清理

    示例 #1 清理和验证电子邮件地址

    <?php
    $a     = 'joe@example.org';
    $b = 'bogus - at - example dot org';
    $c = '(bogus@example.org)';

    $sanitized_a = filter_var($a, FILTER_SANITIZE_EMAIL);
    if (    filter_var($sanitized_a, FILTER_VALIDATE_EMAIL)) {
    echo     "This (a) sanitized email address is considered valid.\n";
    }

    $sanitized_b = filter_var($b, FILTER_SANITIZE_EMAIL);
    if (    filter_var($sanitized_b, FILTER_VALIDATE_EMAIL)) {
    echo     "This sanitized email address is considered valid.";
    } else {
    echo     "This (b) sanitized email address is considered invalid.\n";
    }

    $sanitized_c = filter_var($c, FILTER_SANITIZE_EMAIL);
    if (    filter_var($sanitized_c, FILTER_VALIDATE_EMAIL)) {
    echo     "This (c) sanitized email address is considered valid.\n";
    echo     "Before: $c\n";
    echo     "After: $sanitized_c\n";
    }
    ?>

    以上示例会输出：

     This (a) sanitized email address is considered valid. This (b) sanitized email address is considered invalid. This (c) sanitized email address is considered valid. Before: (bogus@example.org) After: bogus@example.org

    示例 #2 配置默认过滤器

    filter.default = full_special_chars
    filter.default_flags = 0
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