = "SELECT option_name, option_value FROM wp_options where option_name like 'test|_%' escape '|' AND option_value > ''";
    global $wpdb;
    $matches = $wpdb->get_results($query);
    $mySettings = '[settings]'r'n';
    foreach ($matches as $result){
        $mySettings .= $result->option_name;
        $mySettings .= ' = ';
        $mySettings .= $result->option_value;
        $mySettings .= ''r'n';
    }
    $mySettingsFileLocation = WP_PLUGIN_DIR.'/test/settings-backup.ini';
    $mySettingsFile = fopen($mySettingsFileLocation, 'w');
    fwrite($mySettingsFile, $mySettings);
    fclose($mySettingsFile);
}

像'r和'n这样的特殊字符不会用单引号来解释。请改用双引号。

$mySettings = "[settings]'r'n";

和

$mySettings .= "'r'n";

您可以使用依赖于平台的常量PHP_EOL来代替

$mySettings = '[settings]' . PHP_EOL;
// ..
$mySettings .= PHP_EOL;

// Outputs: This will not expand: 'n a newline
echo 'This will not expand: 'n a newline';

用双引号

function wpseTest()
{
    $query = "SELECT option_name, option_value FROM wp_options where option_name like 'test|_%' escape '|' AND option_value > ''";
    global $wpdb;
    $matches = $wpdb->get_results($query);
    $mySettings = "[settings]'r'n";
    foreach ($matches as $result){
        $mySettings .= $result->option_name;
        $mySettings .= ' = ';
        $mySettings .= $result->option_value;
        $mySettings .= "'r'n";
    }
    $mySettingsFileLocation = WP_PLUGIN_DIR.'/test/settings-backup.ini';
    $mySettingsFile = fopen($mySettingsFileLocation, 'w');
    fwrite($mySettingsFile, $mySettings);
    fclose($mySettingsFile);
}